U.S.-France Cooperative Research: Nitrogen and Sulfur Cycles in Antarctica Inferred from Concentration and Isotopic Measurements

0128971蒂蒙斯这个为期三年的美国-法国南极洲地球化学研究合作奖涉及马克H。蒂蒙斯和圣地亚哥加州大学的学生以及法国格勒诺布尔国家科学研究中心冰川学和物理环境实验室的米歇尔·勒格朗和罗伯特·德尔马斯。 他们将使用气体浓度和硫、氮和氧同位素测量的组合来研究南极洲大气硫和氮的循环。 将采用多同位素比测量和质量独立同位素化学的整合。具体而言，法国南极站的硫和氮物种将使用气体浓度，气溶胶，粒度分布和成分，以及同位素比测量进行研究。 还将研究目前储存在法国的东方号冰芯中捕获的离子种类的浓缩和同位素测量。 美国研究人员为这次合作带来了冰分析方面的专业知识。 此外，法国还拥有冰芯化学方面的专门知识，并可利用法国南极研究设施和特殊冰芯。对南极冰芯的研究将促进对南极大气、臭氧消耗和气候转变原因的了解。该奖项代表了美国方面向NSF和CNRS提出的平行建议。 NSF将为美国研究人员和学生提供旅费和生活费。CNRS将支持法国研究人员访问美国。

0128971ThiemensThis three-year award for US-France collaboration on biogeochemical studies in Antarctica involves Mark H. Thiemens and students at the University of California at San Diego and Michel Legrand and Robert Delmas of the Glaciology and Physical Environment Laboratory (CNRS, Grenoble, France). They will study atmospheric sulfur and nitrogen cycles in Antarctica using gas concentration and a combination of sulfur, nitrogen and oxygen isotopic measurements. Multi-isotope ratio measurement and integration of mass independent isotopic chemistry will be employed. Specifically, sulfur and nitrogen species at the French Antarctic station will be studied using gas concentration, aerosols, size distribution, and composition in addition to isotopic ratio measurements. Concentrated and isotopic measurements of ionic species trapped in the Vostok ice cores, currently in stored in France, also will be investigated. The US researchers bring to this collaboration expertise in ice analysis. This is complemented by French expertise in ice core chemistry and access to French Antarctic research facilities and special ice cores. Studies of Antarctic ice cores will advance understanding of the Antarctic atmosphere, ozone depletion, and the causes of climate transition. This award represents the US side of parallel proposals to the NSF and the CNRS. NSF will cover travel funds and living expenses for the US investigators and students. The CNRS will support visits by French researchers to the United States.