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Jordan CE, Anderson BE, Barrick JD, Blum D, Brunke K, Chai J, Chen G, Crosbie EC, Dibb JE, Dillner AM, Gargulinski E, Hudgins CH, Joyce E, Kaspari J, Martin RF, Moore RH, O’Brien R, Robinson CE, Schuster GL, Shingler TJ, Shook MA, Soja AJ, Thornhill KL, Weakley AT, Wiggins EB, Winstead EL, Ziemba LD. Beyond the Ångström Exponent: Probing Additional Information in Spectral Curvature and Variability of In Situ Aerosol Hyperspectral (0.3-0.7 μm) Optical Properties. JOURNAL OF GEOPHYSICAL RESEARCH. ATMOSPHERES : JGR 2022; 127:e2022JD037201. [PMID: 36590057 PMCID: PMC9787633 DOI: 10.1029/2022jd037201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 08/31/2022] [Accepted: 10/14/2022] [Indexed: 06/17/2023]
Abstract
Ångström exponents (α) allow reconstruction of aerosol optical spectra over a broad range of wavelengths from measurements at two or more wavelengths. Hyperspectral measurements of atmospheric aerosols provide opportunities to probe measured spectra for information inaccessible from only a few wavelengths. Four sets of hyperspectral in situ aerosol optical coefficients (aerosol-phase total extinction, σ ext, and absorption, σ abs; liquid-phase soluble absorption from methanol, σ MeOH-abs, and water, σ DI-abs, extracts) were measured from biomass burning aerosols (BBAs). Hyperspectral single scattering albedo (ω), calculated from σ ext and σ abs, provide spectral resolution over a wide spectral range rare for this optical parameter. Observed spectral shifts between σ abs and σ MeOH-abs/σ DI-abs argue in favor of measuring σ abs rather than reconstructing it from liquid extracts. Logarithmically transformed spectra exhibited curvature better fit by second-order polynomials than linear α. Mapping second order fit coefficients (a 1, a 2) revealed samples from a given fire tended to cluster together, that is, aerosol spectra from a given fire were similar to each other and somewhat distinct from others. Separation in (a 1, a 2) space for spectra with the same α suggest additional information in second-order parameterization absent from the linear fit. Spectral features found in the fit residuals indicate more information in the measured spectra than captured by the fits. Above-detection σ MeOH-abs at 0.7 μm suggests assuming all absorption at long visible wavelengths is BC to partition absorption between BC and brown carbon (BrC) overestimates BC and underestimates BrC across the spectral range. Hyperspectral measurements may eventually discriminate BBA among fires in different ecosystems under variable conditions.
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Affiliation(s)
- Carolyn E. Jordan
- National Institute of AerospaceHamptonVAUSA
- NASA Langley Research CenterHamptonVAUSA
| | | | - John D. Barrick
- NASA Langley Research CenterHamptonVAUSA
- Science Systems and Applications Inc.HamptonVAUSA
| | | | | | | | - Gao Chen
- NASA Langley Research CenterHamptonVAUSA
| | - Ewan C. Crosbie
- NASA Langley Research CenterHamptonVAUSA
- Science Systems and Applications Inc.HamptonVAUSA
| | | | | | - Emily Gargulinski
- National Institute of AerospaceHamptonVAUSA
- NASA Langley Research CenterHamptonVAUSA
| | - Charles H. Hudgins
- NASA Langley Research CenterHamptonVAUSA
- Science Systems and Applications Inc.HamptonVAUSA
| | | | | | | | | | | | - Claire E. Robinson
- NASA Langley Research CenterHamptonVAUSA
- Science Systems and Applications Inc.HamptonVAUSA
- William & MaryWilliamsburgVAUSA
| | | | | | | | - Amber J. Soja
- National Institute of AerospaceHamptonVAUSA
- NASA Langley Research CenterHamptonVAUSA
| | - Kenneth L. Thornhill
- NASA Langley Research CenterHamptonVAUSA
- Science Systems and Applications Inc.HamptonVAUSA
| | | | | | - Edward L. Winstead
- NASA Langley Research CenterHamptonVAUSA
- Science Systems and Applications Inc.HamptonVAUSA
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Spectral Derivatives of Optical Depth for Partitioning Aerosol Type and Loading. REMOTE SENSING 2021. [DOI: 10.3390/rs13081544] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Quantifying aerosol compositions (e.g., type, loading) from remotely sensed measurements by spaceborne, suborbital and ground-based platforms is a challenging task. In this study, the first and second-order spectral derivatives of aerosol optical depth (AOD) with respect to wavelength are explored to determine the partitions of the major components of aerosols based on the spectral dependence of their particle optical size and complex refractive index. With theoretical simulations from the Second Simulation of a Satellite Signal in the Solar Spectrum (6S) model, AOD spectral derivatives are characterized for collective models of aerosol types, such as mineral dust (DS) particles, biomass-burning (BB) aerosols and anthropogenic pollutants (AP), as well as stretching out to the mixtures among them. Based on the intrinsic values from normalized spectral derivatives, referenced as the Normalized Derivative Aerosol Index (NDAI), a unique pattern is clearly exhibited for bounding the major aerosol components; in turn, fractions of the total AOD (fAOD) for major aerosol components can be extracted. The subtlety of this NDAI method is examined by using measurements of typical aerosol cases identified carefully by the ground-based Aerosol Robotic Network (AERONET) sun–sky spectroradiometer. The results may be highly practicable for quantifying fAOD among mixed-type aerosols by means of the normalized AOD spectral derivatives.
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Characterization of Stratospheric Smoke Particles over the Antarctica by Remote Sensing Instruments. REMOTE SENSING 2020. [DOI: 10.3390/rs12223769] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Australian smoke from the extraordinary biomass burning in December 2019 was observed over Marambio, Antarctica from the 7th to the 10th January, 2020. The smoke plume was transported thousands of kilometers over the Pacific Ocean, and reached the Antarctic Peninsula at a hight of 13 km, as determined by satellite lidar observations. The proposed origin and trajectory of the aerosol are supported by back-trajectory model analyses. Ground-based Sun–Sky–Moon photometer belonging to the Aerosol Robotic Network (AERONET) measured aerosol optical depth (500 nm wavelength) above 0.3, which is unprecedented for the site. Inversion of sky radiances provide the optical and microphysical properties of the smoke over Marambio. The AERONET data near the fire origin in Tumbarumba, Australia, was used to investigate the changes in the measured aerosol properties after transport and ageing. The analysis shows an increase in the fine mode particle radius and a reduction in absorption (increase in the single scattering albedo). The available long-term AOD data series at Marambio suggests that smoke particles could have remained over Antarctica for several weeks after the analyzed event.
