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

9522173博萨特和奈特 根据该奖项，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调节和控制这些事件中所起的作用进行观测和建模研究。 作为这项研究的一部分，PI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，安第斯山脉与大陆东海岸之间的距离几乎是线性变化的。 这可能允许PI将地形和海岸对上述过程的影响分开。 这些研究的结果可能会为更好地了解世界其他地区的冷空气爆发提供重要见解，包括美国。 该研究的观测部分将包括对南美洲冷空气爆发的复合气候学的分析和对个案的详细研究，主要使用业务中心作为再分析工作的一部分产生的网格数据集。 数值模拟将使用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). ***