Tropical methane emissions explain large fraction of recent changes in global atmospheric methane growth rate.

Tropical methane emissions explain large fraction of recent changes in global atmospheric methane growth rate.
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DOI:
10.1038/s41467-022-28989-z
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发表时间:
2022-03-16
影响因子:
16.6
通讯作者:
Liu Y
Liu Y
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Feng L;Palmer PI;Zhu S;Parker RJ;Liu Y

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大气甲烷是一种主要的温室气体,其增长变化很大,这是由各种各样的人为和自然排放以及羟基自由基氧化损失造成的。我们使用了长达十年的甲烷卫星观测数据集(2010-2019),表明热带陆地排放解释了这一时期全球大气甲烷增长率观察到的80%以上的变化。使用相关的气象分析,我们表现出很强的季节性相关性(r = 0.6-0.8)在热带海洋的大尺度海洋表面温度的变化和区域变化的甲烷排放量(通过降雨和温度的变化)在热带南美洲和热带非洲。因此,现有的海洋表面温度变化预测技术可以用来帮助预测全球大气甲烷的变化。甲烷是一种强大的温室气体,其排放量难以控制。作者使用了10年的卫星观测数据,表明热带陆地排放占观测到的全球甲烷增加量的80%。
Large variations in the growth of atmospheric methane, a prominent greenhouse gas, are driven by a diverse range of anthropogenic and natural emissions and by loss from oxidation by the hydroxyl radical. We used a decade-long dataset (2010–2019) of satellite observations of methane to show that tropical terrestrial emissions explain more than 80% of the observed changes in the global atmospheric methane growth rate over this period. Using correlative meteorological analyses, we show strong seasonal correlations (r = 0.6–0.8) between large-scale changes in sea surface temperature over the tropical oceans and regional variations in methane emissions (via changes in rainfall and temperature) over tropical South America and tropical Africa. Existing predictive skill for sea surface temperature variations could therefore be used to help forecast variations in global atmospheric methane. Methane is a powerful greenhouse gas with emissions that are challenging to constrain. Here the authors use 10 years of satellite observations and show tropical terrestrial emissions account for 80% of observed global methane increases.
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