Influence of El Nino on atmospheric CO2 over the tropical Pacific Ocean: Findings from NASA's OCO-2 mission
Influence of El Nino on atmospheric CO2 over the tropical Pacific Ocean: Findings from NASA's OCO-2 mission
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DOI：
10.1126/science.aam5776
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发表时间：
2017-10-13
期刊：
影响因子：
56.9
通讯作者：
Schimel, D. S.
中科院分区：
文献类型：
--
作者：
Chatterjee, A.;Gierach, M. M.;Schimel, D. S.
利用轨道碳观测站-2的星载二氧化碳观测资料，表征了2015-2016年强厄尔尼诺事件对热带大气二氧化碳浓度的响应。虽然大气CO2浓度增长率与厄尔尼诺-南方涛动之间的相关性是众所周知的，但海洋和陆地碳循环响应的相关性强度和时间在空间和时间上仍然缺乏限制。我们利用天基二氧化碳观测证实，热带太平洋在厄尔尼诺事件期间确实在调节大气二氧化碳浓度变化方面发挥了早期和重要的作用。厄尔尼诺现象是一种推断出来的现象，但由于在热带地区高密度、大范围的二氧化碳观测不足，以前没有观测到这种现象。
Spaceborne observations of carbon dioxide (CO2) from the Orbiting Carbon Observatory-2 are used to characterize the response of tropical atmospheric CO2 concentrations to the strong El Nino event of 2015-2016. Although correlations between the growth rate of atmospheric CO2 concentrations and the El Nino-Southern Oscillation are well known, the magnitude of the correlation and the timing of the responses of oceanic and terrestrial carbon cycle remain poorly constrained in space and time. We used space-based CO2 observations to confirm that the tropical Pacific Ocean does play an early and important role in modulating the changes in atmospheric CO2 concentrations during El Nino events-a phenomenon inferred but not previously observed because of insufficient high-density, broad-scale CO2 observations over the tropics.