中文摘要：

在亚洲的中间高度的纬度上的夏天降水的一个偶极子模式，它被反对夏天降水变化在之间描绘蒙古并且东北中国(MNC ) 区域和向西西伯利亚的平原(WSP ) ，被发现在 19812011 期间在 interdecadal 和 interannual 规模上清楚、稳定。在在河(HR ) 区域是的 WSP 和 Heilongjiang 以内的一个小区域上的春天雪盖子异例仔细与这个偶极子模式的变化有关在随后的夏天期间，并且他们能因此被看作预报因素。我们的统计结果暗示解释在春天雪异例和夏天降雨偶极子之间的关系的一个潜在的过程。相应于雪异例， Rossby 波浪从 WSP 区域宣传一条路径经由蒙古的高原，在夏天期间变化到 Stanovoy。同时，沿着这条路径的 Rossby 波浪精力分叉和集中维持并且增强在亚洲大陆上配对的异常气旋和反气旋，它显著地被连接到在 MNC 和 WSP 区域之间的相反的夏天降水异例。数字实验被需要进一步证实上面推测并且示威连接春天雪盖子异例和夏天降水偶极子的详细物理机制。

英文摘要：

A dipole pattern of summer precipitation over the mid-high latitudes of Asia, which is characterized by opposing summer precipitation variations between the Mongolian and Northeast China （MNC） region and the West Siberian Plain （WSP）, is found to be clear and stable on both interdecadal and interannual scales during 1981- 2011. Spring snow cover anomalies over a small region within the WSP and the Heilongjiang River （HR） region are closely related to the variation of this dipole mode during the subsequent summer, and they can therefore be considered as forecasting factors. Our statistical results imply a potential process explaining the relationship between the spring snow anomalies and the summer rainfall dipole. Corresponding to the snow anomalies, Rossby waves propagate along a path from the WSP region, via the Mongolian Plateau, to the Stanovoy Range during summer. At the same time, Rossby-wave energy divergences and convergences along this path maintain and reinforce an anomalous cyclone and anticyclone pairing over the Asian continent, which is significantly linked to opposite summer precipitation anomalies between the MNC and WSP regions. Numerical experiments are need- ed to further confirm the above conjecture and demonstrate the detailed physical mechanisms linking the spring snow cover anomalies and summer precipitation dipole.