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Rupakheti D, Rupakheti M, Abdullaev SF, Yin X, Kang S. Columnar aerosol properties and radiative effects over Dushanbe, Tajikistan in Central Asia. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 265:114872. [PMID: 32497948 DOI: 10.1016/j.envpol.2020.114872] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 05/14/2020] [Accepted: 05/22/2020] [Indexed: 06/11/2023]
Abstract
This paper presents the results of the study on columnar aerosol optical and physical properties and radiative effects directly observed over Dushanbe, the capital city of Tajikistan, a NASA AERONET site (equipped with a CIMEL sunphotometer) in Central Asia. The average aerosol optical depth (AOD) and Ångström exponent (AE) during the observation period from July 2010 to April 2018 were found to be 0.28 ± 0.20 and 0.82 ± 0.40, respectively. The highest seasonal AOD (0.32 ± 0.24), accompanied by the lowest average AE (0.61 ± 0.25) and fine-mode fraction in AOD (0.39), was observed during summer due to the influence of coarse particles like dust from arid regions. Fine particles were found in significant amounts during winter. The 'mixed aerosol' was identified as the dominant aerosol type with presence of 'dust aerosol' during summer and autumn seasons. Aerosol properties like volume size distribution, single scattering albedo, asymmetry parameter and refractive index suggested the influence of coarse particles (during summer and autumn). Most of the air masses reaching this site transported local and regional emissions, including from beyond Central Asia, explaining the presence of various aerosol types in Dushanbe's atmosphere. The seasonal aerosol radiative forcing efficiency (ARFE) in the atmosphere was found high (>100 Wm-2) and consistent throughout the year. Consequently, this resulted in similar seasonally coherent high atmospheric solar heating rate (HR) of 1.5 K day-1 during summer-autumn-winter, and ca. 0.9 K day-1 during spring season. High ARFE and HR values indicate that atmospheric aerosols could exert significant implications to regional air quality, climate and cryosphere over the central Asian region and downwind Tianshan and Himalaya-Tibetan Plateau mountain regions with sensitive ecosystems.
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Affiliation(s)
- Dipesh Rupakheti
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
| | | | - Sabur F Abdullaev
- Physical Technical Institute of the Academy of Sciences of Tajikistan, Dushanbe, Tajikistan
| | - Xiufeng Yin
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Shichang Kang
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China.
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An Investigation of Vertically Distributed Aerosol Optical Properties over Pakistan Using CALIPSO Satellite Data. REMOTE SENSING 2020. [DOI: 10.3390/rs12142183] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The vertically distributed aerosol optical properties are investigated over Pakistan utilizing the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) Level 2 products from 2007 to 2014. For a better understanding of the spatiotemporal characteristics of vertical aerosol layers, the interannual and seasonal variations of nine selected aerosol parameters such as the AOD of the lowest aerosol layer (AODL), the base height of the lowest aerosol layer (HL), the top height of the highest aerosol layer (HH), the volume depolarization ratio of the lowest aerosol layer (DRL), the color ratio of the lowest aerosol layer (CRL), total AOD of all the aerosol layers (AODT), the number of aerosol feature layers (N), the thickness of the lowest aerosol layer (TL), the AOD proportion for the lowest aerosol layer (PAODL) for both day and night times are analyzed. The results show AODT increased slightly from 2007 to 2014 over Pakistan, and relatively high AODT exists over the Punjab and Sindh (southern region), which might be owing to the high level of economic development, frequent dust storms, and profound agricultural activities (anthropogenic emissions). AODT increases from north to south. The reason may be that the southern region is rapidly urbanized and is near the desert. The northern region is dominated by agricultural land, and cities are usually semi-urbanized. The highest AODT appears in summer compared to the other seasons, and during daytime compared to nighttime. The HL and HH vary significantly, owing to the topography of Pakistan. The N is relatively large over Punjab and Sindh compared to the other regions, which might be caused by relatively stronger atmospheric convections. The spatial distribution of the TL showed an inverse relationship with the topography as lower values are observed over elevated regions such as Gilgit-Baltistan and Jammu-Kashmir. The value of the PAODL indicates that 77% of the total aerosols are mainly concentrated in the lowest layer of the atmosphere over Pakistan. The higher values of DRL and CRL indicate non-spherical and large particles over Balochistan and Sindh, which might be related to the proximity to the desert. This study provides very useful information about vertically distributed aerosol optical properties which could help researchers and policymakers to regulate and mitigate air pollution issues of Pakistan.
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Study of Chemical and Optical Properties of Biomass Burning Aerosols during Long-Range Transport Events toward the Arctic in Summer 2017. ATMOSPHERE 2020. [DOI: 10.3390/atmos11010084] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Biomass burning related aerosol episodes are becoming a serious threat to the radiative balance of the Arctic region. Since early July 2017 intense wildfires were recorded between August and September in Canada and Greenland, covering an area up to 4674 km2 in size. This paper describes the impact of these biomass burning (BB) events measured over Svalbard, using an ensemble of ground-based, columnar, and vertically-resolved techniques. BB influenced the aerosol chemistry via nitrates and oxalates, which exhibited an increase in their concentrations in all of size fractions, indicating the BB origin of particles. The absorption coefficient data (530 nm) at ground reached values up to 0.6 Mm–1, highlighting the impact of these BB events when compared to average Arctic background values, which do not exceed 0.05 Mm–1. The absorption behavior is fundamental as implies a subsequent atmospheric heating. At the same time, the AERONET Aerosol Optical Depth (AOD) data showed high values at stations located close to or in Canada (AOD over 2.0). Similarly, increased values of AODs were then observed in Svalbard, e.g., in Hornsund (daily average AODs exceeded 0.14 and reached hourly values up to 0.5). Elevated values of AODs were then registered in Sodankylä and Andenes (daily average AODs exceeding 0.150) a few days after the Svalbard observation of the event highlighting the BB columnar magnitude, which is crucial for the radiative impact. All the reported data suggest to rank the summer 2017 plume of aerosols as one of the biggest atmosphere related environmental problems over Svalbard region in last 10 years.
