利用NCEP/NCAR再分析资料, 通过合成分析、诊断分析等方法研究了淮河流域夏季降水异常年份的大尺度环流场, 并且分析了造成这种环流背景的可能原因.结果表明: 西风急流在多雨年和少雨年作为波导的作用没有变化, 但多雨年西风急流的位置比少雨年偏东。在中高纬地区, 多雨和少雨年200 hPa沿西风急流的定常Rossby波列结构有明显的不同。在多雨年, 有一条明显的沿西风急流传播的Rossby波列结构, 波源位于西欧和中亚, 波汇位于里海和我国淮河流域地区, 日本以东的西北太平洋也是明显的波源区; 在少雨年, 西欧和中亚的波源地区的波活动明显减弱, 原来位于淮河流域的波汇区南压到长江以南, 西北太平洋上的波活动也明显减弱。这种波列结构的不同可能是造成淮河流域夏季降水异常的一个重要原因。
By using NCEP/NCAR reanalysis data, the synthesize methods and the diagnoses methods; the general circulation background of the abnormal precipitation year in Huai River basin and the cause of this general circulation were analyzed. The main result was: there was no significant difference about the westerly jet stream as a wave guide between rainy yeas and dry years, but the location of the jet stream in rainy years are east than in dry years. There was a significant different static Rossby wave structure along the jet stream between rainy years and dry years. In rainy years, there was a obviously Rossby wave along the west jet stream, and the wave source located at West Europe and Central Asia, and the wave sink located at Caspian Sea, Huai River basin and north Pacific. In dry years, the wave source located at West Europe and Central Asia were weakly, and the wave sink in Huai River basin before has moved to the south of Yangtze River, the wave sink located at the North Pacific was also weakly. The difference of the wave structure between rainy years and dry years maybe was an important reason of the abnormal precipitation in Huai River in summer.
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