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

9321558 Sowers该奖项是为了支持一项研究，以建立一个20万年来的一氧化二氮（N2 O）在格陵兰冰盖项目二（GISP 2）冰芯中的闭塞空气包中的浓度记录。 这一记录将提供冰期/间冰期期间氮地球化学循环的信息。 一氧化二氮在空气中的浓度是由全球范围内这种气体的源和汇决定的。 目前对源（陆地和海洋生物圈）和汇（平流层中的光解）的估计没有很好的限制，但陆地生物圈被认为贡献了全球一氧化二氮排放量的80%，另外20%来自海洋贡献。 将大气中的一氧化二氮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20万年来全球碳循环变化的性质，并将成为格陵兰和南极冰芯相关的有用地层工具。 ***

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. ***