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Long-Term Aerosol Trends and Variability over Central Saudi Arabia Using Optical Characteristics from Solar Village AERONET Measurements. ATMOSPHERE 2019. [DOI: 10.3390/atmos10120752] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Natural and anthropogenic aerosols over the Kingdom of Saudi Arabia (KSA) play a major role in affecting the regional radiation budget. The long-term variability of these aerosols’ physical and optical parameters, including aerosol optical depth (AOD) and Ångström exponent (α), were measured at a location near central KSA using the Solar Village (SV) AERONET (Aerosol Robotic Network) station during the period December 1999–January 2013. The AERONET measurements show an overall increase in AOD on an annual basis. This upward trend is mainly attributed to a prolonged increase in the monthly/seasonal mean AOD during March–June and during August–September. In contrast, lower AOD values were observed during November–December. This can be attributed to a low frequency of dust outbreaks and higher precipitation rates. An overall, weak declining trend in α was observed, except during the summer. The spring and summer seasons experienced a pronounced increase in the number of coarse particles (~2 µm) during April 2006–January 2013 as compared to December 1999–March 2006, suggesting an increase in natural aerosol loadings. Using the HYSPLIT model, it was found that the March 2009 dust storm contributed to the mixing of long-transported dust with anthropogenic local emissions near the SV. The results suggest that extensive industrial activity contributed to the increase of anthropogenic emissions over KSA during the period April 2006–January 2013.
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Thomas A, Sarangi C, Kanawade VP. Recent Increase in Winter Hazy Days over Central India and the Arabian Sea. Sci Rep 2019; 9:17406. [PMID: 31758012 PMCID: PMC6874585 DOI: 10.1038/s41598-019-53630-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 10/29/2019] [Indexed: 11/15/2022] Open
Abstract
Indian subcontinent is greatly vulnerable to air pollution, especially during the winter season. Here, we use 15 years (2003-2017) of satellite and model reanalysis datasets over India and adjoining Seas to estimate the trend in hazy days (i.e. days with high aerosol loading) during the dry winter season (November to February). The number of hazy days is increasing at the rate of ~2.6 days per year over Central India. Interestingly, this is higher than over the Indo-Gangetic Plain (~1.7 days/year), a well known global hotspot of particulate pollution. Consistent increasing trends in absorbing aerosols are also visible in the recent years. As a result, the estimated atmospheric warming trends over Central India are two-fold higher than that over Indo-Gangetic Plain. This anomalous increment in hazy days over Central India is associated with the relatively higher increase in biomass burning over the region. Moreover, the trend in aerosol loading over the Arabian Sea, which is located downwind to Central India, is also higher than that over the Bay of Bengal during the dry winter season. Our findings not only draw attention to the rapid deteriorating air quality over Central India, but also underline the significance of increasing biomass burning under the recent climate change.
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Affiliation(s)
- Abin Thomas
- Centre for Earth, Ocean and Atmospheric Sciences, University of Hyderabad, Hyderabad, Telangana, 500046, India
| | - Chandan Sarangi
- Pacific Northwest National Laboratory, Richland, Washington, 99352, USA.
| | - Vijay P Kanawade
- Centre for Earth, Ocean and Atmospheric Sciences, University of Hyderabad, Hyderabad, Telangana, 500046, India.
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Eck TF, Holben BN, Reid JS, Xian P, Giles DM, Sinyuk A, Smirnov A, Schafer JS, Slutsker I, Kim J, Koo JH, Choi M, Kim KC, Sano I, Arola A, Sayer AM, Levy RC, Munchak LA, O'Neill NT, Lyapustin A, Hsu NC, Randles CA, Da Silva AM, Buchard V, Govindaraju RC, Hyer E, Crawford JH, Wang P, Xia X. Observations of the Interaction and Transport of Fine Mode Aerosols with Cloud and/or Fog in Northeast Asia from Aerosol Robotic Network (AERONET) and Satellite Remote Sensing. JOURNAL OF GEOPHYSICAL RESEARCH. ATMOSPHERES : JGR 2018; 123:5560-5587. [PMID: 32661496 PMCID: PMC7356674 DOI: 10.1029/2018jd028313] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 04/26/2018] [Indexed: 06/10/2023]
Abstract
Analysis of sun photometer measured and satellite retrieved aerosol optical depth (AOD) data has shown that major aerosol pollution events with very high fine mode AOD (>1.0 in mid-visible) in the China/Korea/Japan region are often observed to be associated with significant cloud cover. This makes remote sensing of these events difficult even for high temporal resolution sun photometer measurements. Possible physical mechanisms for these events that have high AOD include a combination of aerosol humidification, cloud processing, and meteorological co-variation with atmospheric stability and convergence. The new development of Aerosol Robotic network (AERONET) Version 3 Level 2 AOD with improved cloud screening algorithms now allow for unprecedented ability to monitor these extreme fine mode pollution events. Further, the Spectral Deconvolution Algorithm (SDA) applied to Level 1 data (L1; no cloud screening) provides an even more comprehensive assessment of fine mode AOD than L2 in current and previous data versions. Studying the 2012 winter-summer period, comparisons of AERONET L1 SDA daily average fine mode AOD data showed that Moderate Resolution Imaging Spectroradiometer (MODIS) satellite remote sensing of AOD often did not retrieve and/or identify some of the highest fine mode AOD events in this region. Also, compared to models that include data assimilation of satellite retrieved AOD, the L1 SDA fine mode AOD was significantly higher in magnitude, particularly for the highest AOD events that were often associated with significant cloudiness.
