Long and Medium-Term Research: Cirrus Cloud Studies With a Counterflow Virtual Impactor

Long&Amp；中期研究：使用逆流虚拟撞击器的卷云研究这个奖项是在外国卓越中心的长期和中期研究计划下获得的，这使得美国科学家和工程师能够在国外被证明是卓越的研究中心进行为期三到十二个月的研究。该项目的奖项提供了联合研究的机会，并提供了使用国外独特或互补的设施、专业知识和实验条件的机会。该奖项将支持西奥多·L·安德森博士为期12个月的博士后研究访问，与斯德哥尔摩大学的Jost Heintzenberg教授合作。逆流虚拟冲击器(CVI)是一种成熟的液体水流星收集装置。与其他云水收集器不同，CVI应该在卷云(冰)云中表现得同样好，允许收集微物理数据，这可能有助于解决卷云在温室气体导致的气候变暖中起到正反馈或负反馈等基本问题。该项目的一个关键目标将是确定和开发一种控制CVI收集大型水流星的方法。其他目标包括(A)改进整个CVI采样和分析系统，以降低冷凝水和水流星数浓度的检测下限，以及(B)优化适用于低压卷云环境的所有仪器。奖励建议提供了国际旅费、为期12个月的津贴和家属津贴。

Long & Medium-Term Research: Cirrus Cloud Studies with a Counterflow Virtual Impactor This award is under the Long and Medium-Term Research at Foreign Centers of Excellence Program, which enables U.S. scientists and engineers to conduct three to twelve months of research abroad at research centers of proven excellence. The program's awards provide opportunities for joint research, and the use of unique or complementary facilities, expertise and experimental conditions abroad. This award will support an twelve-month postdoctoral research visit by Dr. Theodore L. Anderson to work with Professor Jost Heintzenberg of Stockholm University. The Counterflow Virtual Impactor (CVI) is a well-established device for collecting liquid hydrometeors. Unlike other cloud water collectors, the CVI should perform equally well in cirrus (ice) clouds, allowing microphysical data to be collected which could help to resolve such fundamental questions as whether cirrus act as a positive or negative feedback in greenhouse-gas-induced climatic warming. A key goal of this project will be to characterize and develop a method of controlling the collection of large hydrometeors by the CVI. Other goals include (a) improving the overall CVI sampling and analysis system so as to lower the detection limits for both condensed water and hydrometeor number concentration and (b) optimizing all instruments for the low pressure cirrus environment. The award recommendation provides funds to cover international travel, a stipend for twelve months and a dependents' allowance.