空间非均匀加热对副热带高压形成和变异的影响Ⅱ:陆面感热与东太平洋副高

THE EFFECT OF SPATIALLY NONUNIFORM HEATING ON THE FORMATION AND VARIATION OF SUBTROPICAL HIGH PART Ⅱ:LAND SURFACE SENSIBLE HEATING AND EAST PACIFIC SUBTROPICAL HIGH

摘要: 在文献4尺度分析的基础上,通过对NCEP/NCAR月平均资料的分析,并利用IAP/LASGGOALS全球气候模式进行模拟和试验,研究了东太平洋北美地区副热带高压主体的形成及变化规律.基于全型垂直涡度方程的诊断分析指出,北美陆地的表面感热通量是决定该地区副热带高压中心位置及其季节变化的关键因素.数值模拟和敏感性试验进一步表明,夏半年陆面感热加热是导致1000hPa太平洋副热带高压及500hPa北美副热带高压形成和变化的最重要原因.

Abstract: Based on the scale analysis,the formation and seasonal variation of the East Pacific North America (PNA) subtropical high are investigated by using NCEP/NCAR monthly mean data and the Global Ocean-Atmosphere-Land System model of IAP/LASG (IAP/LASG GOALS).The data analysis based on the complete form of vertical vorticity equation shows that the land surface sensible heating over North America is very important for the formation and seasonal variation of the PNA subtropical high.This conclusion is further supported by numerical simulation and sensitive experiments of the IAP/LASG GOALS.