空间非均匀加热对副热带高压带形成和变异的影响Ⅰ:尺度分析
THE EFFECT OF SPATIALLY NONUNIFORM HEATING ON THE FORMATION AND VARIATION OF SUB TROPICAL HIGH Ⅰ. SCALE ANALYSIS
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摘要: 利用全型垂直涡度倾向方程,讨论了空间非均匀非绝热加热(Q)对副热带高压形态变异的影响。通过简单的空间尺度分析指出,Q的垂直非均匀分布比其水平非均匀分布对副热带高压带断裂成闭合中心的影响更大。在时间尺度较长时,低空的β效应和高层的涡度平流对副热带高压形态的形成有重要作用。在它们影响下,低空副热带高压出现在表面感热加热西侧、深对流凝结加热东侧;而高空副热带高压出现在表面感热加热的东侧、深对流凝结加热的西侧。Abstract: 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.
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吴国雄,刘还珠.全型垂直涡度倾向方程和倾斜涡度发展.气象学报,1999,57(1):1～15 Hoskins BJ,Karoly D.The steady linear response of a spherical atmosphere to thermal and or ographic forcing.J Atmos Sci,1981,38:1179-1196
Peixoto JP,Oort AH.Physics of Climate.New York:AIP,1991.520pp
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