1
|
Dasari S, Andersson A, Popa ME, Röckmann T, Holmstrand H, Budhavant K, Gustafsson Ö. Observational Evidence of Large Contribution from Primary Sources for Carbon Monoxide in the South Asian Outflow. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:165-174. [PMID: 34914368 PMCID: PMC8733925 DOI: 10.1021/acs.est.1c05486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 11/27/2021] [Accepted: 11/30/2021] [Indexed: 06/14/2023]
Abstract
South Asian air is among the most polluted in the world, causing premature death of millions and asserting a strong perturbation of the regional climate. A central component is carbon monoxide (CO), which is a key modulator of the oxidizing capacity of the atmosphere and a potent indirect greenhouse gas. While CO concentrations are declining elsewhere, South Asia exhibits an increasing trend for unresolved reasons. In this paper, we use dual-isotope (δ13C and δ18O) fingerprinting of CO intercepted in the South Asian outflow to constrain the relative contributions from primary and secondary CO sources. Results show that combustion-derived primary sources dominate the wintertime continental CO fingerprint (fprimary ∼ 79 ± 4%), significantly higher than the global estimate (fprimary ∼ 55 ± 5%). Satellite-based inventory estimates match isotope-constrained fprimary-CO, suggesting observational convergence in source characterization and a prospect for model-observation reconciliation. This "ground-truthing" emphasizes the pressing need to mitigate incomplete combustion activities for climate/air quality benefits in South Asia.
Collapse
Affiliation(s)
- Sanjeev Dasari
- Department
of Environmental Science, and the Bolin Centre for Climate Research, Stockholm University, Stockholm 10691, Sweden
| | - August Andersson
- Department
of Environmental Science, and the Bolin Centre for Climate Research, Stockholm University, Stockholm 10691, Sweden
| | - Maria E. Popa
- Institute
for Marine and Atmospheric Research Utrecht (IMAU), Utrecht University, Utrecht 3584CC, The Netherlands
| | - Thomas Röckmann
- Institute
for Marine and Atmospheric Research Utrecht (IMAU), Utrecht University, Utrecht 3584CC, The Netherlands
| | - Henry Holmstrand
- Department
of Environmental Science, and the Bolin Centre for Climate Research, Stockholm University, Stockholm 10691, Sweden
| | - Krishnakant Budhavant
- Department
of Environmental Science, and the Bolin Centre for Climate Research, Stockholm University, Stockholm 10691, Sweden
- Maldives
Climate Observatory at Hanimaadhoo (MCOH), Maldives Meteorological Services, Hanimaadhoo 02020, Republic
of the Maldives
- Centre
for Atmospheric and Oceanic Sciences and Divecha Centre for Climate
Change, Indian Institute of Sciences (IISC), Bangalore 560012, India
| | - Örjan Gustafsson
- Department
of Environmental Science, and the Bolin Centre for Climate Research, Stockholm University, Stockholm 10691, Sweden
| |
Collapse
|
2
|
Satellite-Observed Variations and Trends in Carbon Monoxide over Asia and Their Sensitivities to Biomass Burning. REMOTE SENSING 2020. [DOI: 10.3390/rs12050830] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
As the carbon monoxide (CO) total column over Asia is among the highest in the world, it is important to characterize its variations in space and time. Using Measurements of Pollution in the Troposphere (MOPITT) and Atmospheric InfraRed Sounder (AIRS) satellite data, the variations and trends in CO total column over Asia and its seven subregions during 2003–2017 are investigated in this study. The CO total column in Asia is higher in spring and winter than in summer and autumn. The seasonal maximum and minimum are in spring and summer respectively in the regional mean over Asia, varying between land and oceans, as well as among the subregions. The CO total column in Asia