Constructing a 200,000-year Atmospheric N2O Record from the GISP II Ice Core

该奖项旨在支持一项研究，该研究旨在从格陵兰冰盖计划2 （GISP2）冰芯中被遮挡的空气包裹中构建20万年的大气中氧化亚氮（N2O）浓度记录。该记录将提供冰期/间冰期氮生物地球化学循环的信息。空气中一氧化二氮的浓度是由全球范围内这种气体的源和汇决定的。对源（陆地和海洋生物圈）和汇（平流层的光解作用）的估计目前还没有得到很好的限制，但据认为，陆地生物圈贡献了全球氧化亚氮排放的80%左右，另外20%由海洋贡献。将大气中氧化亚氮的记录与二氧化碳和甲烷等其他生物活性气体进行比较，将有助于了解过去20万年全球碳循环变化的本质，并将成为一种有用的地层学工具，用于将格陵兰岛和南极洲的冰芯联系起来。＊＊＊

9321558 Sowers This award is for support for a study to construct a 200,000 year record of the concentration of nitrous oxide (N2O) in the atmosphere from the occluded air parcels in the Greenland Ice Sheet Project Two (GISP2) ice core. This record will provide information on nitrogen biogeochemical cycles over glacial/interglacial time periods. The concentration of nitrous oxide in air is determined by the sources and sinks of this gas on a global scale. Estimates of the sources (terrestrial and marine biospheres) and sinks (photodissociation in the stratosphere) are not presently well constrained but the terrestrial biosphere is thought to contribute about 80 % of the global nitrous oxide emissions with the other 20 % being made up from an oceanic contribution. Comparing an atmospheric nitrous oxide record with other bioactive gases such as carbon dioxide and methane will help in understanding the nature of changes in global carbon cycling throughout the past 200,000 years and will be a useful stratigraphic tool for correlating Greenland and Antarcitc ice cores. ***