Collaborative Research: Studies of Trapped Gases in Firn and Ice from Antarctic Deep Ice Cores

该奖项旨在支持一项计划，该计划对甲烷浓度、古大气氧的氧同位素组成以及南极深部冰芯的总气体含量的变化进行高分辨率研究。 对南极冰盖冰层空气浓度和同位素组成的研究也将继续进行。 这项工作的一个目标是利用冰中空气中的甲烷浓度和氧同位素组成作为时间地层标记，用于格陵兰岛和南极冰芯的精确相互关联以及冰芯与其他气候记录的关联。 第二个目标是利用格陵兰岛和南极冰芯测量的甲烷浓度和半球间梯度的变化来推断大气甲烷分布所依赖的大陆气候和生物地球化学的变化。 第三个目标是利用 Siple Dome 冰芯中总气体含量变化的数据来重建西南极洲在末次盛冰期期间的冰川历史。 第四个目标是参与东方、Siple Dome 和南极的冰雪空气化学合作研究，这将产生许多有关冰中气体捕获的新信息，以及过去 100 年来温室气体、氧气、痕量生物气体和痕量人为气体的浓度历史和同位素组成。

This award is for support for a program to make high resolution studies of variations in the concentration of methane, the oxygenisotope composition of paleoatmospheric oxygen, and the total gas content of deep Antarctic ice cores. Studies of the concentration and isotopic composition of air in the firn of the Antarctic ice sheet will also be continued. One objective of this work is to use the methane concentration and oxygen-isotope composition of oxygen of air in ice as time-stratigraphic markers for the precise intercorrelation of Greenland and Antarctic ice cores as well as the correlation of ice cores to other climatic records. A second objective is to use variations in the concentration and interhemispheric gradient of methane measured in Greenland and Antarctic ice cores to deduce changes in continental climates and biogeochemistry on which the atmospheric methane distribution depends. A third objective is to use data on the variability of total gas content in the Siple Dome ice core to reconstruct aspects of the glacial history of West Antarctica during the last glacial maximum. The fourth objective is to participate in collaborative studies of firn air chemistry at Vostok, Siple Dome, and South Pole which will yield much new information about gas trapping in ice as well as the concentration history and isotopic composition of greenhouse gases, oxygen, trace biogenic gases and trace anthropogenic gases during the last 100 years.