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应用青藏高原 49个站点的积雪观测资料和西北地区 85个台站 3～ 5月降水资料 ,分析了两者之间的相关关系 .结果表明 ,高原积雪与西北春季降水存在弱的相关关系 ,高原积雪存在 2个主要的变化敏感区 ,2个敏感区积雪的变化与西北春季降水的 6个敏感区有着不同的关系 ,高原南部积雪多 ,西北春季降水少 .高原积雪对西北春季降水的影响是一个相对较慢的过程 .交叉谱分析表明 ,高原积雪与西北春季降水有较高的凝聚 ,最大落后尺度 0 .0 2～ 3a .t检验表明 ,多雪年与少雪年 ,高原东北侧、河西西部的春季降水差异最为显著 .
The snow cover data of 49 stations in the Qinghai-Tibet Plateau and the precipitation data of 85 stations in Northwest China from March to May are analyzed, and the correlation between them is analyzed.The results show that there is a weak correlation between snow cover in the plateau and spring precipitation in Northwest China There are two main sensitive areas for snow cover in the plateau. The changes of snow cover in the two sensitive areas have different relations with the six sensitive areas in spring precipitation in the northwest, with more snow in the southern plateau and less precipitation in the northwest during the spring. The effect of the spring precipitation in the northwest is a relatively slow process. Cross-spectrum analysis shows that the snow cover in the plateau is highly aggregated with the spring precipitation in the northwest China, and the maximum lagging scale is 0. 02 ~ 3a. The test shows that the snowy years are less The snowfall, the northeast plateau, the western Hexi area spring precipitation is the most significant difference.