Recent decrease of the impact of tropical temperature on the carbon cycle linked to increased precipitation
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The atmospheric CO2 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 CO2 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.
Originalsprog | Engelsk |
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Artikelnummer | 965 |
Tidsskrift | Nature Communications |
Vol/bind | 14 |
Udgave nummer | 1 |
Antal sider | 9 |
ISSN | 2041-1723 |
DOI | |
Status | Udgivet - 2023 |
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© 2023. The Author(s).
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