shows strong interannual variation, with a regional mean coefficient of variation of 5.8% in MOPITT data. From 2003 to 2017, the annual mean of CO total column over Asia decreased significantly at a rate of (0.58 ± 0.15)% per year (or −(0.11 ± 0.03) × 1017 molecules cm−2 per year) in MOPITT data, resulting from significant CO decreases in winter, summer, and spring. In most of the subregions, significant decreasing trends in CO total column are also observed, more obviously over areas with high CO total column, including eastern regions of China and the Sichuan Basin. The regional decreasing trends in these areas are over 1% per year. Over the entire Asia, and in fire-prone subregions including South Siberia, Indo-China Peninsula, and Indonesia, we found significant correlations between the MOPITT CO total column and the fire counts from the Moderate Resolution Imaging Spectroradiometer (MODIS). The variations in MODIS fire counts may explain 58%, 60%, 36%, and 71% of the interannual variation in CO total column in Asia and these three subregions, respectively. Over different land cover types, the variations in biomass burning may explain 62%, 52%, and 31% of the interannual variation in CO total column, respectively, over the forest, grassland, and shrubland in Asia. Extremes in CO total column in Asia can be largely explained by the extreme fire events, such as the fires over Siberia in 2003 and 2012 and over Indonesia in 2006 and 2015. The significant decreasing trends in MODIS fire counts inside and outside Asia suggest that global biomass burning may be a driver for the decreasing trend in CO total column in Asia, especially in spring. In general, the variations and trends in CO total column over Asia detected by AIRS are similar to but smaller than those by MOPITT. The two datasets show similar spatial and temporal variations in CO total column over Asia, with correlation coefficients of 0.86–0.98 in the annual means. This study shows that the interannual variation in atmospheric CO in Asia is sensitive to biomass burning, while the decreasing trend in atmospheric CO over Asia coincides with the decreasing trend in MODIS fire counts from 2003 to 2017.
Collapse
|
3
|
Wu K, Feng Y, Yu G, Liu L, Li J, Xiong Y, Li F. Development of an imaging gas correlation spectrometry based mid-infrared camera for two-dimensional mapping of CO in vehicle exhausts. OPTICS EXPRESS 2018; 26:8239-8251. [PMID: 29715793 DOI: 10.1364/oe.26.008239] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 03/02/2018] [Indexed: 06/08/2023]
Abstract
Real-time imaging of CO in vehicle exhaust was demonstrated using a gas correlation spectrometry based mid-infrared camera for the first time. The novel gas-correlation imaging technique is used to eliminate the spectral interferences from background radiation and other major combustion products, and reduce the influences of the optical jitter and temperature variations, thereby identifying and quantifying the gas. We take several spectral factors into account for the instrument design, concentration calibration and data evaluation, including atmospheric transmission, radiation interference, as well as the spectral response of infrared camera, filter and gas cell. A calibration method based on the molecular spectroscopy and radiative transfer equation is developed to identify the numerical relationship between the CO concentration × length and the measured image intensity. Two-dimensional CO distribution of vehicle exhaust with a time resolution of 50 Hz and detection limit of 20 ppm × meter is achieved when the distance between optical equipment and engine nozzle is 3 m. The gas correlation spectrometry based mid-infrared camera shows a great potential as a future technique to monitor vehicle pollution emissions quantitatively and visually.
