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Five years of variability in the global carbon cycle: comparing an estimate from the Orbiting Carbon Observatory-2 and process-based models

Chen, Z.; Huntzinger, D. N.; Liu, J.; Piao, S.; Wang, X.; Sitch, S.; Friedlingstein, P.; Anthoni, P. 1; Arneth, A. 1; Bastrikov, V.; Goll, D. S.; Haverd, V.; Jain, A. K.; Joetzjer, E.; Kato, E.; Lienert, S.; Lombardozzi, D. L.; Mcguire, P. C.; Melton, J. R.; ... mehr

Abstract:
Year-to-year variability in CO2 fluxes can yield insight into climate-carbon cycle relationships, a fundamental yet uncertain aspect of the terrestrial carbon cycle. In this study, we use global observations from NASA's Orbiting Carbon Observatory-2 (OCO-2) satellite for years 2015–2019 and a geostatistical inverse model to evaluate 5 years of interannual variability (IAV) in CO2 fluxes and its relationships with environmental drivers. OCO-2 launched in late 2014, and we specifically evaluate IAV during the time period when OCO-2 observations are available. We then compare inferences from OCO-2 with state-of-the-art process-based models (terrestrial biosphere model, TBMs). Results from OCO-2 suggest that the tropical grasslands biome (including grasslands, savanna, and agricultural lands within the tropics) makes contributions to global IAV during the 5 year study period that are comparable to tropical forests, a result that differs from a majority of TBMs. Furthermore, existing studies disagree on the environmental variables that drive IAV during this time period, and the analysis using OCO-2 suggests that both temperature and precipitation make comparable contributions. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000133572
Veröffentlicht am 03.06.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1748-9318, 1748-9326
KITopen-ID: 1000133572
HGF-Programm 12.11.21 (POF IV, LK 01) Human impact on land - climate dynamics
Erschienen in Environmental Research Letters
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 16
Heft 5
Seiten Art.-Nr.: 054041
Nachgewiesen in Scopus
Web of Science
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