THE EFFECT OF SPATIALLY NONUNIFORM HEATING ON THE FORMATION AND VARIATION OF SUB TROPICAL HIGH Ⅰ. SCALE ANALYSIS

Based upon the complete form of vertical vorticity tendency equation, the effect of spatially no nuniform heating on the formation and variation of subtropical high is discussed in this study. By using simple scale analysis, it is found that, compared with horizontal nonuniform heating, vertical nonuniform heating has stronger impacts on the formation of enclosed subtropical anticyclone centers. In a steady state, the β-effect and horizontal advection play different roles at different levels in forming the configuration of subtropical anticyclone. Due to these effects, low level subtropical anticyclone center appears on the western side of surface sensible heating and eastern side of deep condensation heating, whereas upper level subtropical anticy clone center appears on the eastern side of surface sensible heating and western side of deep condensation heating.