一九八一年初夏东南亚地区大气热源结构及其对经向环流的影响

本文用热力学方程和水汽连续方程计算了东南亚地区1981年初夏的大气热源和水汽汇的分布情况。文章讨论了大气热源的演变与该地区经向垂直环流的相互关系,并讨论了大气热源和经向环流在南海和中南半岛的差异。分析结果表明,经向环流圈与大气冷热源的分布密切相关。东亚季风建立后的大气热源中心在南海北部,热汇区在赤道附近,相应的最大上升气流也出现在南海下沉区主要在赤道南侧,而且南海的经向环流比中南半岛的要强盛的多。大气热源对于经向环流圈的形成和维持有很大的作用。

THE STRUCTURES OF THE ATMOSPHERIC HEAT SOURCES AND THE INFLUENCES OF THE HEAT SOURCES ON THE MERIDIONAL CIRCULATION OVER SOUTH-EAST ASIA IN THE EARLY SUMMER OF 1981

By using the equation of the first law of thermodynamies and the equation of moisture continuity, the distributions of the atmospheric heat sources and the moisture sinks over South-cast Asia in the early summer of 1981 are computed.The relationships between the variation of the atmospheric heat sources and the meridional vertical circulation over this area are analysed and the differences in the atmospheric heat sources and the meridional circulation between the South China Sea and the Indo-China Peninsula are also analysed. It is discovered that, the meridional cell is closely associated with the distribution of the heat sources and sinks. After the establishment of the East Asia monsoon, the main heat source center is located over the northern the South China Sea, the heat sink is in the equatoral area, a strong ascending motion occues in the South China Sea and a descending motion appears in the south of equator. During the period of an active monsoon, the meridional cell over the South China Sea is stronger than the one over the Indo-China Peninsula. The atmospheric heat sources play an important role in the maintenance of the meridional cell.