亚洲热带地区对流爆发和推进的气候特征

CLIMATOLOGICAL FEATURES OF CONVECTION ONSET AND ADVANCING OVER ASIAN TROPICAL REGION

利用日本 Ｇ Ｍ Ｓ Ｔ Ｂ Ｂ资料和 Ｇ Ｐ Ｃ Ｐ降水资料，用滑动 ｔ检验法研究了亚洲热带地区春夏季节转换期对流爆发和推进的气候特征。结果表明：亚洲热带地区对流爆发首先于４ 月中旬发生在中南半岛中部，然后向东缓慢推进。南海地区对流爆发于 ２８候，具有全面爆发的特征。亚洲热带地区春夏季节转换期对流的发生具有显著的爆发性，滑动ｔ检验表明：亚洲热带地区对流爆发时 Ｔ Ｂ Ｂ和降水值的突变都超过了０．０１的信度水平；各个子系统都有各自独立的爆发中心；信度最高，即爆发性最强的地区是南海北部、孟加拉湾东北部和印度东北部。

Based on the T BB data from Japanese GMS satellite and the GPCP rainfall, movable t test technique is employed to reveal the climatological features of convection onset and advancing over the Asian tropical region during the spring to summer season.Results show that the convection occurs first in the middle Indo China peninsula in mid April,and then slowly advances eastward,expanding to the whole South China Sea in 28th pentad.The convection experiences such a strongly sbrupt change over Asian tropical area during the spring to summer season that the movable t test of the T BB and rainfall exceeds the statistical significance at 0.01 level.It is also found that each subregion has its own center of convection onset,with the northern South China Sea,northeastern Bay of Bengal and northeastern India being the most significant regions.