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印度洋偶极子对北印度洋热带气旋活动的影响研究

, PP. 570-581

Keywords: 北印度洋,热带气旋,年际变化,印度洋偶极子

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Abstract:

?利用JTWC提供的1981~2010年北印度洋热带气旋路径资料,NECP提供的风场、OLR场等资料,以及NOAA提供的SST资料,使用统计诊断方法研究了北印度洋热带气旋活动时空分布特征及其与印度洋海温的关系.结果表明:北印度洋热带气旋活动频次EOF1占总方差贡献的比例为16%,反映了北印度洋整个海盆尺度热带气旋活动频次变化基本一致的分布形态,但是其空间分布具有不均匀性,表现为以孟加拉湾热带气旋偏西路径变化为主的特征;小波分析表明EOF1模态有显著的准5年变化周期.印度洋偶极子对北印度洋热带气旋活动年际变化影响显著,其影响机制概念模型为:印度洋偶极子处于正(负)位相模态时,印度洋海温异常呈显著的西暖东冷(西冷东暖)型分布,造成北印度洋上空对流减弱(加强)、低层有反气旋(气旋)式环流异常,不利(有利)于热带气旋在北印度洋生成,北印度洋热带气旋活动频次偏少(多);且可造成孟加拉湾上空西风引导气流加强(减弱),进一步使得出现在孟加拉湾90°E以西的偏西路径热带气旋偏少(多).

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