Recent decrease of the impact of tropical temperature on the carbon cycle linked to increased precipitation.

Autor: Zhang W; Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark. wenminzhg@gmail.com., Schurgers G; Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark., Peñuelas J; CSIC, Global Ecology Unit CREAF-CEAB-UAB, Cerdanyola del Vallès, 08193, Catalonia, Spain.; CREAF, Cerdanyola del Vallès, 08193, Catalonia, Spain., Fensholt R; Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark., Yang H; Department for Biogeochemical Integration, Max-Planck-Institute for Biogeochemistry, 07745, Jena, Germany., Tang J; Department of Physical Geography and Ecosyste m Science, Lund University, Lund, Sweden.; Department of Biology, University of Copenhagen, Copenhagen, Denmark., Tong X; Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, China., Ciais P; Laboratoire des Sciences du Climat et de l'Environnement, CEA CNRS UVSQ, Gif-sur-Yvette, France., Brandt M; Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2023 Feb 21; Vol. 14 (1), pp. 965. Date of Electronic Publication: 2023 Feb 21.
DOI: 10.1038/s41467-023-36727-2
Abstrakt: The atmospheric CO 2 growth rate (CGR) variability is largely controlled by tropical temperature fluctuations. The sensitivity of CGR to tropical temperature [Formula: see text] has strongly increased since 1960, but here we show that this trend has ceased. Here, we use the long-term CO 2 records from Mauna Loa and the South Pole to compute CGR, and show that [Formula: see text] increased by 200% from 1960-1979 to 1979-2000 but then decreased by 117% from 1980-2001 to 2001-2020, almost returning back to the level of the 1960s. Variations in [Formula: see text] are significantly correlated with changes in precipitation at a bi-decadal scale. These findings are further corroborated by results from a dynamic vegetation model, collectively suggesting that increases in precipitation control the decreased [Formula: see text] during recent decades. Our results indicate that wetter conditions have led to a decoupling of the impact of the tropical temperature variation on the carbon cycle.
(© 2023. The Author(s).)
Databáze: MEDLINE
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