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Affiliation(s)
- T F Eck
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
- Universities Space Research Association, Columbia, MD, USA
| | - B N Holben
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - J S Reid
- Naval Research Laboratory, Monterey, CA, USA
| | - P Xian
- Naval Research Laboratory, Monterey, CA, USA
| | - D M Giles
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
- Science Systems Applications, Inc., Lanham, MD, USA
| | - A Sinyuk
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
- Science Systems Applications, Inc., Lanham, MD, USA
| | - A Smirnov
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
- Science Systems Applications, Inc., Lanham, MD, USA
| | - J S Schafer
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
- Science Systems Applications, Inc., Lanham, MD, USA
| | - I Slutsker
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
- Science Systems Applications, Inc., Lanham, MD, USA
| | - J Kim
- Yonsei University, Seoul, South Korea
| | - J-H Koo
- Yonsei University, Seoul, South Korea
| | - M Choi
- Yonsei University, Seoul, South Korea
| | - K C Kim
- Gwangju Institute of Science and Technology, Gwangju, South Korea
| | - I Sano
- Kinki University, Osaka, Japan
| | - A Arola
- Finnish Meteorological Institute, Kuopio, Finland
| | - A M Sayer
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
- Universities Space Research Association, Columbia, MD, USA
| | - R C Levy
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - L A Munchak
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | | | - A Lyapustin
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - N C Hsu
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - C A Randles
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - A M Da Silva
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - V Buchard
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
- Universities Space Research Association, Columbia, MD, USA
| | - R C Govindaraju
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
- Science Systems Applications, Inc., Lanham, MD, USA
| | - E Hyer
- Naval Research Laboratory, Monterey, CA, USA
| | | | - P Wang
- LAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
| | - X Xia
- LAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
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Torres B, Dubovik O, Fuertes D, Schuster G, Cachorro VE, Lapyonok T, Goloub P, Blarel L, Barreto A, Mallet M, Toledano C, Tanré D. Advanced characterisation of aerosol size properties from measurements of spectral optical depth using the GRASP algorithm. ATMOSPHERIC MEASUREMENT TECHNIQUES 2017; 10:3743-3781. [PMID: 33505530 PMCID: PMC7837514 DOI: 10.5194/amt-10-3743-2017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
This study evaluates the potential of using aerosol optical depth (τ a) measurements to characterise the microphysical and optical properties of atmospheric aerosols. With this aim, we used the recently developed GRASP (Generalized Retrieval of Aerosol and Surface Properties) code for numerical testing of six different aerosol models with different aerosol loads. The direct numerical simulations (self-consistency tests) indicate that the GRASP-AOD retrieval provides modal aerosol optical depths (fine and coarse) to within 0.01 of the input values. The retrieval of the fine-mode radius, width and volume concentration are stable and precise if the real part of the refractive index is known. The coarse-mode properties are less accurate, but they are significantly improved when additional a priori information is available. The tests with random simulated errors show that the uncertainty in the bimodal log-normal size distribution parameters increases as the aerosol load decreases. Similarly, the reduction in the spectral range diminishes the stability of the retrieved parameters. In addition to these numerical studies, we used optical depth observations at eight AERONET locations to validate our results with the standard AERONET inversion products. We found that bimodal log-normal size distributions serve as useful input assumptions, especially when the measurements have inadequate spectral coverage and/or limited accuracy, such as moon photometry. Comparisons of the mode median radii between GRASP-AOD and AERONET indicate average differences of 0.013 μm for the fine mode and typical values of 0.2-0.3 μm for the coarse mode. The dominant mode (i.e. fine or coarse) indicates a 10 % difference in mode radii between the GRASP-AOD and AERONET inversions, and the average of the difference in volume concentration is around 17 % for both modes. The retrieved values of the fine-mode τ a(500) using GRASP-AOD are generally between those values obtained by the standard AERONET inversion and the values obtained by the AERONET spectral deconvolution algorithm (SDA), with differences typically lower than 0.02 between GRASP-AOD and both algorithms. Finally, we present some examples of application of GRASP-AOD inversion using moon photometry and the airborne PLASMA sun photometer during the ChArMEx summer 2013 campaign in the western Mediterranean.
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Affiliation(s)
- Benjamin Torres
- Laboratoire d’Optique Amosphérique, Université des Sciences et Technologies de Lille, Villeneuve d’Ascq, France
- GRASP-SAS, Remote sensing developments, Université des Sciences et Technologies de Lille, Villeneuve d’Ascq, France
| | - Oleg Dubovik
- Laboratoire d’Optique Amosphérique, Université des Sciences et Technologies de Lille, Villeneuve d’Ascq, France
| | - David Fuertes
- Laboratoire d’Optique Amosphérique, Université des Sciences et Technologies de Lille, Villeneuve d’Ascq, France
- GRASP-SAS, Remote sensing developments, Université des Sciences et Technologies de Lille, Villeneuve d’Ascq, France
| | | | | | - Tatsiana Lapyonok
- Laboratoire d’Optique Amosphérique, Université des Sciences et Technologies de Lille, Villeneuve d’Ascq, France
| | - Philippe Goloub
- Laboratoire d’Optique Amosphérique, Université des Sciences et Technologies de Lille, Villeneuve d’Ascq, France
| | - Luc Blarel
- Laboratoire d’Optique Amosphérique, Université des Sciences et Technologies de Lille, Villeneuve d’Ascq, France
| | - Africa Barreto
- Group of Atmospheric Optics, Valladolid University, Valladolid, Spain
- Cimel Electronique, Paris, France
- Izaña Atmospheric Research Center, Spanish Meteorological Agency, Tenerife, Spain
| | - Marc Mallet
- CNRM UMR 3589, Météo-France/CNRS, Toulouse, France
| | - Carlos Toledano
- Group of Atmospheric Optics, Valladolid University, Valladolid, Spain
| | - Didier Tanré
- Laboratoire d’Optique Amosphérique, Université des Sciences et Technologies de Lille, Villeneuve d’Ascq, France
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SAHARA: A Simplified AtmospHeric Correction AlgoRithm for Chinese gAofen Data: 1. Aerosol Algorithm. REMOTE SENSING 2017. [DOI: 10.3390/rs9030253] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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12
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Che H, Xia X, Zhu J, Wang H, Wang Y, Sun J, Zhang X, Shi G. Aerosol optical properties under the condition of heavy haze over an urban site of Beijing, China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:1043-1053. [PMID: 25106521 DOI: 10.1007/s11356-014-3415-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2014] [Accepted: 08/04/2014] [Indexed: 06/03/2023]
Abstract
In January 2013, several serious haze pollution events happened in North China. Cimel sunphotometer measurements at an urban site of Beijing (Chinese Academy of Meteorological Sciences-CAMS) from 1 to 30 January 2013 were used to investigate the detailed variation of aerosol optical properties. It was found that Angstrom exponents were mostly larger than 0.80 when aerosol optical depth values are higher than 0.60 at the urban region of Beijing during January 2013. The aerosol optical depth (AOD) at the urban region of Beijing can remain steady at approximately 0.40 before haze happening and then increased sharply to more than 1.50 at 500 nm with the onset of haze, which suggests that the fine-mode AOD is a factor of 20 of the coarse-mode AOD during a serious haze pollution event. The single scattering albedo was approximately 0.90 ± 0.03 at 440, 675, 870 and 1,020 nm during the haze pollution period. The single scattering albedo at 440 nm as a function of the fine-mode fraction was relatively consistent, but it was highly variable at 675, 870 and 1,020 nm. Except on January 12 and 18, all the fine-mode particle volumes were larger than those of coarse particles, which suggests that fine particles from anthropogenic activities made up most of the haze. Aerosol type classification analysis showed that the dominant aerosol types can be classified as both "mixed" and "urban/industrial (U/I) and biomass burning (BB)" categories during the heavy haze period of Beijing in January of 2013. The mixed category occurrence was about 31 %, while the U/I and BB was about 69 %.
