气候变化领域集成服务门户(CCPortal): The impact of improved satellite retrievals on estimates of biospheric carbon balance

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DOI	10.5194/acp-20-323-2020
	The impact of improved satellite retrievals on estimates of biospheric carbon balance
	Miller S.M.; Michalak A.M.
发表日期	2020
ISSN	1680-7316
起始页码	323
结束页码	331
卷号	20 期号:1
英文摘要	The Orbiting Carbon Observatory 2 (OCO-2) is NASA's first satellite dedicated to monitoring CO2 from space and could provide novel insight into CO2 fluxes across the globe. However, one continuing challenge is the development of a robust retrieval algorithm: an estimate of atmospheric CO2 from satellite observations of near-infrared radiation. The OCO-2 retrievals have undergone multiple updates since the satellite's launch, and the retrieval algorithm is now on its ninth version. Some of these retrieval updates, particularly version 8, led to marked changes in the CO2 observations, changes of 0.5 ppm or more. In this study, we evaluate the extent to which current OCO-2 observations can constrain monthly CO2 sources and sinks from the biosphere, and we particularly focus on how this constraint has evolved with improvements to the OCO-2 retrieval algorithm. We find that improvements in the CO2 retrieval are having a potentially transformative effect on satellite-based estimates of the global biospheric carbon balance. The version 7 OCO-2 retrievals formed the basis of early inverse modeling studies using OCO-2 data; these observations are best equipped to constrain the biospheric carbon balance across only continental or hemispheric regions. By contrast, newer versions of the retrieval algorithm yield a far more detailed constraint, and we are able to constrain CO2 budgets for seven global biome-based regions, particularly during the Northern Hemisphere summer when biospheric CO2 uptake is greatest. Improvements to the OCO-2 observations have had the largest impact on glint-mode observations, and we also find the largest improvements in the terrestrial CO2 flux constraint when we include both nadir and glint data. © 2020 Author(s).
语种	英语
scopus关键词	algorithm; biosphere; carbon balance; carbon dioxide; carbon flux; carbon sink; environmental monitoring; Northern Hemisphere; satellite data
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141620
作者单位	Department of Environmental Health and Engineering, Johns Hopkins University, Baltimore, MD, United States; Department of Global Ecology, Carnegie Institution for Science, Stanford, CA, United States
推荐引用方式 GB/T 7714	Miller S.M.,Michalak A.M.. The impact of improved satellite retrievals on estimates of biospheric carbon balance[J],2020,20(1).
APA	Miller S.M.,&Michalak A.M..(2020).The impact of improved satellite retrievals on estimates of biospheric carbon balance.Atmospheric Chemistry and Physics,20(1).
MLA	Miller S.M.,et al."The impact of improved satellite retrievals on estimates of biospheric carbon balance".Atmospheric Chemistry and Physics 20.1(2020).