Five years of variability in the global carbon cycle: comparing an estimate from the Orbiting Carbon Observatory-2 and process-based models
نویسندگان
چکیده
Abstract Year-to-year variability in CO 2 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 geostatistical inverse model to evaluate 5 interannual (IAV) its relationships with environmental drivers. OCO-2 launched late 2014, specifically IAV during time period when are available. We then compare inferences state-of-the-art process-based models (terrestrial biosphere model, TBMs). Results suggest that tropical grasslands biome (including grasslands, savanna, agricultural lands within tropics) makes contributions year study comparable forests, result differs majority TBMs. Furthermore, existing studies disagree on variables drive period, analysis using suggests both temperature precipitation make contributions. TBMs, by contrast, tend estimate larger usually relative extra-tropics. With said, TBMs show little consensus magnitude different regions IAV. further find wide range responses annual anomalies precipitation, these across most have than inferred OCO-2. Overall, findings highlight large uncertainties estimates recent provide an avenue evaluating processes against
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ژورنال
عنوان ژورنال: Environmental Research Letters
سال: 2021
ISSN: ['1748-9326']
DOI: https://doi.org/10.1088/1748-9326/abfac1