南亚夏季风爆发前后高度场温湿场的演变特征

利用诊断分析方法，研究南亚夏季风爆发前后高度场、温湿场的演变特征。结果发现夏季风的爆发与南亚高压、马斯克林高压、南美洲大陆上的高压以及巴哈马群岛附近海域上的高压密切相关。季风爆发前后，印度次大陆上高度场在垂直方向发生了反相变化，低层减弱，高层加强，这使得垂直对流发展加强。南亚夏季风爆发前后在印度次大陆及其西岸各层上湿度均急剧增大。表明随着南亚夏季风的爆发，全球温度场、高度场、湿度场都发生了重大调整，南亚夏季风的爆发是全球环流形势调整的一环。

Evolution character of height temperature and humidity field during onset phase of Indian summer monsoon

The evolution character o f height field, temperature and humidity filed during onset phase of the Indian summer monsoon was diagnosed. It is found that the onset of Indian summer monsoon has close relation to the Tibetan high, the high over the South Am erica and the high over Bahamas. During the onset, the height field over the India su bcontinent changes contrarily. The subdued height field in the low level and the for tified height field in the high level makes the updraft current stronger. The hu midity filed augments rapidly over the India subcontinent and the nearly west se a area in all levels. It is shown that there is very evident adjustment of globa l height field,temperature and humidity filed with the monsoon onset, and onset of Indian summer monsoon is a member of the global adjustment.