Characteristics of the Summertime Water Vapor Transports over the Eastern Part of China and Those over the Western Part of China and Their Difference
Characteristics of the Summertime Water Vapor Transports over the Eastern Part of China and Those over the Western Part of China and Their Difference
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发表时间：
2010
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通讯作者：
Huang Ronghui
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作者：
Huang Ronghui
利用1971-2000年ERA逐日资料，分析了我国东部季风区和东北干旱、半干旱区夏季水汽输送的气候学特征及其差异。结果表明，夏季中国东部季风区的水汽输送与夏季中国东部季风区的水汽输送有明显的差异，夏季中国东部季风区的水汽输送与夏季中国东部季风区的水汽输送有明显的差异。由于亚洲夏季风气流将大量的水汽从孟加拉湾、南海和热带西太平洋输送到中国东部季风区，夏季中国东部季风区纬向水汽输送通量大于纬向水汽输送通量，但受西风带的影响，在中纬度地区，西北干旱和半干旱区夏季纬向水汽输送通量大于纬向水汽输送通量，无论是纬向还是纬向水汽输送通量都比东部季风区小一个数量级，结果表明，夏季中国东部季风区水汽输送通量的辐散不仅取决于水汽平流，还取决于该地区风场的辐合或辐散，而在西北干旱半干旱区，则主要取决于水汽平流，另外，中国东部季风区的水量平衡与西北干旱半干旱区的水量平衡存在明显差异。
Characteristics of the climatological mean summertime water vapor transports for 1971-2000 over the monsoon region of eastern China and those over the arid and semi-arid regions of Northeast China and their differences are analyzed by using the daily data of the ERA-40 reanalysis.The results show that there are some obvious differences between the summertime water vapor transports over the monsoon region of East China and those over the arid and semi-arid regions of Northwest China.Since a large amount of water vapor is transported by the Asian summer monsoon flow from the Bay of Bengal,the South China Sea,and the tropical western Pacific into the monsoon region of eastern China,the meridional water vapor transport fluxes are larger than the zonal water vapor transport fluxes in the monsoon region of eastern China in summer.But influenced by the westerly zone over midlatitudes,the summertime zonal water vapor transport fluxes are larger than the meridional water vapor transportfluxes in the arid and semi-arid regions of Northwest China,and either zonal or meridional water vapor transport fluxes in the region are one order of magnitude smaller than those in the monsoon region of East China.Moreover,the results show that the divergence of the summertime water vapor transport fluxes in the monsoon region of East China depends on not only the moisture advection,but also the convergence or divergence of wind field over this region,but it mainly depends on the moisture advection in the arid and semi-arid regions of Northwest China.Besides,the results also show that the water balance in the monsoon region of eastern China is obviously different from that in the arid and semi-arid regions of Northwest China.