Reactive Gas Chemistry in the Dome C Snowpack and its Influence on Surface Layer Chemistry and Ice Core Records

这项美法合作旨在进一步了解雪和雪中发生的光化学过程，以及它们可能对积雪和极地大气之间的表面交换产生的影响。这些过程可能会影响南极大陆上空大气中微量气体的组成。在这个~1+季节的过程中，将在Dome C的大气下10m处寻找臭氧、氮氧化物（NOx）、CO以及选定的碳氢化合物的垂直和时间解析记录。还将进行遮阳扰动实验，以研究间隙积雪空气中光化学氧化剂的光化学转化。在Summit（格陵兰）进行的类似测量将为比较提供基础，并进一步完善描述我们对极地冰盖中积雪-大气化学循环的理解的物理和化学积雪模型。通过提供CU研究生研究项目的核心，这一努力促进了国际研究联系。

This US-French collaboration seeks to further our understanding of the photochemical processes taking place in snow and firn, and the influences they may have on surface exchange between snowpack and the polar atmosphere. Such processes potentially impact the atmospheric composition of trace gases over the Antarctic continent. Vertically and temporally resolved records of ozone, nitrogen oxides (NOx), CO as well as selected hydrocarbons in the lower 10m of the atmosphere at Dome C will be sought over the course of this ~1+ season. Shading perturbation experiments will also be undertaken to investigate photochemical transformations of photochemical oxidants in interstitial snowpack air. Similar measurements that have been made at Summit (Greenland) will provide a basis for comparison, and a further refinement of a physical and chemical snowpack model depicting our understanding of snowpack-atmosphere chemical cycling in polar ice sheets. By providing the core of a CU graduate student research project, this effort fosters international research connections.