The Impact of Trans-equatorial Monsoon Flow on the Formation of Repeated Torrential Rains over Java Island
The Impact of Trans-equatorial Monsoon Flow on the Formation of Repeated Torrential Rains over Java Island
复制标题
跨赤道季风气流对爪哇岛反复暴雨形成的影响
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Y. Djajadihardja
中科院分区：
文献类型：
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作者：
P. Wu;M. Hara;H. Fudeyasu;M. Yamanaka;J. Matsumoto;F. Syamsudin;R. Sulistyowati;Y. Djajadihardja
2007 年 1 月下旬和 2 月初，爪哇岛反复出现暴雨，造成大面积洪水，同时北半球出现强烈且持续的跨赤道季风气流。虽然岛上山区的对流在下午频繁出现，但北部平原的对流在夜间和早晨却很活跃。强烈的跨赤道季风气流和上层东南风，在岛上产生强烈的低空垂直风切变和干燥的中层环境。这些条件使得强对流能够反复发生数天并持续较长时间。结果表明，跨赤道季风气流在反复暴雨的形成中起主要作用。据估计，在爪哇岛上发生强烈且持续的跨赤道季风气流并导致暴雨和大范围洪水的概率为每 5-10 年一次。
Torrential rains that repeatedly occurred over Java Island causing widespread floods in late January and early February 2007 coincided with a strong and persistent trans-equatorial monsoon flow from the Northern Hemisphere. While convections develop frequently over the island’s mountainous areas in the afternoon, convections over the northern plains are active during the night and morning hours. The strong trans-equatorial monsoon flow with an upper southeasterly wind produces a strong low-level vertical shear of wind and dry mid-level environment over the island. These conditions allow the severe convections to occur repeatedly for days and to sustain for an extended period of time. The results suggest that the trans-equatorial monsoon flow plays a principal role in the formation of the repeated torrential rains. The probability of occurrence of a strong and persistent trans-equatorial monsoon flow that causes torrential rains and widespread floods over Java Island is estimated to be once every 5�10 years.