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Aswini AR, Hegde P, Aryasree S, Girach IA, Nair PR. Continental outflow of anthropogenic aerosols over Arabian Sea and Indian Ocean during wintertime: ICARB-2018 campaign. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 712:135214. [PMID: 31836221 DOI: 10.1016/j.scitotenv.2019.135214] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 10/23/2019] [Accepted: 10/24/2019] [Indexed: 06/10/2023]
Abstract
Chemical characterisation of atmospheric aerosols over Arabian Sea (AS) and Indian Ocean (IO) have been carried out during the winter period (January to February 2018) as part of the Integrated Campaign for Aerosols, gases and Radiation Budget (ICARB-2018). Mass concentrations of organic carbon (OC), elemental carbon (EC), water soluble and insoluble OC (WSOC, WIOC), primary and secondary OC (POC, SOC), water-soluble inorganic ions and trace metals have been estimated with a view to identify and quantify the major anthropogenic pollutants affecting the oceanic environments. Aerosol mass loading was found to exhibit strong spatial heterogeneity (varying from 13 to 84 μg m-3), significantly modulated by the origin of air-mass trajectories. Chemical analysis of aerosols revealed the presence of an intense pollution plume over south-eastern coastal Arabian Sea, near to south-west Indian peninsula (extending from ~ 12°N to 0° at 75°E) with a strong latitudinal gradient (~3 μg m-3/deg. from north to south) dominated by anthropogenic species contributing as high as 73% (38% nss-SO42-, 24.2% carbonaceous aerosols (21% Organic Matter, 3.2% EC) and 10% NH4+). Anthropogenic signature over oceanic environment was also evident from the dominance and high enrichment of elements like Zn, Cu, Mn and Pb in trace metals. Long-range transport of air-masses originating from Indo Gangetic Plains and its outflow regions in Bay of Bengal, has been seen over Arabian Sea during winter, that imparted such strong anthropogenic signatures over this oceanic environment. Comparison with previous cruise studies conducted nearly two decades ago shows a more than two-fold increase in the concentration of nss-SO42-, over the continental outflow region in Arabian Sea.
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Affiliation(s)
- A R Aswini
- Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, India; Cochin University of Science and Technology, Cochin, India
| | - Prashant Hegde
- Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, India.
| | - S Aryasree
- Institute for applied Geosciences, Technical University Darmstadt, Darmstadt, Germany
| | - Imran A Girach
- Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, India
| | - Prabha R Nair
- Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, India
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Srivastava AK, Bisht DS, Tiwari S. Boundary layer aerosol characteristics at Mahabubnagar during CAIPEEX-IGOC: modeling the optical and radiative properties. THE SCIENCE OF THE TOTAL ENVIRONMENT 2014; 468-469:1093-1102. [PMID: 24103256 DOI: 10.1016/j.scitotenv.2013.09.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Revised: 07/09/2013] [Accepted: 09/15/2013] [Indexed: 06/02/2023]
Abstract
An Integrated Ground Observational Campaign (IGOC) was conducted at Mahabubnagar--a tropical rural station in the southern peninsular India, under the Cloud Aerosol Interaction and Precipitation Enhancement Experiment (CAIPEEX) program during the period from July to November 2011. Measured chemical composition and carbonaceous aerosols from PM2.5 samples were used in an aerosol optical model to deduce crucial aerosol optical properties, which were then used in a radiative transfer model for radiative forcing estimations. The model derived aerosol optical depth (AOD at 500 nm), varied from 0.13 to 0.76 (mean of 0.40 ± 0.18) whereas Ångström exponent (AE) between 0.10 and 0.65 (mean of 0.33 ± 0.17) suggests relative dominance of coarse particles over the station. On the other hand, single scattering albedo (SSA at 500 nm) was found to vary from 0.78 to 0.92 (mean of 0.87 ± 0.04) during the measurement period. The magnitude of absorption Ångström exponent (AAE), varied from 0.83 to 1.33 (mean of 1.10 ± 0.15), suggests mixed type aerosols over the station. Aerosol direct radiative forcing was estimated and found to vary from -8.9 to -49.3 W m(-2) (mean of -27.4 ± 11.8 W m(-2)) at the surface and +9.7 to +44.5 W m(-2) (mean of +21.3 ± 9.4 W m(-2)) in the atmosphere during the course of measurements. The atmospheric forcing was observed to be ~30% higher during October (+ 29 ± 9 W m(-2)) as compared to August (+21 ± 7 W m(-2)) when the station is mostly influenced by continental polluted aerosols. The result suggests an additional atmospheric heating rate of 0.24 K day(-1) during October, which may be crucial for various boundary layer processes in favorable atmospheric conditions.
