RUI: Heavy Precipitation Over Eastern North America: Synoptic Climatology and Associated Diabatic Feedbacks

[707443 . Lackmann]该项目的最终目标是深入了解强降水事件（HPE）之前和伴随的大尺度大气流动模式。HPE在这里被定义为降水量超过24小时季节平均降雨量两个标准差的事件。如果能够确定与这些事件相关的特征流型，就可以获得有关非绝热加热和降水过程及其反馈的新见解。这些信息反过来又可以作为数值预报模式中更好地参数化物理的基础。首席研究员通过对加拿大西部HPE的初步研究获得了一些有希望的结果。这项研究将调查美国东北部的HPE，主要是在寒冷的季节。他的分析将包括从准地转位涡角度诊断这些事件的综合研究和案例研究，并将研究水分输送在HPE演变中的作用。该奖项是美国国家科学基金会本科院校研究活动的一部分。拉克曼博士将让几名本科生直接参与他的研究。

9707443 Lackmann The ultimate goal of this project is to gain insights into the large-scale atmospheric flow patterns that precede and accompany heavy precipitation events (HPE). HPE's are here defined as those events where precipitation exceeds the average 24 hour seasonal rainfall totals by two standard deviations. If characteristic flow patterns associated with such events can be identified , new insights about the diabatic heating and precipitation processes and feedbacks involved may be obtained. This information, in turn, could serve as the basis for better parameterization of the physics in numerical forecast models. The principal investigator has obtained some promising results with a preliminary study of HPE's over western Canada. This study will examine HPE's in the northeastern part of the U.S., principally in the cold season. His analyses will involve both composite and case studies of these events diagnosed from a quasi-geostrophic potential vorticity perspective and will examine the role of moisture transports in the evolution of HPE's. This award is part of NSF's Research in Undergraduate Institutions activity. Dr. Lackmann will involve several undergraduates directly in his research.