ENSO-driven reverse coupling in interannual variability of pantropical water availability and global atmospheric CO2 growth rate
ENSO-driven reverse coupling in interannual variability of pantropical water availability and global atmospheric CO2 growth rate
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DOI：
10.1088/1748-9326/ab66cc
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发表时间：
2020-02
影响因子：
6.7
通讯作者：
A. Zhang;G. Jia
中科院分区：
文献类型：
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作者：
A. Zhang;G. Jia
全球大气CO2增长率的年际变化主要源于泛热带陆地生态系统吸收CO2的变化，这种变化与厄尔尼诺-南方涛动（ENSO）调制的水资源和温度变化的气候波动有关。然而，厄尔尼诺/南方涛动的作用，在调节区域的整体水供应年际变化的贡献，水供应的CO2耦合的阶段和强度仍然受到限制，在功能多样的泛热带陆地生态系统。利用1998 - 2016年的卫星微波和地下水可用性以及混合良好的全球大气CO2浓度观测，研究了水可用性-CO2年际变化的耦合及其与ENSO的关系。结果表明，ENSO、水资源可利用性和全球大气CO2增长率之间存在因果关系，ENSO与水资源可利用性之间的相关性的相位和强度决定了水资源可利用性-CO2耦合的相位和强度，揭示了ENSO驱动下的水资源可利用性-CO2耦合的鲁棒性和反向性。此外，热带雨林，稀树草原和灌丛主导的泛热带水分有效性的变化，并表现出较强的耦合强度。因此，强烈的年际变化的大气CO2的增长率源于ENSO驱动的频繁变化的水的可用性和随后并发的碳吸收泛热带雨林，稀树草原，和灌丛。研究结果为理解和预测基于ENSO及其可预测性的水可利用性和CO2增长率的年际变化提供了新的见解。
The large interannual variability of global atmospheric CO2 growth rate originates primarily from variation in carbon dioxide (CO2) uptake of pantropical terrestrial ecosystems, which covaries with the El Niño–Southern Oscillation (ENSO) modulated climate fluctuations of water availability and temperature change. However, the role of ENSO in modulating the contributions of regional to overall water availability interannual variability, and the phase and strength of water availability-CO2 coupling remain poorly constrained across functionally diverse pantropical terrestrial ecosystems. Using satellite microwave and ground water availability and well-mixed global atmospheric CO2 concentration observations, the coupling in interannual variability of water availability-CO2 and their relationship with ENSO was investigated from 1998 to 2016. The results demonstrated causal sequence of ENSO, water availability, and global atmospheric CO2 growth rate, the phase and magnitude of water availability-CO2 coupling was primarily determined by phase and strength of correlation between ENSO and water availability, revealing ENSO-driven robust and reverse coupling of water availability-CO2. Moreover, tropical rainforests, savannas, and shrublands dominated the pantropical water availability variations and showed stronger coupling strength. Therefore, the strong interannual variability of atmospheric CO2 growth rate originates from ENSO-driven frequent variations of water availability and the subsequently concurrent carbon uptake over pantropical rainforests, savannas, and shrublands. The findings provided new insights to understand and predict interannual variability of water availability and CO2 growth rate based on ENSO and its predictability.