Baroclinic Wave-Packet Dynamics in Low-Level Confluent/Diffluent Flow as a Mechanism for Tropical Cyclogenesis

9312655，Pi-Montgomery，“作为热带气旋发生机制的低层汇流/分流中的斜压波包动力学”：在早期的研究中，主要研究者研究了高层位涡扰动和低层扰动的相互作用，作为热带气旋启动的可能机制。虽然这一机制似乎在亚热带地区很重要，但尚不清楚它是否也适用于深热带地区。根据这一奖项，蒙哥马利博士将使用三维半地转模式，模拟和诊断干燥和潮湿中性大气中正压汇流/分流(基本对应于副高边界上的流动)中斜压波包的气旋发生势。这项研究将试图模拟热带东风波进入汇合或分流区域的过程。此外，他还将讨论其他可能的升力机制，如切变流动中的贝塔效应和孤立涡。

ABSTRACT: 9312655, PI-Montgomery, "Baroclinic Wave Packet Dynamics in Low Level Confluent/Diffluent Flow as a Mechanism for Tropical Cyclogenesis": In earlier research, the principal investigator investigated the interactions of upper level potential vorticity disturbances and low level disturbances as a possible mechanism for tropical cyclones initiation. While this mechanism appears to be important in the subtropics, it is not clear whether it applies to the deep tropics as well. Under this award, Dr. Montgomery will simulate and diagnose the cyclogenetic potential of baroclinic wave packets in barotropic confluent/diffluent flow (basically corresponding to the flow in the boundaries between subtropical highs) in both dry and moist neutral atmospheres, using a three dimensional semi geostrophic model. The study would attempt to mimic the passage of a tropical easterly wave into a region of confluence or diffluence. In addition, he will other possible lifting mechanisms such as the beta effect and isolated vortices in shear flow.