南海地区赤道辐合带的动力学与能量学特征分析
ANALYSIS ON SOME DYNAMIC AND ENERGY FEATURES OF THE ITCZ AROUND SOUTH CHINA SEA
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摘要: 本文利用三角形区域法,对南海地区ITCZ的21个个例分析计算了有关动力学特征量随高度的分布,从而得出了平均的结果,这与蒋全荣和余志豪(1984)的分析结论基本一致。分析还发现在平均和分类情况下,南海地区ITCZ的高层(约300hpa)可能有一个相对的干燥层或“干盖”存在。能量学特征的计算表明,南海地区的ITCZ低层具有大量水汽、潜热和全能量的水平辐合,然后垂直向上输送并在高层向副热带地区水平辐散开去。因此,它在热带大气环流能量、水汽等方面的传输过程中起着重要的作用。Abstract: In this paper, distribution of mean results of some dynamic features with height is described, it is consistent with Jiang and Yu (1984). Maybe there exists a relatively dry layer in the higher level (about 300hPa) of the ITCZ around the South China Sea. Calculation shows the large horizontal convergence of vapour and latent heat and energy (K+H+Lq) in the lower level, they transport upward,then into the subtropical region in the higher level. The ITCZ plays an important role in the transportation of energy and vapour of tropical circulation.
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