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Affiliation(s)
- Huizheng Che
- Key Laboratory of Atmospheric Chemistry (LAC), Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences (CAMS), CMA, 46 Zhong-Guan-Cun S. Ave., Beijing, 100081, China,
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Lin NH, Sayer AM, Wang SH, Loftus AM, Hsiao TC, Sheu GR, Hsu NC, Tsay SC, Chantara S. Interactions between biomass-burning aerosols and clouds over Southeast Asia: current status, challenges, and perspectives. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2014; 195:292-307. [PMID: 25085565 DOI: 10.1016/j.envpol.2014.06.036] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Revised: 06/08/2014] [Accepted: 06/28/2014] [Indexed: 06/03/2023]
Abstract
The interactions between aerosols, clouds, and precipitation remain among the largest sources of uncertainty in the Earth's energy budget. Biomass-burning aerosols are a key feature of the global aerosol system, with significant annually-repeating fires in several parts of the world, including Southeast Asia (SEA). SEA in particular provides a "natural laboratory" for these studies, as smoke travels from source regions downwind in which it is coupled to persistent stratocumulus decks. However, SEA has been under-exploited for these studies. This review summarizes previous related field campaigns in SEA, with a focus on the ongoing Seven South East Asian Studies (7-SEAS) and results from the most recent BASELInE deployment. Progress from remote sensing and modeling studies, along with the challenges faced for these studies, are also discussed. We suggest that improvements to our knowledge of these aerosol/cloud effects require the synergistic use of field measurements with remote sensing and modeling tools.
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Affiliation(s)
- Neng-Huei Lin
- Department of Atmospheric Sciences, National Central University, Chung-Li, Taiwan; Chemistry Department and Environmental Science Program, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand.
| | - Andrew M Sayer
- Goddard Space Flight Center, NASA, Greenbelt, MD, USA; Universities Space Research Association, Columbia, MD, USA
| | - Sheng-Hsiang Wang
- Department of Atmospheric Sciences, National Central University, Chung-Li, Taiwan
| | - Adrian M Loftus
- Goddard Space Flight Center, NASA, Greenbelt, MD, USA; Oak Ridge Associated Universities, Oak Ridge, TN, USA
| | - Ta-Chih Hsiao
- Graduate Institute of Environmental Engineering, National Central University, Chung-Li, Taiwan
| | - Guey-Rong Sheu
- Department of Atmospheric Sciences, National Central University, Chung-Li, Taiwan
| | | | - Si-Chee Tsay
- Goddard Space Flight Center, NASA, Greenbelt, MD, USA
| | - Somporn Chantara
- Chemistry Department and Environmental Science Program, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
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14
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Aerosol Optical Properties of a Haze Episode in Wuhan Based on Ground-Based and Satellite Observations. ATMOSPHERE 2014. [DOI: 10.3390/atmos5040699] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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15
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Eck TF, Holben BN, Reid JS, Giles DM, Rivas MA, Singh RP, Tripathi SN, Bruegge CJ, Platnick S, Arnold GT, Krotkov NA, Carn SA, Sinyuk A, Dubovik O, Arola A, Schafer JS, Artaxo P, Smirnov A, Chen H, Goloub P. Fog- and cloud-induced aerosol modification observed by the Aerosol Robotic Network (AERONET). ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jd016839] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Janjai S, Nunez M, Masiri I, Wattan R, Buntoung S, Jantarach T, Promsen W. Aerosol Optical Properties at Four Sites in Thailand. ACTA ACUST UNITED AC 2012. [DOI: 10.4236/acs.2012.24038] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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17
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Tesfaye M, Sivakumar V, Botai J, Mengistu Tsidu G. Aerosol climatology over South Africa based on 10 years of Multiangle Imaging Spectroradiometer (MISR) data. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2011jd016023] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Noh YM, Müller D, Mattis I, Lee H, Kim YJ. Vertically resolved light-absorption characteristics and the influence of relative humidity on particle properties: Multiwavelength Raman lidar observations of East Asian aerosol types over Korea. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2010jd014873] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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19
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Eck TF, Holben BN, Sinyuk A, Pinker RT, Goloub P, Chen H, Chatenet B, Li Z, Singh RP, Tripathi SN, Reid JS, Giles DM, Dubovik O, O'Neill NT, Smirnov A, Wang P, Xia X. Climatological aspects of the optical properties of fine/coarse mode aerosol mixtures. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2010jd014002] [Citation(s) in RCA: 281] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Kalapureddy MCR, Kaskaoutis DG, Ernest Raj P, Devara PCS, Kambezidis HD, Kosmopoulos PG, Nastos PT. Identification of aerosol type over the Arabian Sea in the premonsoon season during the Integrated Campaign for Aerosols, Gases and Radiation Budget (ICARB). ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2009jd011826] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Eck TF, Holben BN, Reid JS, Sinyuk A, Hyer EJ, O'Neill NT, Shaw GE, Vande Castle JR, Chapin FS, Dubovik O, Smirnov A, Vermote E, Schafer JS, Giles D, Slutsker I, Sorokine M, Newcomb WW. Optical properties of boreal region biomass burning aerosols in central Alaska and seasonal variation of aerosol optical depth at an Arctic coastal site. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jd010870] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Salinas SV, Chew BN, Liew SC. Retrievals of aerosol optical depth and Angström exponent from ground-based Sun-photometer data of Singapore. APPLIED OPTICS 2009; 48:1473-1484. [PMID: 19277079 DOI: 10.1364/ao.48.001473] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The role of aerosols in climate and climate change is one of the factors that is least understood at the present. Aerosols' direct interaction with solar radiation is a well understood mechanism that affects Earth's net radiative forcing. However, quantifying its magnitude is more problematic because of the temporal and spatial variability of aerosol particles. To enhance our understanding of the radiative effects of aerosols on the global climate, Singapore has joined the AERONET (Aerosol Robotic Network) worldwide network by contributing ground-based direct Sun measurements performed by means of a multiwavelength Sun-photometer instrument. Data are collected on an hourly basis, then are uploaded to be fully screened and quality assured by AERONET. We use a one year data record (level 1.5/2.0) of measured columnar atmospheric optical depth, spanning from November 2006 to October 2007, to study the monthly and seasonal variability of the aerosol optical depth and the Angström exponent. We performed independent retrievals of these parameters (aerosol optical depth and Angström exponent) by using the photometer's six available bands covering the near-UV to near-IR (380-1080 nm). As a validation, our independent retrievals were compared with AERONET 1.5/2.0 level direct Sun product.
