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基于NCEP资料的近30年夏季青藏高原低涡的气候特征

李国平 赵福虎 黄楚惠 牛金龙

李国平, 赵福虎, 黄楚惠, 牛金龙. 基于NCEP资料的近30年夏季青藏高原低涡的气候特征[J]. 大气科学, 2014, 38(4): 756-769. doi: 10.3878/j.issn.1006-9895.2013.13235
引用本文: 李国平, 赵福虎, 黄楚惠, 牛金龙. 基于NCEP资料的近30年夏季青藏高原低涡的气候特征[J]. 大气科学, 2014, 38(4): 756-769. doi: 10.3878/j.issn.1006-9895.2013.13235
LI Guoping, ZHAO Fuhu, HUANG Chuhui, NIU Jinlong. Analysis of 30-Year Climatology of the Tibetan Plateau Vortex in Summer with NCEP Reanalysis Data[J]. Chinese Journal of Atmospheric Sciences, 2014, 38(4): 756-769. doi: 10.3878/j.issn.1006-9895.2013.13235
Citation: LI Guoping, ZHAO Fuhu, HUANG Chuhui, NIU Jinlong. Analysis of 30-Year Climatology of the Tibetan Plateau Vortex in Summer with NCEP Reanalysis Data[J]. Chinese Journal of Atmospheric Sciences, 2014, 38(4): 756-769. doi: 10.3878/j.issn.1006-9895.2013.13235

基于NCEP资料的近30年夏季青藏高原低涡的气候特征

doi: 10.3878/j.issn.1006-9895.2013.13235
基金项目: 国家自然科学基金项目41175045、91337215,国家重点基础研究发展计划(973计划)项目2012CB417202,公益性行业(气象)科研专项GYHY201206042

Analysis of 30-Year Climatology of the Tibetan Plateau Vortex in Summer with NCEP Reanalysis Data

  • 摘要: 基于NCEP/NCAR再分析资料并通过人工识别与天气图对比,本文对1981~2010年夏季高原低涡的气候特征进行了统计分析,对比研究了高原低涡高发年和低发年的大气环流场和低频分量场的特征,主要结果有:(1)近30年来夏季高原低涡平均每年生成32个,低涡发生频数呈现较明显的增多趋势,并具有较强的年际变化特征,低涡频数在2000年和2005年出现显著突变,在2000年由增多趋势转为减少趋势,在2005年又转为增多趋势,同时低涡频数具有显著的准5年、准9年和准15年周期振荡,6月生成的高原低涡呈减少趋势,而7月和8月生成的高原低涡均呈现增多趋势;(2)夏季高原低涡生成源地主要集中在西藏双湖、那曲和青海扎仁克吾一带,其中高原中部涡占50.8%,西部涡占27.0%,东部涡占22.2%,6月、7月和8月生成的高原低涡分别占夏季低涡总数的44.7%、29.9%和25.4%,高原低涡生成时绝大多数为暖性涡,占总数的90.7%。近30年来平均每年夏季有1.3个高影响高原低涡移出高原并在下游大范围地区产生强降水天气;移出的高原低涡以东移为主,占移出高原低涡的56.4%,而东北移和东南移的分别占移出高原低涡的20.1%和20.5%;(3)高原低涡高发年,低层的大气环流场和低频大气环流分量场均表现出较强的水平辐合及偏南气流,高层的青藏高压在高原主体范围内较气候态偏强;高原低涡低发年的情况则与之相反,伊朗高原上空的气旋、青藏高原低槽和高原南侧反气旋的配置对高原低涡的发生具有重要作用。
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  • 收稿日期:  2013-08-02
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