气候变化领域集成服务门户(CCPortal): Was Australia a sink or source of CO2in 2015? Data assimilation using OCO-2 satellite measurements

CCPortal

DOI	10.5194/acp-21-17453-2021
	Was Australia a sink or source of CO2in 2015? Data assimilation using OCO-2 satellite measurements
	Villalobos Y.; Rayner P.J.; Silver J.D.; Thomas S.; Haverd V.; Knauer J.; Loh Z.M.; Deutscher N.M.; Griffith D.W.T.; Pollard D.F.
发表日期	2021
ISSN	1680-7316
起始页码	17453
结束页码	17494
卷号	21 期号:23
英文摘要	In this study, we present the assimilation of data from the Orbiting Carbon Observatory-2 (OCO-2) (land nadir and glint data, version 9) to estimate the Australian carbon surface fluxes for the year 2015. To perform this estimation, we used both a regional-scale atmospheric transport-dispersion model and a four-dimensional variational assimilation scheme. Our results suggest that Australia was a carbon sink of -0.41±0.08PgCyr-1 compared to the prior estimate 0.09±0.20PgCyr-1 (excluding fossil fuel emissions). Most of the carbon uptake occurred in northern Australia over the savanna ecotype and in the western region over areas with sparse vegetation. Analysis of the enhanced vegetation index (EVI) suggests that the majority of the carbon uptake over the savanna ecosystem was due to an increase of vegetation productivity (positive EVI anomalies) amplified by an anomalous increase of rainfall in summer. Further from this, a slight increase of carbon uptake in Western Australia over areas with sparse vegetation (the largest ecosystem in Australia) was noted due to increased land productivity in the area caused by positive rainfall anomalies. The stronger carbon uptake estimate in this ecosystem was partially due to the land surface model (CABLE-BIOS3) underestimating the gross primary productivity of the ecosystem. To evaluate the accuracy of our carbon flux estimates from OCO-2 retrievals, we compare our posterior concentration fields against the column-averaged carbon retrievals from the Total Carbon Column Observing Network (TCCON) and ground-based in situ monitoring sites located around our domain. The validation analysis against TCCON shows that our system is able to reduce bias mainly in the summer season. Comparison with surface in situ observations was less successful, particularly over oceanic monitoring sites that are strongly affected by oceanic fluxes and subject to less freedom by the inversion. For stations located far from the coast, the comparison with in situ data was more variable, suggesting difficulties matching the column-integrated and surface data by the inversion, most likely linked to model vertical transport. Comparison of our fluxes against the OCO-2 model intercomparison (MIP) was encouraging. The annual carbon uptake estimated by our inversion falls within the ensemble of the OCO-2 MIP global inversions and presents a similar seasonal pattern. © 2021 Yohanna Villalobos et al.
语种	英语
scopus关键词	atmospheric chemistry; carbon dioxide; carbon flux; carbon sink; data assimilation; satellite imagery; seasonal variation; Australia
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/246407
作者单位	School of Geography, Earth and Atmospheric Sciences, University of Melbourne, Melbourne, Australia; ARC Centre of Excellence for Climate Extremes, Sydney, Australia; Climate and Energy College, University of Melbourne, Melbourne, Australia; School of Mathematics and Statistics, University of Melbourne, Melbourne, Australia; CSIRO Oceans and Atmosphere, Canberra, Australia; CSIRO Oceans and Atmosphere, Aspendale, VIC, Australia; Centre for Atmospheric Chemistry, School of Chemistry, University of Wollongong, Wollongong, NSW 2522, Australia; National Institute of Water and Atmospheric Research Ltd (NIWA) Lauder, New Zealand
推荐引用方式 GB/T 7714	Villalobos Y.,Rayner P.J.,Silver J.D.,et al. Was Australia a sink or source of CO2in 2015? Data assimilation using OCO-2 satellite measurements[J],2021,21(23).
APA	Villalobos Y..,Rayner P.J..,Silver J.D..,Thomas S..,Haverd V..,...&Pollard D.F..(2021).Was Australia a sink or source of CO2in 2015? Data assimilation using OCO-2 satellite measurements.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(23).
MLA	Villalobos Y.,et al."Was Australia a sink or source of CO2in 2015? Data assimilation using OCO-2 satellite measurements".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.23(2021).