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Affiliation(s)
- Santo V Salinas
- Centre for Remote Imaging, Sensing and Processing, National University of Singapore, Singapore.
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23
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Mallet M, Pont V, Liousse C, Gomes L, Pelon J, Osborne S, Haywood J, Roger JC, Dubuisson P, Mariscal A, Thouret V, Goloub P. Aerosol direct radiative forcing over Djougou (northern Benin) during the African Monsoon Multidisciplinary Analysis dry season experiment (Special Observation Period-0). ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd009419] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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24
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Chand D, Anderson TL, Wood R, Charlson RJ, Hu Y, Liu Z, Vaughan M. Quantifying above-cloud aerosol using spaceborne lidar for improved understanding of cloudy-sky direct climate forcing. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd009433] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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Schafer JS, Eck TF, Holben BN, Artaxo P, Duarte AF. Characterization of the optical properties of atmospheric aerosols in Amazônia from long-term AERONET monitoring (1993–1995 and 1999–2006). ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd009319] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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26
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Kim D, Ramanathan V. Solar radiation budget and radiative forcing due to aerosols and clouds. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd008434] [Citation(s) in RCA: 148] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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27
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Eck TF, Holben BN, Reid JS, Sinyuk A, Dubovik O, Smirnov A, Giles D, O'Neill NT, Tsay SC, Ji Q, Al Mandoos A, Ramzan Khan M, Reid EA, Schafer JS, Sorokine M, Newcomb W, Slutsker I. Spatial and temporal variability of column-integrated aerosol optical properties in the southern Arabian Gulf and United Arab Emirates in summer. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd008944] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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28
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Badarinath KVS, Kharol SK, Kaskaoutis DG, Kambezidis HD. Case study of a dust storm over Hyderabad area, India: its impact on solar radiation using satellite data and ground measurements. THE SCIENCE OF THE TOTAL ENVIRONMENT 2007; 384:316-32. [PMID: 17599393 DOI: 10.1016/j.scitotenv.2007.05.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2006] [Revised: 04/27/2007] [Accepted: 05/19/2007] [Indexed: 05/16/2023]
Abstract
According to the Earth Observatory dust outbreaks are considered as natural hazards, which affect the ecosystems and human life. The main objective of this study is to assess and monitor the movement of aerosols and pollutants from local or other sources, both natural and anthropogenic, using a combination of ground-based monitoring and satellite data. The turbid and polluted atmosphere in the densely-populated area of Hyderabad, India is further degradated from dust outbreaks originated from Thar desert. A dust event occurred during 10th to 11th April 2006 in the northwest region of India; its plume substantially spreaded across the downwind direction affecting the study region. Using both irradiance measurements and satellite data this dust event is investigated. The analysis shows a significant change in Aerosol Optical Depth (AOD), Aerosol Index (AI) and aerosol-particle size during the dust event. The Aerosol Optical Depth in the dusty day is about 0.2 higher than the previous non-dusty days, while the Angström exponent rapidly decreases when the dust plume affected the study area. The surface PM concentrations show enhanced values during the dusty day directly influenced by the dust deposition. There is also a remarkable decrease in ground-reaching global radiation, UV erythemal (UV(ery)) and other irradiance components. The analysis suggested that the use of the diffuse-to-direct-beam ratio is the most appropriate parameter for the dust monitoring since its values at the longer wavelengths are not affected by the solar zenith angle.
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Affiliation(s)
- K V S Badarinath
- Atmospheric Sciences Section, National Remote Sensing Agency, Department of Space, Government of India, Balanagar, Hyderabad-500 037, India.
