气候变化领域集成服务门户(CCPortal): The impacts of fossil fuel emission uncertainties and accounting for 3-D chemical CO2production on inverse natural carbon flux estimates from satellite and in situ data

CCPortal

DOI	10.1088/1748-9326/ab9795
	The impacts of fossil fuel emission uncertainties and accounting for 3-D chemical CO2production on inverse natural carbon flux estimates from satellite and in situ data
	Wang J.S.; Oda T.; Kawa S.R.; Strode S.A.; Baker D.F.; Ott L.E.; Pawson S.
发表日期	2020
ISSN	17489318
卷号	15 期号:8
英文摘要	Atmospheric carbon dioxide (CO2) inversions for estimating natural carbon fluxes typically do not allow for adjustment of fossil fuel CO2 emissions, despite significant uncertainties in emission inventories and inadequacies in the specification of international bunker emissions in inversions. Also, most inversions place CO2 release from fossil fuel combustion and biospheric sources entirely at the surface. However, a non-negligible portion of the emissions actually occurs in the form of reduced carbon species, which are eventually oxidized to CO2 downwind. Omission of this 'chemical pump' can result in a significant redistribution of the inferred total carbon fluxes among regions. We assess the impacts of different prescriptions of fossil fuel emissions and accounting for the chemical pump on flux estimation, with a novel aspect of conducting both satellite CO2 observation-based and surface in situ-based inversions. We apply 3-D carbon monoxide (CO) loss rates archived from a state-of-the-art GEOS chemistry and climate model simulation in a forward transport model run to simulate the distribution of CO2 originating from oxidation of carbon species. We also subtract amounts from the prior surface CO2 fluxes that are actually emitted in the form of fossil and biospheric CO, methane, and non-methane volatile organic compounds (VOCs). We find that the posterior large-scale fluxes are generally insensitive to the finer-scale spatial differences between the ODIAC and CDIAC fossil fuel CO2 gridded datasets and assumptions about international bunker emissions. However, accounting for 3-D chemical CO2 production and the surface correction shifts the global carbon sink, e.g. from land to ocean and from the tropics to the north, with a magnitude and even direction that depend on assumptions about the surface correction. A GOSAT satellite-based inversion is more sensitive to the chemical pump than one using in situ observations, exhibiting substantial flux impacts of 0.28, 0.53, and -0.47 Pg C yr-1 over tropical land, global land, and oceans, due to differences in the horizontal and vertical sampling of the two observation types. Overall, the biases from neglecting the chemical pump appear to be minor relative to the flux estimate uncertainties and the differences between the in situ and GOSAT inversions, but their relative importance will grow in the future as observational coverage further increases and satellite retrieval biases decrease. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	atmospheric chemistry; carbon cycle; carbon dioxide; fossil fuel emissions; inverse modeling; remote sensing
语种	英语
scopus关键词	Atmospheric chemistry; Biospherics; Carbon dioxide; Carbon monoxide; Climate models; Large dataset; Methane; Pumps; Satellites; Tropics; Uncertainty analysis; Volatile organic compounds; Atmospheric carbon dioxide; Climate model simulations; Emission inventories; Fossil fuel combustion; Fossil fuel emissions; Horizontal and vertical samplings; In-situ observations; Non-methane volatile organic compounds; Fossil fuels; carbon dioxide; carbon emission; carbon flux; carbon monoxide; emission inventory; flux measurement; fossil fuel; GOSAT; in situ measurement; land-sea interaction; satellite data; uncertainty analysis; volatile organic compound
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153887
作者单位	Goddard Earth Science Technology and Research, Universities Space Research Association, Columbia, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO, United States; Now at the Institute for Advanced Sustainability Studies, Potsdam, Germany
推荐引用方式 GB/T 7714	Wang J.S.,Oda T.,Kawa S.R.,et al. The impacts of fossil fuel emission uncertainties and accounting for 3-D chemical CO2production on inverse natural carbon flux estimates from satellite and in situ data[J],2020,15(8).
APA	Wang J.S..,Oda T..,Kawa S.R..,Strode S.A..,Baker D.F..,...&Pawson S..(2020).The impacts of fossil fuel emission uncertainties and accounting for 3-D chemical CO2production on inverse natural carbon flux estimates from satellite and in situ data.Environmental Research Letters,15(8).
MLA	Wang J.S.,et al."The impacts of fossil fuel emission uncertainties and accounting for 3-D chemical CO2production on inverse natural carbon flux estimates from satellite and in situ data".Environmental Research Letters 15.8(2020).