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Affiliation(s)
- A K Srivastava
- Indian Institute of Tropical Meteorology (Branch), Prof. Ramnath Vij Marg, New Delhi, India.
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Moorthy KK, Beegum SN, Babu SS, Smirnov A, John SR, Kumar KR, Narasimhulu K, Dutt CBS, Nair VS. Optical and physical characteristics of Bay of Bengal aerosols during W-ICARB: Spatial and vertical heterogeneities in the marine atmospheric boundary layer and in the vertical column. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2010jd014094] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- K. Krishna Moorthy
- Space Physics Laboratory; Vikram Sarabhai Space Centre; Trivandrum India
| | - S. Naseema Beegum
- Space Physics Laboratory; Vikram Sarabhai Space Centre; Trivandrum India
| | - S. Suresh Babu
- Space Physics Laboratory; Vikram Sarabhai Space Centre; Trivandrum India
| | - Alexander Smirnov
- Biospheric Sciences Branch; NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | | | | | - K. Narasimhulu
- Department of Physics; Sri Krishnadevaraya University; Anantapur India
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Jethva H, Satheesh SK, Srinivasan J, Levy RC. Improved retrieval of aerosol size-resolved properties from moderate resolution imaging spectroradiometer over India: Role of aerosol model and surface reflectance. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jd013218] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Dey S, Di Girolamo L. A climatology of aerosol optical and microphysical properties over the Indian subcontinent from 9 years (2000–2008) of Multiangle Imaging Spectroradiometer (MISR) data. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jd013395] [Citation(s) in RCA: 196] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Raghavendra Kumar K, Narasimhulu K, Balakrishnaiah G, Suresh Kumar Reddy B, Rama Gopal K, Reddy RR, Moorthy KK, Suresh Babu S. Size segregated mass concentration and size distribution of near surface aerosols over a tropical Indian semi-arid station, Anantapur: Impact of long range transport. THE SCIENCE OF THE TOTAL ENVIRONMENT 2009; 407:5589-5604. [PMID: 19640569 DOI: 10.1016/j.scitotenv.2009.06.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2009] [Revised: 06/23/2009] [Accepted: 06/23/2009] [Indexed: 05/28/2023]
Abstract
Regular measurements of size segregated as well as total mass concentration and size distribution of near surface composite aerosols, made using a ten-channel Quartz Crystal Microbalance (QCM) cascade impactor during the period of September 2007-May 2008 are used to study the aerosol characteristics in association with the synoptic meteorology. The total mass concentration varied from 59.70+/-1.48 to 41.40+/-1.72 microg m(-3), out of which accumulation mode dominated by approximately 50%. On a synoptic scale, aerosol mass concentration in the accumulation (submicron) mode gradually increased from an average low value of approximately 26.92+/-1.53 microg m(-3) during the post monsoon season (September-November) to approximately 34.95+/-1.32 microg m(-3) during winter (December-February) and reaching a peak value of approximately 43.56+/-1.42 microg m(-3) during the summer season (March-May). On the contrary, mass concentration of aerosols in the coarse (supermicron) mode increased from approximately 9.23+/-1.25 microg m(-3)during post monsoon season to reach a comparatively high value of approximately 25.89+/-1.95 microg m(-3) during dry winter months and a low value of approximately 8.07+/-0.76 microg m(-3) during the summer season. Effective radius, a parameter important in determining optical (scattering) properties of aerosol size distribution, varied between 0.104+/-0.08 microm and 0.167+/-0.06 microm with a mean value of 0.143+/-0.01 microm. The fine mode is highly reduced during the post monsoon period and the large and coarse modes continue to remain high (replenished) so that their relative dominance increases. It can be seen that among the two parameters measured, correlation of total mass concentration with air temperature is positive (R(2)=0.82) compared with relative humidity (RH) (R(2)=0.75).
