气候变化领域集成服务门户(CCPortal): Local emission and long-range transport impacts on the CO, CO2, and CH4 concentrations at a tropical rural site

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DOI	10.1016/j.atmosenv.2021.118397
	Local emission and long-range transport impacts on the CO, CO2, and CH4 concentrations at a tropical rural site
	Jain C.D.; Singh V.; Akhil Raj S.T.; Madhavan B.L.; Ratnam M.V.
发表日期	2021
ISSN	1352-2310
卷号	254
英文摘要	Local emission and long-range transport impacts on the observed concentrations (dry air mole fractions) of CO, CO2, and CH4 have been investigated using three years (April 2016 to April 2019) of surface measurements at a tropical rural site, Gadanki (13.5° N, 79.2° E) in Southern peninsular India. Gadanki represents the poor coverage area of Greenhouse Gas (GHG) measurements in India and has both local emission and long-range transport influences on its air masses. All the three gases have shown strong seasonality and diurnal variations. Trend analysis showed a significant decreasing trend in CO (14.3 ± 0.2 ppbv/year) and increasing trends in CO2 (2.5 ± 1.2 ppmv/year) and CH4 (11.1 ± 0.03 ppbv/year). CO2 and CH4 trends are marginally higher than the global trends (2.2 ± 0.004 ppmv/year and 7.0 ± 0.001 ppbv/year, respectively) for the same period highlighting the sustained local emission impact on the observed concentrations. Among the three species, CO has been the most local emission impacted species with local emission contribution (to the total observed concentration) varying between 4 and 25% during different seasons with a median value always lying above 10% irrespective of the season. In the case of CO2 and CH4, the local emission contribution found to vary in the range of 0.8–7% and 0.15–3%, respectively. Long-range transport impact dominance over the local emission is observed in CO2 and CH4 during all the seasons. Analysis using MODIS fire count data, Concentration Weighted Trajectory (CWT) and FLEXPART have reconfirmed the combined effect of local and long-range transport impacts on the observed concentrations. Comparison of the IASI MetOp and AIRS satellite data products with surface measurements showed the significant bias and poor representation of the seasonality demonstrating the limitations on the sensitivity of satellite trace gas measurements within the boundary layer. © 2021 Elsevier Ltd
关键词	CH4 CO CO2 CWT FLEXPART GHG
语种	英语
scopus关键词	Boundary layers; Cobalt; Greenhouse gases; Rural areas; Surface measurement; Tropics; CH$-4$; CO; Concentration weighted trajectory; Dry air; FLEXPART; Greenhouses gas; Local emissions; Long range transport; Rural site; Seasonality; Carbon dioxide; carbon dioxide; carbon monoxide; methane; AIRS; carbon dioxide; comparative study; concentration (composition); emission; IASI; long range transport; methane; MetOp; MODIS; rural area; satellite data; tropical region; Article; circadian rhythm; concentration (parameter); controlled study; human; human experiment; India; pollution transport; priority journal; rural area; seasonal variation; time series analysis; trend study; tropics; Gadanki; India; Tamil Nadu
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248434
作者单位	National Atmospheric Research Laboratory (NARL), Gadanki517 112, India
推荐引用方式 GB/T 7714	Jain C.D.,Singh V.,Akhil Raj S.T.,et al. Local emission and long-range transport impacts on the CO, CO2, and CH4 concentrations at a tropical rural site[J],2021,254.
APA	Jain C.D.,Singh V.,Akhil Raj S.T.,Madhavan B.L.,&Ratnam M.V..(2021).Local emission and long-range transport impacts on the CO, CO2, and CH4 concentrations at a tropical rural site.ATMOSPHERIC ENVIRONMENT,254.
MLA	Jain C.D.,et al."Local emission and long-range transport impacts on the CO, CO2, and CH4 concentrations at a tropical rural site".ATMOSPHERIC ENVIRONMENT 254(2021).