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29
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Matichuk RI, Colarco PR, Smith JA, Toon OB. Modeling the transport and optical properties of smoke aerosols from African savanna fires during the Southern African Regional Science Initiative campaign (SAFARI 2000). ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd007528] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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30
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Edwards DP, Emmons LK, Gille JC, Chu A, Attié JL, Giglio L, Wood SW, Haywood J, Deeter MN, Massie ST, Ziskin DC, Drummond JR. Satellite-observed pollution from Southern Hemisphere biomass burning. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005jd006655] [Citation(s) in RCA: 229] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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31
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Schuster GL, Dubovik O, Holben BN. Angstrom exponent and bimodal aerosol size distributions. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005jd006328] [Citation(s) in RCA: 510] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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32
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Eck TF, Holben BN, Dubovik O, Smirnov A, Goloub P, Chen HB, Chatenet B, Gomes L, Zhang XY, Tsay SC, Ji Q, Giles D, Slutsker I. Columnar aerosol optical properties at AERONET sites in central eastern Asia and aerosol transport to the tropical mid-Pacific. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004jd005274] [Citation(s) in RCA: 318] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- T. F. Eck
- Goddard Earth Sciences and Technology Center; University of Maryland-Baltimore County; Baltimore Maryland USA
- Biospheric Sciences Branch; NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | - B. N. Holben
- Biospheric Sciences Branch; NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | - O. Dubovik
- Goddard Earth Sciences and Technology Center; University of Maryland-Baltimore County; Baltimore Maryland USA
- Biospheric Sciences Branch; NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | - A. Smirnov
- Goddard Earth Sciences and Technology Center; University of Maryland-Baltimore County; Baltimore Maryland USA
- Biospheric Sciences Branch; NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | - P. Goloub
- Laboratoire d'Optique Amosphérique; Université des Sciences et Technologies de Lille; Villeneuve d'Ascq France
| | - H. B. Chen
- Institute of Atmospheric Physics; Chinese Academy of Sciences; Beijing China
| | - B. Chatenet
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA); Université Paris; Creteil France
| | - L. Gomes
- CNRS; Metéo-France/CNRM/GMEI/MNPCA; Toulouse France
| | - X.-Y. Zhang
- Institute of Earth Environment; Chinese Academy of Sciences; XiAn China
| | - S.-C. Tsay
- Climate and Radiation Branch; NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | - Q. Ji
- Climate and Radiation Branch; NASA Goddard Space Flight Center; Greenbelt Maryland USA
- Science Systems and Applications, Inc.; Lanham Maryland USA
| | - D. Giles
- Biospheric Sciences Branch; NASA Goddard Space Flight Center; Greenbelt Maryland USA
- Science Systems and Applications, Inc.; Lanham Maryland USA
| | - I. Slutsker
- Biospheric Sciences Branch; NASA Goddard Space Flight Center; Greenbelt Maryland USA
- Science Systems and Applications, Inc.; Lanham Maryland USA
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33
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Kim DH. Aerosol radiative forcing over east Asia determined from ground-based solar radiation measurements. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004jd004678] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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34
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Jethva H, Satheesh SK, Srinivasan J. Seasonal variability of aerosols over the Indo-Gangetic basin. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2005jd005938] [Citation(s) in RCA: 143] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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35
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Müller D. Raman lidar observations of aged Siberian and Canadian forest fire smoke in the free troposphere over Germany in 2003: Microphysical particle characterization. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004jd005756] [Citation(s) in RCA: 186] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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36
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McMeeking GR. Observations of smoke-influenced aerosol during the Yosemite Aerosol Characterization Study: 2. Aerosol scattering and absorbing properties. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004jd005624] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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37
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Pace G, Meloni D, di Sarra A. Forest fire aerosol over the Mediterranean basin during summer 2003. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2005jd005986] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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38
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O'Neill NT. Robust optical features of fine mode size distributions: Application to the Québec smoke event of 2002. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004jd005157] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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39
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Chung CE, Ramanathan V, Kim D, Podgorny IA. Global anthropogenic aerosol direct forcing derived from satellite and ground-based observations. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2005jd006356] [Citation(s) in RCA: 230] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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40
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Kim DH. Aerosol optical properties over east Asia determined from ground-based sky radiation measurements. ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2003jd003387] [Citation(s) in RCA: 152] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Hansell RA, Tsay SC, Ji Q, Liou KN, Ou SC. Surface aerosol radiative forcing derived from collocated ground-based radiometric observations during PRIDE, SAFARI, and ACE-Asia. APPLIED OPTICS 2003; 42:5533-5544. [PMID: 14526843 DOI: 10.1364/ao.42.005533] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
An approach is presented to estimate the surface aerosol radiative forcing by use of collocated cloud-screened narrowband spectral and thermal-offset-corrected radiometric observations during the Puerto Rico Dust Experiment 2000, South African Fire Atmosphere Research Initiative (SAFARI) 2000, and Aerosol Characterization Experiment-Asia 2001. We show that aerosol optical depths from the Multiple-Filter Rotating Shadowband Radiometer data match closely with those from the Cimel sunphotometer data for two SAFARI-2000 dates. The observed aerosol radiative forcings were interpreted on the basis of results from the Fu-Liou radiative transfer model, and, in some cases, cross checked with satellite-derived forcing parameters. Values of the aerosol radiative forcing and forcing efficiency, which quantifies the sensitivity of the surface fluxes to the aerosol optical depth, were generated on the basis of a differential technique for all three campaigns, and their scientific significance is discussed.
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Affiliation(s)
- Richard A Hansell
- Department of Atmospheric Sciences, University of California, Los Angeles, Los Angeles, California 90095-1565, USA.
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42
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Queface AJ, Piketh SJ, Annegarn HJ, Holben BN, Uthui RJ. Retrieval of aerosol optical thickness and size distribution from the CIMEL Sun photometer over Inhaca Island, Mozambique. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd002374] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Antonio J. Queface
- Climatology Research Group; University of the Witwatersrand; Johannesburg South Africa
| | - Stuart J. Piketh
- Climatology Research Group; University of the Witwatersrand; Johannesburg South Africa
| | - Harold J. Annegarn
- Atmosphere and Energy Research Group; University of the Witwatersrand; Johannesburg South Africa
| | - Brent N. Holben
- Biospheric Sciences Branch; NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | - Rogerio J. Uthui
- Department of Physics; Eduardo Mondlane University; Maputo Mozambique