Collapse
|
4
|
Pandey AK, Mishra AK, Kumar R, Berwal S, Devadas R, Huete A, Kumar K. CO variability and its association with household cooking fuels consumption over the Indo-Gangetic Plains. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 222:83-93. [PMID: 28069367 DOI: 10.1016/j.envpol.2016.12.080] [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: 06/22/2016] [Revised: 12/14/2016] [Accepted: 12/29/2016] [Indexed: 06/06/2023]
Abstract
This study examines the spatio-temporal trends obtained from decade long (Jan 2003-Dec 2014) satellite observational data of Atmospheric Infrared Sounder (AIRS) and Measurements of Pollution in the Troposphere (MOPITT) on carbon monoxide (CO) concentration over the Indo-Gangetic Plains (IGP) region. The time sequence plots of columnar CO levels over the western, central and eastern IGP regions reveal marked seasonal behaviour, with lowest CO levels occurring during the monsoon months and the highest CO levels occurring during the pre-monsoon period. A negative correlation between CO levels and rainfall is observed. CO vertical profiles show relatively high values in the upper troposphere at ∼200 hPa level during the monsoon months, thus suggesting the role of convective transport and advection in addition to washout behind the decreased CO levels during this period. MOPITT and AIRS observations show a decreasing trend of 9.6 × 1015 and 1.5 × 1016 molecules cm-2 yr-1, respectively, in columnar CO levels over the IGP region. The results show the existence of a spatial gradient in CO from the eastern (higher levels) to western IGP region (lower levels). Data from the Census of India on the number of households using various cooking fuels in the IGP region shows the prevalence of biomass-fuel (i.e. firewood, crop residue, cowdung etc.) use over the eastern and central IGP regions and that of liquefied petroleum gas over the western IGP region. CO emission estimates from cooking activity over the three IGP regions are found to be in the order east > central > west, which support the existence of the spatial gradient in CO from eastern to the western IGP region. Our results support the intervention of present Indian government on limiting the use of biomass-fuels in domestic cooking to achieve the benefits in terms of the better air quality, household health and regional/global climate change mitigation.
Collapse
Affiliation(s)
- Alok Kumar Pandey
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Amit Kumar Mishra
- Environmental and Biomedical Metrology Division, National Physical Laboratory, New Delhi, India
| | - Ritesh Kumar
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Shivesh Berwal
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Rakhesh Devadas
- Climate Change Cluster, University of Technology-Sydney, Sydney, Australia
| | - Alfredo Huete
- Climate Change Cluster, University of Technology-Sydney, Sydney, Australia
| | - Krishan Kumar
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India.
| |
Collapse
|
5
|
Ghude SD, Kulkarni SH, Kulkarni PS, Kanawade VP, Fadnavis S, Pokhrel S, Jena C, Beig G, Bortoli D. Anomalous low tropospheric column ozone over eastern India during the severe drought event of monsoon 2002: a case study. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2011; 18:1442-1455. [PMID: 21494819 DOI: 10.1007/s11356-011-0506-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2010] [Accepted: 03/28/2011] [Indexed: 05/30/2023]
Abstract
BACKGROUND, AIM, AND SCOPE The present study is an attempt to examine some of the probable causes of the unusually low tropospheric column ozone observed over eastern India during the exceptional drought event in July 2002. METHOD We examined horizontal wind and omega (vertical velocity) anomalies over the Indian region to understand the large-scale dynamical processes which prevailed in July 2002. We also examined anomalies in tropospheric carbon monoxide (CO), an important ozone precursor, and observed low CO mixing ratio in the free troposphere in 2002 over eastern India. RESULTS AND DISCUSSION It was found that instead of a normal large-scale ascent, the air was descending in the middle and lower troposphere over a vast part of India. This configuration was apparently responsible for the less convective upwelling of precursors and likely caused less photochemical ozone formation in the free troposphere over eastern India in July 2002. CONCLUSION The insight gained from this case study will hopefully provide a better understanding of the process controlling the distribution of the tropospheric ozone over the Indian region.
Collapse
Affiliation(s)
- Sachin D Ghude
- Indian Institute of Tropical Meteorology, Pune 411008, India.
| | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Srivastava S, Lal S, Venkataramani S, Gupta S, Acharya YB. Vertical distribution of ozone in the lower troposphere over the Bay of Bengal and the Arabian Sea during ICARB-2006: Effects of continental outflow. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2010jd015298] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
7
|
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]
|
8
|
Zhao C, Wang Y, Yang Q, Fu R, Cunnold D, Choi Y. Impact of East Asian summer monsoon on the air quality over China: View from space. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jd012745] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
9
|
de Laat ATJ, Gloudemans AMS, Aben I, Schrijver H. Global evaluation of SCIAMACHY and MOPITT carbon monoxide column differences for 2004–2005. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jd012698] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
10
|
Kar J, Jones DBA, Drummond JR. Comment on “Seasonal distribution of ozone and its precursors over the tropical Indian region using regional chemistry-transport model” by Sompriti Roy et al. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2009jd011742] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|