Quasi‐geostrophic diagnosis of the influence of vorticity advection on the development of upper level jet‐front systems
Quasi‐geostrophic diagnosis of the influence of vorticity advection on the development of upper level jet‐front systems
复制标题
涡度平流对高空急流锋系统发展影响的准地转诊断
DOI：
10.1002/qj.2333
复制
发表时间：
2014
影响因子：
8.9
通讯作者：
Jonathan E. Martin
中科院分区：
文献类型：
--
作者：
Jonathan E. Martin
采用将地转涡度划分为切变分量和曲率分量来考虑在理想化和观测情况下差分涡度平流对西北风流中高层急流锋面系统发展的影响。分析表明，热风产生的负地转切变涡度平流与气旋切变中的地转冷空气平流区域密不可分，迫使沉降分布在沿着上部斜压区暖边缘排列的狭窄、准线性、锋面尺度带中。在所研究的每种情况下，准地转（QG）沉降的这一组成部分对上部锋生倾斜的贡献最大。
A partition of the geostrophic vorticity into shear and curvature components is employed to consider the influence of differential vorticity advection on the development of upper level jet‐front systems in northwesterly flow in an idealized and an observed case. The analysis reveals that negative geostrophic shear vorticity advection by the thermal wind, inextricably coincident with regions of geostrophic cold air advection in cyclonic shear, forces subsidence that is distributed in narrow, quasi‐linear, frontal‐scale bands aligned along the warm edge of the upper baroclinic zone. In each case examined, this component of the quasi‐geostrophic (QG) subsidence makes the largest contribution to upper frontogenetic tilting.