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大气科学  2015 

长江中下游地区夏季降水的水汽路径的客观定量化研究

DOI: 10.3878/j.issn.1006-9895.1409.14208

Keywords: 降水量 水汽路径 水汽输送通量

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Abstract:

本文根据中国台站降水资料和NCEP/NCAR再分析资料, 研究了长江中下游地区夏季降水的水汽路径并给出了客观定量化的定义。结果表明:(1)影响长江中下游地区夏季降水的水汽路径主要是来自南界的水汽输送, 据此定义了南界水汽路径的面积、中心强度、向东延伸格点的位置以及边界强度等指标;(2)对各个指标的时间演化特征进行了分析, 南界水汽路径的面积指标和中心强度指标有下降的趋势, 各个指标在20世纪90年代前后都有一个明显的转折, 面积指标、中心强度指标、边界纬向强度指标都有明显的年代际的变化;(3)对各指标与中国夏季降水和前冬海表温度进行相关分析, 夏季南界水汽路径影响我国不同地区的降水, 南界水汽路径的面积指标、中心强度指标与前一年冬季西太平洋的海温呈显著负相关, 与赤道中太平洋和东太平洋前一年冬季的海温呈显著正相关, 即前冬东太平洋发生El Ni?o时, 有利于夏季西太平洋水汽输送增强, 进而有利于长江中下游地区夏季降水偏多

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