Unusual characteristics of the carbon cycle during the 2015-2016 El Niño

Unusual characteristics of the carbon cycle during the 2015-2016 El Niño

© 2021 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 27(2021), 16 vom: 01. Aug., Seite 3798-3809
1. Verfasser: Wang, Kai (VerfasserIn)
Weitere Verfasser: Wang, Xuhui, Piao, Shilong, Chevallier, Frédéric, Mao, Jiafu, Shi, Xiaoying, Huntingford, Chris, Bastos, Ana, Ciais, Philippe, Xu, Hao, Keeling, Ralph F, Pacala, Stephen W, Chen, Anping
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2021
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article CO2 seasonal-cycle amplitude (SCA) El Niño atmospheric CO2 growth rate (CGR) net biome productivity (NBP) northern terrestrial ecosystems soil water deficit Carbon Dioxide 142M471B3J Carbon 7440-44-0
Beschreibung
Zusammenfassung:© 2021 John Wiley & Sons Ltd.
The 2015-2016 El Niño was one of the strongest on record, but its influence on the carbon balance is less clear. Using Northern Hemisphere atmospheric CO2 observations, we found both detrended atmospheric CO2 growth rate (CGR) and CO2 seasonal-cycle amplitude (SCA) of 2015-2016 were much higher than that of other El Niño events. The simultaneous high CGR and SCA were unusual, because our analysis of long-term CO2 observations at Mauna Loa revealed a significantly negative correlation between CGR and SCA. Atmospheric inversions and terrestrial ecosystem models indicate strong northern land carbon uptake during spring but substantially reduced carbon uptake (or high emissions) during early autumn, which amplified SCA but also resulted in a small anomaly in annual carbon uptake of northern ecosystems in 2015-2016. This negative ecosystem carbon uptake anomaly in early autumn was primarily due to soil water deficits and more litter decomposition caused by enhanced spring productivity. Our study demonstrates a decoupling between seasonality and annual carbon cycle balance in northern ecosystems over 2015-2016, which is unprecedented in the past five decades of El Niño events
Beschreibung:Date Completed 06.08.2021
Date Revised 06.08.2021
published: Print-Electronic
Citation Status MEDLINE
ISSN:1365-2486
DOI:10.1111/gcb.15669