低纬大气环流季节转换及青藏高原非绝热加热作用的天气统计学分析
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作者单位
章基嘉  
王盘兴  
孙照渤  
陈松军  
中文摘要:本文用天气学方法分析了1979年5~7月低纬逐候100、500、1000毫巴层平均环流,得到该年低纬大气环流由冬入夏的季节转换发生在6月第2候到第4候的结论。用自然正交展开方法分解各层候平均流场序列,得到的第二特征向量是表征环流季节转换的重要分量,称它为季风分量。对青藏高原加热作用与第二特征向量时间系数的统计学分析表明,两者存在显著的相关联系;而对第二特征向量的散度场和垂直运动场的天气学分析表明,两者的显著相关是由高原及其邻近区域与低纬之间的若个垂直环流圈联系的。
 
SYNOPTIC AND STATISTICAL ANALYSIS OF THE SEASONAL TRANSFORMATION OF THE LOW-LATITUDE ATMOSPHERIC CIRCULATION AND THE EFFECT OF DIABATIC HEATING BY THE QINGHAI-XIZANG PLATEAU
Abstract:A synoptic analysis is made of the low-latitude pentad mean circulation at 100, 500, and 1000 mb from May through July of 1979, with the conclusion that the seasonal transformation of the low-latitude atmospheric circulation from winter to summer of that year occurred in the time between the second pentad and the fourth one of June. The second characteristic vector obtained from the solution of the arrays of the pentad mean flow field in the diffenent layers by the method of natural orthogonal expansion is an important component characterizing the seasonal transformation of the circulation and is called the monsoon component. The statistical analysis of the heating effect of the Qinghai-Xizang Plateau and the time coefficient of the second characteristic vector shows that there exists an obvious correlation between them. And it is found from the synoptic analysis of the diffusivity field and vertical motion field of the second vector that the correlation is due to the vertical circulation cells over the region between the Plateau and its neighbourhood, and the low latitudes.
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