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43
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Myhre G, Berntsen TK, Haywood JM, Sundet JK, Holben BN, Johnsrud M, Stordal F. Modeling the solar radiative impact of aerosols from biomass burning during the Southern African Regional Science Initiative (SAFARI-2000) experiment. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd002313] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Gunnar Myhre
- Department of Geophysics; University of Oslo; Oslo Norway
- Norwegian Institute for Air Research; Kjeller Norway
| | - Terje K. Berntsen
- Department of Geophysics; University of Oslo; Oslo Norway
- Center for International Climate and Environmental Research-Oslo; Oslo Norway
| | | | | | - Brent N. Holben
- Biospheric Sciences Branch; NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | - Mona Johnsrud
- Norwegian Institute for Air Research; Kjeller Norway
| | - Frode Stordal
- Department of Geophysics; University of Oslo; Oslo Norway
- Norwegian Institute for Air Research; Kjeller Norway
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44
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Ichoku C, Remer LA, Kaufman YJ, Levy R, Chu DA, Tanré D, Holben BN. MODIS observation of aerosols and estimation of aerosol radiative forcing over southern Africa during SAFARI 2000. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd002366] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Charles Ichoku
- Science Systems and Applications, Inc.; Lanham Maryland USA
- Laboratory for Atmospheres; NASA/GSFC; Greenbelt Maryland USA
| | | | | | - Robert Levy
- Science Systems and Applications, Inc.; Lanham Maryland USA
- Laboratory for Atmospheres; NASA/GSFC; Greenbelt Maryland USA
| | - D. Allen Chu
- Science Systems and Applications, Inc.; Lanham Maryland USA
- Laboratory for Atmospheres; NASA/GSFC; Greenbelt Maryland USA
| | - Didier Tanré
- Laboratoire d'Optique Atmosphérique; Centre National de la Recherche Scientifique et Université des Sciences et Technologies de Lille; Villeneuve d'Ascq France
| | - Brent N. Holben
- Laboratory for Terrestrial Physics; NASA/GSFC; Greenbelt Maryland USA
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45
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Schmid B, Redemann J, Russell PB, Hobbs PV, Hlavka DL, McGill MJ, Holben BN, Welton EJ, Campbell JR, Torres O, Kahn RA, Diner DJ, Helmlinger MC, Chu DA, Robles-Gonzalez C, de Leeuw G. Coordinated airborne, spaceborne, and ground-based measurements of massive thick aerosol layers during the dry season in southern Africa. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd002297] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- B. Schmid
- Bay Area Environmental Research Institute; Sonoma California USA
| | - J. Redemann
- Bay Area Environmental Research Institute; Sonoma California USA
| | - P. B. Russell
- NASA Ames Research Center; Moffett Field California USA
| | - P. V. Hobbs
- Department of Atmospheric Sciences; University of Washington; Seattle Washington USA
| | - D. L. Hlavka
- Science Systems and Applications, Inc.; NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | - M. J. McGill
- NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | - B. N. Holben
- NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | - E. J. Welton
- Goddard Earth Sciences and Technology Center; NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | - J. R. Campbell
- Science Systems and Applications, Inc.; NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | - O. Torres
- Joint Center for Earth Systems; University of Maryland, Baltimore County; Greenbelt Maryland USA
| | - R. A. Kahn
- Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA
| | - D. J. Diner
- Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA
| | - M. C. Helmlinger
- Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA
| | - D. A. Chu
- Science Systems and Applications, Inc.; NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | | | - G. de Leeuw
- TNO Physics and Electronics Laboratory; The Hague Netherlands
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46
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Eck TF, Holben BN, Ward DE, Mukelabai MM, Dubovik O, Smirnov A, Schafer JS, Hsu NC, Piketh SJ, Queface A, Roux JL, Swap RJ, Slutsker I. Variability of biomass burning aerosol optical characteristics in southern Africa during the SAFARI 2000 dry season campaign and a comparison of single scattering albedo estimates from radiometric measurements. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd002321] [Citation(s) in RCA: 121] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- T. F. Eck
- Goddard Earth Sciences and Technology Center; University of Maryland-Baltimore County; Baltimore Maryland USA
- Biospheric Sciences Branch; National Aeronautics and Space Administration/Goddard Space Flight Center; Greenbelt Maryland USA
| | - B. N. Holben
- Biospheric Sciences Branch; National Aeronautics and Space Administration/Goddard Space Flight Center; Greenbelt Maryland USA
| | - D. E. Ward
- Enviropyronics; White Salmon Washington USA
| | | | - O. Dubovik
- Goddard Earth Sciences and Technology Center; University of Maryland-Baltimore County; Baltimore Maryland USA
- Biospheric Sciences Branch; National Aeronautics and Space Administration/Goddard Space Flight Center; Greenbelt Maryland USA
| | - A. Smirnov
- Goddard Earth Sciences and Technology Center; University of Maryland-Baltimore County; Baltimore Maryland USA
- Biospheric Sciences Branch; National Aeronautics and Space Administration/Goddard Space Flight Center; Greenbelt Maryland USA
| | - J. S. Schafer
- Biospheric Sciences Branch; National Aeronautics and Space Administration/Goddard Space Flight Center; Greenbelt Maryland USA
- Science Systems and Applications Inc.; National Aeronautics and Space Administration/Goddard Space Flight Center; Greenbelt Maryland USA
| | - N. C. Hsu
- Goddard Earth Sciences and Technology Center; University of Maryland-Baltimore County; Baltimore Maryland USA
| | - S. J. Piketh
- Climatology Research Group; University of Witwatersrand; Gauteng South Africa
| | - A. Queface
- Climatology Research Group; University of Witwatersrand; Gauteng South Africa
| | - J. Le Roux
- Etosha Ecological Institute; Okaukuejo Namibia
| | - R. J. Swap
- Department of Environmental Sciences; University of Virginia; Charlottesville Virginia USA
| | - I. Slutsker
- Biospheric Sciences Branch; National Aeronautics and Space Administration/Goddard Space Flight Center; Greenbelt Maryland USA
- Science Systems and Applications Inc.; National Aeronautics and Space Administration/Goddard Space Flight Center; Greenbelt Maryland USA
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47
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Haywood JM, Osborne SR, Francis PN, Keil A, Formenti P, Andreae MO, Kaye PH. The mean physical and optical properties of regional haze dominated by biomass burning aerosol measured from the C-130 aircraft during SAFARI 2000. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd002226] [Citation(s) in RCA: 194] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | | | | | | | - Paola Formenti
- Biochemistry Department; Max Planck Institute for Chemistry; Mainz Germany
| | - Meinrat O. Andreae
- Biochemistry Department; Max Planck Institute for Chemistry; Mainz Germany
| | - Paul H. Kaye
- Science and Technology Researh Centre; University of Hertfordshire; Hatfield UK
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48
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Bergstrom RW, Pilewskie P, Schmid B, Russell PB. Estimates of the spectral aerosol single scattering albedo and aerosol radiative effects during SAFARI 2000. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd002435] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | | | - Beat Schmid
- Bay Area Environmental Research Institute; Sonoma California USA
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49
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Livingston JM. Airborne Sun photometer measurements of aerosol optical depth and columnar water vapor during the Puerto Rico Dust Experiment and comparison with land, aircraft, and satellite measurements. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd002520] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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50
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Müller D. Indo-Asian pollution during INDOEX: Microphysical particle properties and single-scattering albedo inferred from multiwavelength lidar observations. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2003jd003538] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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