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

摘要0520523这是俄勒冈州立大学和宾夕法尼亚州立大学的首席研究人员共同提出的建议。在这个项目中，他们将评估整个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，并进行模拟实验，以记录全新世以及关键时期的长期趋势，如全新世早期、8.2ka事件、过去5000年(拟议的人为输入时期)和最近200年。使用特定的甲烷同位素、建模和比较随时间变化的极间梯度将能够更准确地确定极地冰芯中大气甲烷浓度的来源和原因。这种对极间甲烷梯度的进一步分析，可能是由更大的北半球来源控制的，预计将有助于揭示整个全新世甲烷来源的变化。

Abstract for 0520523This 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.