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本文诊断分析了１９９８年夏季长江流域洪涝的平均经向大尺度水汽输送的特征，结果表明，１９９８年夏季盂加拉湾地区和南海地区经向水汽输送大小是因月份、高度而异。进一步分析结果表明，在印度季风和南海季风不同的位相阶段，孟加拉湾地区和南海地区的经向水汽输送也是各不相同的，这也和各月经向水汽输送变化基本一致。
This paper diagnoses and analyzes the characteristics of mean meridional and large-scale water vapor transport in the summer of 1998 in the Yangtze River Basin. The results show that the meridional water vapor transport in Bijue Bay and the South China Sea in summer 1998 varies with the month and altitude. Further analysis shows that the meridional water vapor transport in the Bay of Bengal and the South China Sea is also different at different phases of the Indian monsoon and the South China Sea monsoon.