气候变化领域集成服务门户(CCPortal): Evaluation of CarbonTracker's Inverse Estimates of North American Net Ecosystem Exchange of CO2 From Different Observing Systems Using ACT-America Airborne Observations

CCPortal

DOI	10.1029/2020JD034406
	Evaluation of CarbonTracker's Inverse Estimates of North American Net Ecosystem Exchange of CO2 From Different Observing Systems Using ACT-America Airborne Observations
	Cui Y.Y.; Jacobson A.R.; Feng S.; Wesloh D.; Barkley Z.R.; Zhang L.; Gerken T.; Keller K.; Baker D.; Davis K.J.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:12
英文摘要	Quantification of regional terrestrial carbon dioxide (CO2) fluxes is critical to our understanding of the carbon cycle. We evaluate inverse estimates of net ecosystem exchange (NEE) of CO2 fluxes in temperate North America, and their sensitivity to the observational data used to drive the inversions. Specifically, we consider the state-of-the-science CarbonTracker global inversion system, which assimilates (a) in situ measurements (IS), (b) the Orbiting Carbon Observatory-2 (OCO-2) v9 column CO2 (XCO2) retrievals over land (LNLG), (c) OCO-2 v9 XCO2 retrievals ocean-glint (OG), and (d) a combination of all these observational constraints (LNLGOGIS). We use independent CO2 observations from the Atmospheric Carbon and Transport (ACT)—America aircraft mission to evaluate the inversions. We diagnose errors in the flux estimates using the differences between modeled and observed biogenic CO2 mole fractions, influence functions from a Lagrangian transport model, Bayesian inference, and root-mean-square error (RMSE) and bias metrics. The IS fluxes have the smallest RMSE among the four products, followed by LNLG. Both IS and LNLG outperform the OG and LNLGOGIS inversions with regard to RMSE. Regional errors do not differ markedly across the four sets of posterior fluxes. The CarbonTracker inversions appear to overestimate the seasonal cycle of NEE in the Midwest and Western Canada, and overestimate dormant season NEE across the Central and Eastern US. The CarbonTracker inversions may overestimate annual NEE in the Central and Eastern US. The success of the LNLG inversion with respect to independent observations bodes well for satellite-based inversions in regions with more limited in situ observing networks. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Aircraft campaign; biogenic CO2 fluxes; regional evaluation
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/237169
作者单位	Department of Meteorology and Atmospheric Science, The Pennsylvania State University, University ParkPA, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States; NOAA Earth System Research Laboratory, Global Monitoring Laboratory, Boulder, CO, United States; Now at Atmospheric Sciences & Global Change Division, Pacific Northwest National Laboratory, Richland, WA, United States; Now at School of Integrated Sciences, James Madison University, Harrisonburg, VA, United States; Department of Geosciences, The Pennsylvania State University, University ParkPA, United States; Earth and Environmental Systems Institute, The Pennsylvania State University, University ParkPA, United States; Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO, United States
推荐引用方式 GB/T 7714	Cui Y.Y.,Jacobson A.R.,Feng S.,et al. Evaluation of CarbonTracker's Inverse Estimates of North American Net Ecosystem Exchange of CO2 From Different Observing Systems Using ACT-America Airborne Observations[J],2021,126(12).
APA	Cui Y.Y..,Jacobson A.R..,Feng S..,Wesloh D..,Barkley Z.R..,...&Davis K.J..(2021).Evaluation of CarbonTracker's Inverse Estimates of North American Net Ecosystem Exchange of CO2 From Different Observing Systems Using ACT-America Airborne Observations.Journal of Geophysical Research: Atmospheres,126(12).
MLA	Cui Y.Y.,et al."Evaluation of CarbonTracker's Inverse Estimates of North American Net Ecosystem Exchange of CO2 From Different Observing Systems Using ACT-America Airborne Observations".Journal of Geophysical Research: Atmospheres 126.12(2021).