Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark.
CSIC, Global Ecology Unit CREAF-CEAB-UAB, Cerdanyola del Vallès, 08193, Catalonia, Spain.
Nat Commun. 2023 Feb 21;14(1):965. doi: 10.1038/s41467-023-36727-2.
The atmospheric CO 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 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.
大气 CO 增长率（CGR）的变化在很大程度上受热带温度波动的控制。自 1960 年以来，CGR 对热带温度的敏感性[Formula: see text]大幅增加，但这里我们表明，这种趋势已经停止。在这里，我们使用莫纳罗亚和南极的长期 CO 记录来计算 CGR，并表明[Formula: see text]从 1960-1979 年到 1979-2000 年增加了 200%，但随后从 1980-2001 年到 2001-2020 年减少了 117%，几乎回到了 20 世纪 60 年代的水平。[Formula: see text]的变化与降水在双十年际尺度上的变化显著相关。动态植被模型的结果进一步证实了这一点，这表明降水的增加控制了近几十年来[Formula: see text]的减少。我们的研究结果表明，更湿润的条件导致了热带温度变化对碳循环的影响的解耦。
