期刊
SCIENCE
卷 328, 期 5986, 页码 1686-1689出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1187651
关键词
-
资金
- German Secretary of Education and Research
- Deutsche Forschungsgemeinschaft (DFG)
- Schweizerischer Nationalfonds (SNF)
- European Research Council
- Denmark (SNF)
- Belgium (FNRS-CFB)
- France (IFRTP)
- France (INSU/CNRS)
- Germany (AWI)
- Iceland (RannIs)
- Japan (MEXT)
- Sweden (SPRS)
- Switzerland (SNF)
- United States (NSF)
The causes of past changes in the global methane cycle and especially the role of marine methane hydrate (clathrate) destabilization events are a matter of debate. Here we present evidence from the North Greenland Ice Core Project ice core based on the hydrogen isotopic composition of methane [delta D(CH4)] that clathrates did not cause atmospheric methane concentration to rise at the onset of Dansgaard-Oeschger (DO) events 7 and 8. Box modeling supports boreal wetland emissions as the most likely explanation for the interstadial increase. Moreover, our data show that delta D(CH4) dropped 500 years before the onset of DO 8, with CH4 concentration rising only slightly. This can be explained by an early climate response of boreal wetlands, which carry the strongly depleted isotopic signature of high-latitude precipitation at that time.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据