Climate Studies Using Antarctic Deep Ice Cores and Firn Air Samples

该奖项是为了支持一个项目，对甲烷浓度的变化、古大气氧的氧同位素组成和南极深层冰芯的总气体含量进行高分辨率研究。 还将继续研究南极冰盖积雪中空气的浓度和同位素组成。 这项工作的目的之一是使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志，用于格陵兰和南极冰芯的精确相互关联以及冰芯与其他气候记录的相关性。 第二个目标是利用在格陵兰和南极冰芯中测得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末次盛冰期西南极洲冰川历史的各个方面。 第四个目标是参与在东方，Siple Dome和南极的积雪空气化学的合作研究，这将产生许多新的信息，气体捕获在冰以及浓度的历史和同位素组成的温室气体，氧气，微量生物源气体和微量人为气体在过去的100年。

This award is for support for a program to make high resolution studies of variations in the concentration of methane, the oxygen- isotope 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.