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大气科学  2015 

近52年长江中下游地区夏季年代际尺度干湿变化及其环流演变分析

DOI: 10.3878/j.issn.1006-9895.1412.14186

Keywords: 长江中下游 标准化降水指数 干湿特征 环流演变

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Abstract:

利用中国气象局国家气象信息中心提供的长江中下游地区353站1961~2012年逐月降水资料,通过计算得到各站点夏季标准化降水指数(SPI)。根据长江中下游地区夏季中旱及以上等级站点数目及其突变检测(Mann-Kendall方法,MK)结果,将时间序列划分为三个时段。在此基础上,利用NCEP/NCAR再分析资料及NOAA海洋表面温度重建资料,分析了各个时段前冬至夏季环流背景场的异常特征及其演变过程,并建立了各时段的概念模型。结果表明:(1)长江中下游夏季在第一时段(1961~1973年)呈明显干旱状态;第二时段(1974~1986年)为干旱向湿润转变的阶段;第三时段(1987~2012年)基本转为湿润状态。(2)第二时段为第一时段与第三时段的过渡期,环流背景场在该时段发生明显变化,使得第一时段与第三时段所对应季节的环流距平场相位相反。(3)第一时段,前冬至夏季全球海温持续偏冷,印度洋海温冷异常在夏季尤为显著,南亚高压与西太平洋副热带高压偏弱;前冬,青藏高原北部脊偏弱,蒙古高压明显偏弱;夏季,印度低压偏强、南支槽加深,夏季风水汽输送偏强,而亚洲中高纬度为平直西风气流,北方冷空气不易南下至我国南方地区,冷暖空气交绥受阻,使得长江中下游夏季出现大范围的干旱。第三时段相对于第一时段,前冬至夏季全球海温暖异常,印度洋海温显著偏暖,西太平洋副热带高压偏强;前冬,青藏高原北部脊偏强,蒙古高压异常偏强;夏季,印度低压减弱、南支槽异常偏弱,夏季风水汽输送较弱,水汽滞留在长江流域,且贝加尔湖高压脊发展,脊前冷空气南下,使得长江中下游夏季降水偏多

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