@article{21e10fa6df1d4479b2fc419cb774f382,
title = "Evaluating Global Atmospheric Inversions of Terrestrial Net Ecosystem Exchange CO2 Over North America on Seasonal and Sub-Continental Scales",
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.",
author = "Cui, {Yu Yan} and Li Zhang and Jacobson, {Andrew R.} and Johnson, {Matthew S.} and Sajeev Philip and David Baker and Frederic Chevallier and Schuh, {Andrew E.} and Junjie Liu and Sean Crowell and Peiro, {H{\'e}l{\`e}ne E.} and Feng Deng and Sourish Basu and Davis, {Kenneth J.}",
note = "Funding Information: The ACT‐America project is a NASA Earth Venture Suborbital 2 project funded by NASA's Earth Science Division. The authors would like to acknowledge the NASA grants: NNX15AG76G to Penn State and NNX15AJ07G to Colorado State, and the support for the OCO‐2 v9 flux model inter‐comparison project provided through NASA grant #80 NSSC 18K0909, and NASA{\textquoteright}s Carbon Monitoring System (80NSSC21K1060). MJ acknowledges the internal funding from NASA's Earth Science Research and Analysis Program. The authors also would like to acknowledge NASA's Earth System Science Pathfinder Program Office, NASA's Airborne Sciences Program, NASA's Atmospheric Science Data Center, and NASA's Pleiades supercomputing facilities. Publisher Copyright: {\textcopyright} 2022. American Geophysical Union. All Rights Reserved.",
year = "2022",
month = sep,
day = "28",
doi = "10.1029/2022GL100147",
language = "English (US)",
volume = "49",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "18",
}
