A Modeling and Observational Study of South American Cold Air Damming and Frontogenesis East of the Andes

9522173博萨特和奈特根据这一奖项，博萨特和奈特博士将对南美冷空气爆发以及安第斯山脉在这些事件的调制和控制中所起的作用进行观测和模拟研究。作为这项研究的一部分，派·S将研究安第斯山脉屏障的存在如何影响天气和中尺度气旋生成、反气旋生成和锋生过程。与北美或澳大利亚东南部的主要山脉屏障不同，安第斯山脉和大陆东海岸之间的距离随着纬度的变化几乎是线性的。这可能使私人投资者指数能够区分地形和海岸对上述过程的影响。这些研究的结果可能会为更好地了解包括美国在内的世界其他地区的冷空气爆发提供重要的见解。这项研究的观测部分将包括对南美洲冷空气爆发的综合气候学分析和对个别病例的详细研究，主要使用运营中心生成的网格数据集作为再分析工作的一部分。数值模拟将用NCAR中尺度模式(MM5)进行。***

9522173 Bosart and Knight Under this award, Drs. Bosart and Knight will conduct an observational and modeling study of South American cold air outbreaks and the role that the Andes Mountains play in the modulation and control of these events. As part of this study, the PI s will examine how the presence of the Andes barrier affects the processes of synoptic and mesoscale cyclogenesis, anticyclogenesis, and frontogenesis. Unlike the major mountain barriers of North America or southeastern Australia, the distance, with latitude, between the Andes and the east coast of the continent varies almost linearly. This may allow the PIs to separate orographic and coastal effects on the above processes. The results of these studies is likely to provide important insights for better understanding cold air outbreaks in other parts of the world, including over the U.S. The observational portion of the study will consist of analyses of composite climatologies of cold air outbreaks over South America and detailed studies of individual cases, using primarily the gridded data sets being produced by operational centers as part of the reanalysis effort. The numerical simulations will be done with the NCAR mesoscale model (MM5). ***