Reexamining the Dynamics of Short-Scale, Diabatic Rossby Waves and Their Role in Midlatitude Moist Cyclogenesis
Reexamining the Dynamics of Short-Scale, Diabatic Rossby Waves and Their Role in Midlatitude Moist Cyclogenesis
复制标题
重新审视短尺度、非绝热罗斯贝波的动力学及其在中纬度湿气旋发生中的作用
DOI：
10.1175/1520-0469(2004)061
复制
发表时间：
2004
影响因子：
3.1
通讯作者：
M. Montgomery
中科院分区：
文献类型：
--
作者：
R. Moore;M. Montgomery
作为对爆发性气旋生成的物理过程进行更全面研究的一个步骤，本文用一个二维半地转模式和一个现在标准的潜热释放参数化来诊断在Eady基本状态的湿斜压大气中短尺度非绝热正模的结构、能量学和传播特性。当重新考虑无粘问题时，发现当使用潜热释放的垂直廓线时，短波截止消失，并且对于短于约1900 km的纬向波长，增长率变得与纬向波长无关。不稳定的短尺度模式，以前确定为非绝热Rossby波，欠它们的存在，连续生成的位涡的湿过程与暖空气平流，上升运动，潜热释放。为了确定这些短尺度的非绝热Rossby波模式是否会继续以小的速度增长。
Abstract As a step toward a more comprehensive study of the physical processes that underlie explosive cyclogenesis, a two-dimensional, semigeostrophic model with a now standard parameterization of latent heat release is used to diagnose the structure, energetics, and propagation characteristics of short-scale, diabatic normal modes in a moist, baroclinic atmosphere with the Eady basic state. Upon revisiting the inviscid problem, it is found that when a thermodynamically consistent vertical profile of latent heat release is used, the short-wave cutoff vanishes, and growth rates become independent of zonal wavelength for zonal wavelengths shorter than approximately 1900 km. The destabilized short-scale modes, identified previously as diabatic Rossby waves, owe their existence to the continuous generation of potential vorticity by moist processes associated with warm air advection, rising motion, and latent heat release. To determine if these short-scale, diabatic Rossby wave modes continue to grow at small...