Observations of Mesoscale Circulations within Extratropical Cyclones over the North Atlantic Ocean during ERICA
Observations of Mesoscale Circulations within Extratropical Cyclones over the North Atlantic Ocean during ERICA
复制标题
ERICA期间北大西洋温带气旋内中尺度环流的观测
DOI：
10.1175/1520-0493(1997)125
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发表时间：
1997
影响因子：
3.2
通讯作者：
F. Roux
中科院分区：
文献类型：
--
作者：
Ching‐Hwang Liu;R. Wakimoto;F. Roux
本文对在海洋上空快速加深的温带气旋中沿暖锋形成的两个中尺度环流(水平尺度为20-40公里)进行了伪双多普勒分析。在ERICA(大西洋气旋快速增强试验)IOP(强化观测期)4期间，利用机载多普勒雷达分析了环流，认为这是一种锋面不稳定类型，过去对锋面波和气旋的理论研究没有涉及到这一类型。这些特征可能是浅层环流，当它们与高空斜压波耦合时，可能在气旋发生中发挥作用。将本文与ERICA IOP5期间唯一一次分析良好的事件进行了对比分析。为了便于解释这些涡旋的动力学结构，利用运动风场进行了扰动压力场和浮力场的反演。此外，还有一组方程式。
Abstract Pseudo-dual-Doppler analyses of two mesoscale circulations (20–40 km in horizontal dimensions) that formed along a warm front within a rapidly deepening extratropical cyclone over the ocean are presented. The circulations were analyzed using airborne Doppler radar during ERICA (Experiment on Rapidly Intensifying Cyclones over the Atlantic) IOP (intensive observing period) 4 and are believed to be a type of frontal instability that has not been addressed in past theoretical studies of frontal waves and cyclones. These features may be the shallow circulations that have been documented to play a role in cyclogenesis when they become coupled with an upper-level baroclinic wave. The present case is compared and contrasted with the only other well-analyzed event during ERICA IOP 5. A retrieval of the perturbation pressure and buoyancy fields using the kinematic wind fields is performed in order to facilitate the interpretation of the dynamic structure of these vortices. In addition, a set of equations ...