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Affiliation(s)
- K Raghavendra Kumar
- Aerosol & Atmospheric Research Laboratory, Department of Physics, Sri Krishnadevaraya University, Anantapur - 515 055, India
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Kumar KR, Narasimhulu K, Reddy RR, Gopal KR, Reddy LSS, Balakrishnaiah G, Moorthy KK, Babu SS. Temporal and spectral characteristics of aerosol optical depths in a semi-arid region of southern India. THE SCIENCE OF THE TOTAL ENVIRONMENT 2009; 407:2673-2688. [PMID: 19217146 DOI: 10.1016/j.scitotenv.2008.10.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2008] [Revised: 10/14/2008] [Accepted: 10/15/2008] [Indexed: 05/27/2023]
Abstract
The spectral and temporal variations of aerosol optical depths (AOD) observed over Anantapur (a semi-arid region) located in the Southern part of India are investigated by analyzing the data obtained from a Multiwavelength Solar Radiometer (MWR) during January 2005-December 2006 (a total of 404 clear-sky observations) using the Langley technique. In this paper, we highlighted the studies on monthly, seasonal and spectral variations of aerosol optical depth and their implications. The results showed seasonal variation with higher values during pre-monsoon (March-May) and lower in the monsoon (June-November) season at all wavelengths. The pre-monsoon increase is found to be due to the high wind speed producing larger amounts of wind-driven dust particles. The post-monsoon (December-February) AOD values decrease more at higher wavelengths, indicating a general reduction in the number of bigger particles. Also during the post-monsoon, direction of winds in association with high or low pressure weather systems and the air brings more aerosol content to the region which is surrounded by a number of cement plants, lime kilns, slab polishing and brick making units. The quantity of AOD values in pre-monsoon is higher (low during post-monsoon) for wavelength, such as shortwave infrared (SWIR) or near infrared (NIR), which shows that coarse particles contribute more compare with the sub-micron particles. The composite aerosols near the surface follow suit with the share of the accumulation mode to the total mass concentration decreasing from approximately 70% to 30% from post-monsoon to pre-monsoon. Coarse mode particle loading observed to be high during pre-monsoon and accumulation mode particles observed to be high during post-monsoon. The backward trajectories at three representative altitudes with source point at the observing site indicate a possible transport from the outflow regions into Bay of Bengal, southern peninsular India and Arabian Sea. The temporal variations of AOD, Angstrom wavelength exponent and precipitable water content over Anantapur have also been compared with those reported from selected locations in India.
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Affiliation(s)
- K Raghavendra Kumar
- Aerosol & Atmospheric Research Laboratory, Department of Physics Sri Krishnadevaraya University, Anantapur-515055, India
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Satheesh SK, Krishna Moorthy K, Suresh Babu S, Vinoj V, Nair VS, Naseema Beegum S, Dutt CBS, Alappattu DP, Kunhikrishnan PK. Vertical structure and horizontal gradients of aerosol extinction coefficients over coastal India inferred from airborne lidar measurements during the Integrated Campaign for Aerosol, Gases and Radiation Budget (ICARB) field campaign. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jd011033] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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George SK, Nair PR, Parameswaran K, Jacob S, Abraham A. Seasonal trends in chemical composition of aerosols at a tropical coastal site of India. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd009507] [Citation(s) in RCA: 41] [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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Nair VS, Babu SS, Moorthy KK. Aerosol characteristics in the marine atmospheric boundary layer over the Bay of Bengal and Arabian Sea during ICARB: Spatial distribution and latitudinal and longitudinal gradients. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2008jd009823] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Pandithurai G, Dipu S, Dani KK, Tiwari S, Bisht DS, Devara PCS, Pinker RT. Aerosol radiative forcing during dust events over New Delhi, India. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2008jd009804] [Citation(s) in RCA: 196] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kedia S, Ramachandran S. Features of aerosol optical depths over the Bay of Bengal and the Arabian Sea during premonsoon season: Variabilities and anthropogenic influence. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd009070] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Adhikary B, Carmichael GR, Tang Y, Leung LR, Qian Y, Schauer JJ, Stone EA, Ramanathan V, Ramana MV. Characterization of the seasonal cycle of south Asian aerosols: A regional-scale modeling analysis. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd008143] [Citation(s) in RCA: 74] [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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Nair VS, Moorthy KK, Alappattu DP, Kunhikrishnan PK, George S, Nair PR, Babu SS, Abish B, Satheesh SK, Tripathi SN, Niranjan K, Madhavan BL, Srikant V, Dutt CBS, Badarinath KVS, Reddy RR. Wintertime aerosol characteristics over the Indo‐Gangetic Plain (IGP): Impacts of local boundary layer processes and long‐range transport. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd008099] [Citation(s) in RCA: 227] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | | | | | | | | | | | | | - B. Abish
- Space Physics Laboratory VSSC Trivandrum India
| | - S. K. Satheesh
- Centre for Atmospheric and Oceanic Sciences IISc Bangalore India
| | | | - K. Niranjan
- Department of Physics Andhra University Visakhapatnam India
| | - B. L. Madhavan
- Department of Physics Andhra University Visakhapatnam India
| | - V. Srikant
- Department of Physics Andhra University Visakhapatnam India
| | - C. B. S. Dutt
- Indian Space Research Organisation Head Quarters Antariksh Bhavan Bangalore India
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Moorthy KK, Babu SS, Satheesh SK, Srinivasan J, Dutt CBS. Dust absorption over the “Great Indian Desert” inferred using ground-based and satellite remote sensing. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd007690] [Citation(s) in RCA: 78] [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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Dey S, Tripathi SN. Estimation of aerosol optical properties and radiative effects in the Ganga basin, northern India, during the wintertime. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd007267] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Tripathi SN, Tare V, Chinnam N, Srivastava AK, Dey S, Agarwal A, Kishore S, Lal RB, Manar M, Kanawade VP, Chauhan SSS, Sharma M, Reddy RR, Gopal KR, Narasimhulu K, Reddy LSS, Gupta S, Lal S. Measurements of atmospheric parameters during Indian Space Research Organization Geosphere Biosphere Programme Land Campaign II at a typical location in the Ganga basin: 1. Physical and optical properties. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2006jd007278] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- S. N. Tripathi
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - Vinod Tare
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - N. Chinnam
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - A. K. Srivastava
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - Sagnik Dey
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - A. Agarwal
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - S. Kishore
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - R. B. Lal
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - Manish Manar
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - Vijay P. Kanawade
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - S. S. S. Chauhan
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - M. Sharma
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - R. R. Reddy
- Department of Physics; Sri Krishnadevaraya University; Anantapur India
| | - K. Rama Gopal
- Department of Physics; Sri Krishnadevaraya University; Anantapur India
| | - K. Narasimhulu
- Department of Physics; Sri Krishnadevaraya University; Anantapur India
| | | | | | - Shyam Lal
- Physical Research Laboratory; Ahmedabad India
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Tare V, Tripathi SN, Chinnam N, Srivastava AK, Dey S, Manar M, Kanawade VP, Agarwal A, Kishore S, Lal RB, Sharma M. Measurements of atmospheric parameters during Indian Space Research Organization Geosphere Biosphere Program Land Campaign II at a typical location in the Ganga Basin: 2. Chemical properties. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2006jd007279] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Vinod Tare
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - S. N. Tripathi
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - N. Chinnam
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - A. K. Srivastava
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - Sagnik Dey
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - M. Manar
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - Vijay P. Kanawade
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - A. Agarwal
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - S. Kishore
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - R. B. Lal
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
| | - M. Sharma
- Department of Civil Engineering; Indian Institute of Technology; Kanpur India
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Satheesh SK, Srinivasan J, Moorthy KK. Spatial and temporal heterogeneity in aerosol properties and radiative forcing over Bay of Bengal: Sources and role of aerosol transport. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005jd006374] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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