Large-Scale Controls of Methanogenesis Inferred from Methane and Gravity Spaceborne Data
Large-Scale Controls of Methanogenesis Inferred from Methane and Gravity Spaceborne Data
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DOI：
10.1126/science.1175176
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发表时间：
2010-01-15
期刊：
影响因子：
56.9
通讯作者：
Frankenberg, Christian
中科院分区：
文献类型：
--
作者：
Bloom, A. Anthony;Palmer, Paul I.;Frankenberg, Christian
湿地是甲烷（CH 4）最大的单个来源，但在大陆尺度上对这一来源的规模和分布知之甚少。我们隔离的湿地和水稻稻田的贡献，在2003-2005年的卫星观测重力异常，代理地下水位深度伽玛，和表面温度分析T-S的空间CH 4测量。我们发现，热带和高纬度CH 4的变化主要是由伽马和T-S变化，分别描述。我们的工作表明，热带湿地贡献了全球排放量的52%至58%，其余来自热带以外地区，其中2%来自北极纬度。我们估计，由于中纬度和北极湿地地区的变暖，2003-2007年湿地甲烷排放量增加了7%，我们发现这与最近大气甲烷的变化是一致的。
Wetlands are the largest individual source of methane (CH4), but the magnitude and distribution of this source are poorly understood on continental scales. We isolated the wetland and rice paddy contributions to spaceborne CH4 measurements over 2003-2005 using satellite observations of gravity anomalies, a proxy for water-table depth Gamma, and surface temperature analyses T-S. We find that tropical and higher-latitude CH4 variations are largely described by Gamma and T-S variations, respectively. Our work suggests that tropical wetlands contribute 52 to 58% of global emissions, with the remainder coming from the extra-tropics, 2% of which is from Arctic latitudes. We estimate a 7% rise in wetland CH4 emissions over 2003-2007, due to warming of mid-latitude and Arctic wetland regions, which we find is consistent with recent changes in atmospheric CH4.