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Numerical and Dynamical Analyses of Heat Source Forcing and Restricting Subtropical High Activity


doi: 10.1007/s00376-000-0043-4

  • By using the numerical and dynamical methods, the influence and restriction of the heat source forcing on the subtropical geopotential fields and flow fields are studied and discussed in a model atmosphere. The main results show that the zonal symmetrical solar radiation heating chiefly induces the geopotential field changing gradually and leads the subtropical high moving slowly, but when the zonal asymmetric thermal difference between ocean and continent achieves its critical value, which usually causes the geopotential field a catastrophe, and consequently induces the subtropical high shake-up or jump. The abnormal activity of the subtropical high is possibly caused by the abnormality of the thermal factor.
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Manuscript History

Manuscript received: 10 January 2000
Manuscript revised: 10 January 2000
通讯作者: 陈斌, bchen63@163.com
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Numerical and Dynamical Analyses of Heat Source Forcing and Restricting Subtropical High Activity

  • 1. Department of Atmospheric Science; Nanjing University; Nanjing 210093,Department of Atmospheric Science; Nanjing University; Nanjing 210093

Abstract: By using the numerical and dynamical methods, the influence and restriction of the heat source forcing on the subtropical geopotential fields and flow fields are studied and discussed in a model atmosphere. The main results show that the zonal symmetrical solar radiation heating chiefly induces the geopotential field changing gradually and leads the subtropical high moving slowly, but when the zonal asymmetric thermal difference between ocean and continent achieves its critical value, which usually causes the geopotential field a catastrophe, and consequently induces the subtropical high shake-up or jump. The abnormal activity of the subtropical high is possibly caused by the abnormality of the thermal factor.

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