气候变化领域集成服务门户(CCPortal): Quantification of Enhancement in Atmospheric CO2 Background Due to Indian Biospheric Fluxes and Fossil Fuel Emissions

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DOI	10.1029/2021JD034545
	Quantification of Enhancement in Atmospheric CO2 Background Due to Indian Biospheric Fluxes and Fossil Fuel Emissions
	Halder S.; Tiwari Y.K.; Valsala V.; Sreeush M.G.; Sijikumar S.; Janardanan R.; Maksyutov S.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:13
英文摘要	Regional carbon emissions impact global atmospheric carbon dioxide (CO2) background concentrations. This study quantified the enhancement in the atmospheric CO2 mole fractions due to biospheric and fossil fuel fluxes from India. Sensitivity experiments using model simulations were conducted, allowing CO2 enhancement due to biospheric and fossil fuel fluxes from India to diffuse into the global atmospheric background. The areal extent of column-averaged enhancement of 0.2 ppm and above due to Indian fluxes are spread over a larger area covering the Indian subcontinent, neighboring Asian regions, and the north Indian Ocean in all four seasons. The boundary layer CO2 enhancement due to biospheric fluxes (fossil fuel fluxes) have a maximum range of −2.6 to +1.4 ppm (1.8–2.0 ppm) most time of the year. At higher altitude, the amplitudes of enhancement are reduced from ±1.8 to ±0.6 ppm as we go up from 850 to 500 hPa due to diffusion by prevailing atmospheric dynamics and convection. With the information of the areal extent of >0.2 ppm CO2 enhancement due to Indian fluxes, we have evaluated the representativeness of satellite observations (GOSAT and OCO-2) in capturing those enhancements. Both the satellite coverage show a similar number of observations (0.1 per day) during all seasons except for June to August, wherein the cloud screening eliminates almost all the satellite data over the region. Within this areal extent, the satellite XCO2 shows average anomalies of nearly ±2.0 ppm; it is a valuable piece of information because it is well above the retrieval uncertainty, yet capturing the potential enhancement due to fluxes from India. The study implies that the regions of enhancement greater than 0.2 ppm can be considered locations for surface observations representing Indian fluxes. Similarly, the region with enhancement greater than one ppm could be covered by satellites/airborne observations to discern enhancement in the atmospheric CO2 mole fractions due to Indian fluxes. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	atmospheric CO2 enhancement; Indian biospheric fluxes; Indian fossil fuel emissions; XCO2 enhancement over India
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/237141
作者单位	Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, India; Department of Atmospheric and Space Sciences, Savitribai Phule Pune University, Pune, India; Centre for Climate Physics, Institute for Basic Science, Busan, South Korea; Pusan National University, Busan, South Korea; Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, India; Satellite Observation Center, Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Japan
推荐引用方式 GB/T 7714	Halder S.,Tiwari Y.K.,Valsala V.,et al. Quantification of Enhancement in Atmospheric CO2 Background Due to Indian Biospheric Fluxes and Fossil Fuel Emissions[J],2021,126(13).
APA	Halder S..,Tiwari Y.K..,Valsala V..,Sreeush M.G..,Sijikumar S..,...&Maksyutov S..(2021).Quantification of Enhancement in Atmospheric CO2 Background Due to Indian Biospheric Fluxes and Fossil Fuel Emissions.Journal of Geophysical Research: Atmospheres,126(13).
MLA	Halder S.,et al."Quantification of Enhancement in Atmospheric CO2 Background Due to Indian Biospheric Fluxes and Fossil Fuel Emissions".Journal of Geophysical Research: Atmospheres 126.13(2021).