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

中长期研究：基于逆流虚拟冲击器的卷云研究本奖项隶属于国外卓越中心中长期研究项目。它使美国科学家和工程师能够在国外公认的卓越研究中心进行三到十二个月的研究。该计划的奖励为联合研究提供了机会，并利用独特或互补的设施、专业知识和国外的实验条件。该奖项将支持Theodore L. Anderson博士与斯德哥尔摩大学Jost Heintzenberg教授进行为期12个月的博士后研究访问。逆流虚拟冲击器（CVI）是一种成熟的收集液态水成物的装置。与其他云水收集器不同，CVI在卷云（冰）云中表现同样出色，允许收集微物理数据，帮助解决诸如卷云在温室气体引起的气候变暖中是正反馈还是负反馈等基本问题。该项目的一个关键目标将是描述和开发一种控制CVI收集大型水成物的方法。其他目标包括(a)改进整体CVI采样和分析系统，以降低冷凝水和水成物数浓度的检出限；(b)优化低压卷云环境的所有仪器。奖励建议提供国际旅费、12个月津贴和受扶养人津贴。

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.