Evaluating Global Atmospheric Inversions of Terrestrial Net Ecosystem Exchange CO2 Over North America on Seasonal and Sub-Continental Scales

Yu Yan Cui, Li Zhang, Andrew R. Jacobson, Matthew S. Johnson, Sajeev Philip, David Baker, Frederic Chevallier, Andrew E. Schuh, Junjie Liu, Sean Crowell, Hélène E. Peiro, Feng Deng, Sourish Basu, Kenneth J. Davis

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Atmospheric inversion estimates of net ecosystem exchange (NEE) of CO2 are increasingly relevant to climate policy. We evaluated sub-continental, seasonal estimates of CO2 NEE from nine global inversion systems that participated in the Orbiting Carbon Observatory-2 model intercomparison project (OCO-2 v9 MIP), using 98 research flights conducted over the central and eastern United States from 2016 to 2018 as part of the Atmospheric Carbon and Transport - America mission. We found that the seasonal amplitude of NEE in the central and eastern United States is underestimated in these models and model-data biases are largest for those inversions with the smallest seasonal flux amplitudes. These results were independent of whether the inversions used satellite or in situ data. The largest NEE biases were observed in the Midwest croplands and eastern forests. Future experiments are needed to determine the causes of the persistent biases and if they are associated with biases in annual flux estimates.

Original languageEnglish (US)
Article numbere2022GL100147
JournalGeophysical Research Letters
Volume49
Issue number18
DOIs
StatePublished - Sep 28 2022

All Science Journal Classification (ASJC) codes

  • Geophysics
  • General Earth and Planetary Sciences

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