Collaborative Research: New insights into the Holocene methane budget from dual isotope systematics and a high resolution record of the interpolar gradient

0520470摘要这是来自俄勒冈州州立大学和宾夕法尼亚州州立大学的主要研究者的合作提案。 在该项目期间，他们将评估全新世大气甲烷负荷的趋势、机制和来源。他们的方法将包括对以前从格陵兰岛回收的冰芯进行详细采样，并进行建模实验，以记录全新世以及全新世早期、8.2 ka事件、过去5,000年（拟议的人为输入时期）和过去200年等关键时期的长期趋势。使用特定的甲烷同位素，建模和比较极地梯度随着时间的推移将允许更准确地确定极地冰芯中存档的大气甲烷浓度的来源和原因。这进一步分析极间的甲烷梯度，大概是由较大的北方半球来源控制，预计将揭示通过全新世不断变化的甲烷来源。

Abstract for 0520470 This is a collaborative proposal by Principal Investigators from the Oregon State University and Pennsylvania State University. During this project, they will evaluate trends, mechanisms and sources of atmospheric methane loading through the Holocene. Their approach will include a detailed sampling of previously recovered ice cores from Greenland and modeling experiments to document long-term trends in the Holocene as well as during critical periods such as the early Holocene, the 8.2 ka event, the last 5,000 years (a period of proposed anthropogenic input), and the last 200 years. The use of specific methane isotopes, modeling, and comparison of interpolar gradients through time will allow more accurate determination of sources and causes of atmospheric methane concentrations archived in polar ice cores. This further analysis of the interpolar methane gradient, presumably controlled by larger northern hemisphere sources, is anticipated to shed light on changing methane sources through the Holocene.