edu.ucar.opensky::articles:26873 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T18:59:52.879892 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7r49vv9 https://doi.org/10.26024/BZNE-YF09 https Related Dataset #1 CESM2.2-CAM6 Perturbed Parameter Ensemble (PPE) https://doi.org/10.26024/bzne-yf09 https Related Dataset #2 CESM2.2-CAM6 Perturbed Parameter Ensemble (PPE) Neutral tropical African CO2 exchange estimated from aircraft and satellite observations 2023-12-01T00:00:00Z publication https://n2t.org/ark:/85065/d7r49vv9 https://doi.org/10.1029/2023GB007804 Gaubert, Benjamin author Stephens, Britton author Baker, D. F. author Basu, S. author Bertolacci, M. author Bowman, K. W. author Buchholz, Rebecca author Chatterjee, A. author Chevallier, F. author Commane, R. author Cressie, N. author Deng, F. author Jacobs, N. author Johnson, M. S. author Maksyutov, S. S. author McKain, K. author Liu, J. author Liu, Z. author Morgan, E. author O'Dell, C. author Philip, S. author Ray, E. author Schimel, D. author Schuh, A. author Taylor, T. E. author Weir, B. author van Wees, D. author Wofsy, S. C. author Zammit-Mangion, A. author Zeng, N. author UCAR/NCAR - Library publisher Tropical lands play an important role in the global carbon cycle yet their contribution remains uncertain owing to sparse observations. Satellite observations of atmospheric carbon dioxide (CO2) have greatly increased spatial coverage over tropical regions, providing the potential for improved estimates of terrestrial fluxes. Despite this advancement, the spread among satellite-based and in-situ atmospheric CO2 flux inversions over northern tropical Africa (NTA), spanning 0-24 degrees N, remains large. Satellite-based estimates of an annual source of 0.8-1.45 PgC yr(-1) challenge our understanding of tropical and global carbon cycling. Here, we compare posterior mole fractions from the suite of inversions participating in the Orbiting Carbon Observatory 2 (OCO-2) Version 10 Model Intercomparison Project (v10 MIP) with independent in-situ airborne observations made over the tropical Atlantic Ocean by the National Aeronautics and Space Administration (NASA) Atmospheric Tomography (ATom) mission during four seasons. We develop emergent constraints on tropical African CO2 fluxes using flux-concentration relationships defined by the model suite. We find an annual flux of 0.14 +/- 0.39 PgC yr(-1) (mean and standard deviation) for NTA, 2016-2018. The satellite-based flux bias suggests a potential positive concentration bias in OCO-2 B10 and earlier version retrievals over land in NTA during the dry season. Nevertheless, the OCO-2 observations provide improved flux estimates relative to the in situ observing network at other times of year, indicating stronger uptake in NTA during the wet season than the in-situ inversion estimates. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2023 American Geophysical Union. None eng geoscientificInformation