Friction in mid‐latitude cyclones: an Ekman‐PV mechanism
Friction in mid‐latitude cyclones: an Ekman‐PV mechanism
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中纬度气旋中的摩擦：Ekman-PV 机制
DOI：
10.1002/asl2.526
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发表时间：
2015
影响因子：
3
通讯作者：
R. S. Plant
中科院分区：
文献类型：
--
作者：
I. Boutle;Stephen E. Belcher;R. S. Plant
研究了大气边界层减弱中纬度气旋强度的机制。结果表明，两种替代理论，埃克曼泵和斜压位涡（PV）机制，实际上是联合行动，以最大限度地减少自旋。Ekman抽吸有助于PV从边界层的通风，并将所产生的PV异常塑造成增加的静态稳定性。PV反演技术被用来证明这种异常如何减少气旋内上层和下层之间的耦合，从而降低增长率。
The mechanism by which the atmospheric boundary layer reduces the intensity of mid‐latitude cyclones is investigated. It is demonstrated that two alternative theories, Ekman pumping and the baroclinic potential vorticity (PV) mechanism, in fact act in union to maximize the spin‐down. Ekman pumping aids the ventilation of PV from the boundary layer, and shapes the resulting PV anomaly into one of increased static stability. PV inversion techniques are used to demonstrate how this anomaly reduces the coupling between the upper‐ and lower‐levels within the cyclone, reducing the growth rate.