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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Intraseasonal variation of monsoon activities associated with the rainfall over Bangladesh during the 1995 summer monsoon season
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Intraseasonal variation of monsoon activities associated with the rainfall over Bangladesh during the 1995 summer monsoon season

机译：与1995年夏季季风季节期间孟加拉国降雨相关的季风活动的季节内变化

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摘要

The rainfall over Bangladesh during the 1995 summer monsoon season has been investigated in terms of the intraseasonal variation of monsoon activities. The rainfall over Bangladesh is basically dominated by the north-south oscillation of the monsoon trough. The rainfall increases when the monsoon trough is located at the foot of the Himalayas, because synoptic-scale convective activity is much more vigorous to the south of the monsoon trough axis than to the north of it. In addition, the strong southwesterly wind to the south of the monsoon trough intensifies local convective activity owing to the effects of the orography to the north and east of the country. It is also found that the monsoon rainfall over Bangladesh in 1995 varies with a periodicity of similar to 20 days, and this rainfall variation is closely associated with synoptic-scale monsoon activities spreading over South and Southeast Asia. The active/break cycle of the rainfall variation during the 1995 summer monsoon season can be mostly explained by the northward propagation of what is called the 10-20 day variation of monsoon activities. [References: 31]
机译：根据季风活动的季节内变化，对1995年夏季季风季节期间孟加拉国的降雨进行了调查。孟加拉国的降雨基本上以季风槽的南北振荡为主。当季风槽位于喜马拉雅山脚下时，降雨增加，这是因为天气尺度的对流活动在季风槽轴南侧比北侧强得多。此外，由于该国北部和东部地形的影响，季风槽南部的西南偏强风增强了当地的对流活动。我们还发现，1995年孟加拉国的季风降雨以大约20天的周期变化，并且这种降雨变化与分布在南亚和东南亚的天气尺度季风活动密切相关。 1995年夏季季风季节降雨变化的活动/中断周期主要可以通过所谓的季风活动10-20天向北传播来解释。 [参考：31]

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