A numerical study of rotating convection during tropical cyclogenesis
A numerical study of rotating convection during tropical cyclogenesis
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DOI：
10.1002/qj.2022
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发表时间：
2013-07
影响因子：
8.9
通讯作者：
G. Kilroy;Roger K. Smith
中科院分区：
文献类型：
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作者：
G. Kilroy;Roger K. Smith
我们提出了理想化的数值模型实验来研究热带低气压中垂直涡度的对流产生。环境垂直涡度由均匀固体旋转表示。这些计算是根据热带云系统抑郁前调查 (PREDICT) 实验期间进行的观察得出的。一个具体目标是分离和量化低到中层干燥空气对低气压内形成的对流单元的影响，特别是对这些单元中垂直涡度产生的影响。结果并不支持一种普遍的看法，即高空干燥空气会产生更强的对流下沉气流和更强烈的冷空气流出。事实上，我们发现高空干燥空气削弱了上升气流和下降气流，证实了詹姆斯和马科夫斯基最近的结果。
We present idealized numerical model experiments to investigate the convective generation of vertical vorticity in a tropical depression. The ambient vertical vorticity is represented by a uniform solid‐body rotation. The calculations are motivated by observations made during the Pre‐Depression Investigation of Cloud‐systems in the Tropics (PREDICT) experiment. A specific aim is to isolate and quantify the effects of low‐ to mid‐level dry air on convective cells that form within a depression and, in particular, on the generation of vertical vorticity in these cells. The results do not support a common perception that dry air aloft produces stronger convective downdraughts and more intense, cold‐air outflows therefrom. Indeed, we find that dry air aloft weakens both updraughts and downdraughts, corroborating the recent results of James and Markowski.