Constructing the first D/H record of atmospheric methane covering the last two centuries.

0125900 Sowers该奖项支持一个项目，以提高对控制CH 4排放的地球化学过程的理解。 冰中甲烷浓度的记录告诉我们大气负荷随时间的变化。 然而，这些记录并不提供关于个别源或汇的资料。 一种方法来完善我们对生物活性痕量气体（如甲烷）循环的理解，是使用冰芯中捕获气体的稳定同位素记录。 该项目将测量南极洲西普尔穹浅冰/新近冰（覆盖过去~ 200年）中捕获的甲烷的氘/氢（D/H）比。 拟议的工作将补充当前测量冰芯中甲烷碳13同位素比的工作，并将提供有关过去200年大气甲烷各种来源和汇的基本信息。

0125900SowersThis award supports a project to improve the understanding of the biogeochemical processes that control CH4 emissions. Records of the concentration of methane in trapped gases in ice tell us about changes in atmospheric loading through time. Such records do not, however, provide information on the individual sources or sinks. One way to refine our understanding of the cycling of bioactive trace gases like methane is to use stable isotope records of trapped gases in ice cores. This project will measure the Deuterium/Hydrogen (D/H) ratio of methane trapped in shallow/recent ice (covering the last ~ 200 years) at Siple Dome, Antarctica. The proposed work will complement current efforts to measure the carbon-13 isotope ratio of methane in ice cores and will provide fundamental information on the various sources and sinks of atmospheric methane over the last 200 years.