Role of regional wetland emissions in atmospheric methane variability
Role of regional wetland emissions in atmospheric methane variability
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DOI：
10.1002/2016gl070649
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发表时间：
2016-11-01
影响因子：
5.2
通讯作者：
Chipperfield, M. P.
中科院分区：
文献类型：
--
作者：
McNorton, J.;Gloor, E.;Chipperfield, M. P.
大气甲烷 (CH4) 约占长寿命温室气体直接人为辐射强迫总量的 20%。表面观测显示 CH4 增长出现暂停（1999 年至 2006 年），随后又恢复，这在很大程度上仍无法解释。我们利用地表模型估算了 1993 年至 2014 年湿地 CH4 排放量，并研究了区域对大气 CH4 变化的贡献。使用这些排放以及其他来源进行的大气模型模拟与地面和卫星 CH4 数据进行了很好的比较。模拟的全球湿地排放量每年变化+/- 3%（西格玛 = 4.8 Tg），主要是由于降水引起的湿地面积变化，但综合效应对 1999 年至 2006 年 CH4 增长暂停的影响很小。温度升高导致湿地面积增加，导致湿地 CH4 排放量的长期趋势为每年 +0.2%（1999 年至 2014 年）。 2006年后增长的部分原因是湿地排放量增加（+3%），主要来自热带亚洲、南部非洲和澳大利亚。
Atmospheric methane (CH4) accounts for similar to 20% of the total direct anthropogenic radiative forcing by long-lived greenhouse gases. Surface observations show a pause (1999-2006) followed by a resumption in CH4 growth, which remain largely unexplained. Using a land surface model, we estimate wetland CH4 emissions from 1993 to 2014 and study the regional contributions to changes in atmospheric CH4. Atmospheric model simulations using these emissions, together with other sources, compare well with surface and satellite CH4 data. Modeled global wetland emissions vary by +/- 3%/ yr (sigma = 4.8 Tg), mainly due to precipitation-induced changes in wetland area, but the integrated effect makes only a small contribution to the pause in CH4 growth from 1999 to 2006. Increasing temperature, which increases wetland area, drives a long-term trend in wetland CH4 emissions of +0.2%/yr (1999 to 2014). The increased growth post-2006 was partly caused by increased wetland emissions (+3%), mainly from Tropical Asia, Southern Africa, and Australia.