【摘要】 利用 GMS-5卫星水汽通道资料分析了 1995年夏秋季热带副热带对流层中上层水汽场的分布及其变化。分析表明：南印度洋-澳大利亚-南太平洋地区是夏秋季对流层中上层最干的地区，赤道太平洋、北太平洋是相对干区；夏秋季南亚和中国南部是对流层中上层最潮湿的地区，夏季比秋季更潮湿。反映出季风在这一地区的活动特点。月平均水汽场从 8月到 9月，高湿带由华北平原突然南跳到南海海面，表明对流层中上层的水汽场在 9月份发生突变，比大气环流的 10月突变早 1个月完成；青藏高原夏季东南部为湿区，秋季西北部为湿区。更多还原

【Abstract】 With GMS-5 water vapour data during summer and autumn in 1995, moisture distribution and change in the upper-middle troposphere of tropical and subtropical belts are analyzed. It is shown that South India Ocean-Australia-South Pacific is the aridest region in upper-middle troposphere in summer and autumn, Equator Pacific and North Pacific is less arid region and South Asia and Southern China is the most humid region, which is wetter in summer than in autumn. This reflects the characteristic of monsoon activity in this region. From August to September, highly humid zone in monthly mean vapour field unexpectedly jumps southward from Huabei Plain to South China Sea, which shows a sudden change in vapour field in upper-middle troposphere in September, one month earlier than that in general circulation in October. Southeast Tibetan Plateau is humid region in summer and Northwest is humid in autumn.更多还原