【摘要】 利用1961—2017年黑龙江省夏季降水资料和NCEP再分析资料,采用奇异值分解、相关分析、回归分析等方法,研究了青藏高原大气热源与黑龙江省盛夏降水的关系及可能的影响机制。结果表明:5月青藏高原热源与黑龙江省7月降水关系最密切,当5月高原东部热源偏强时,7月黑龙江省中部降水显著偏少。5月热源偏强年,在副热带西风急流的作用下,7月中纬度环流呈现类似"丝绸之路"型遥相关波列,同时东亚沿岸环流呈现类似"东亚—太平洋"型遥相关波列,在二者共同作用下黑龙江省受反气旋式环流影响,7月降水偏少。更多还原

【Abstract】 Based on the summer precipitation data of Heilongjiang province and the National Center for Environment Prediction( NCEP) reanalysis data from 1961 to 2017,we studied the relationship between atmospheric heat source over the Tibetan Plateau and midsummer precipitation in Heilongjiang province as well as the possible mechanism using methods of singular value decomposition,correlation analysis,and regression analysis. The results show that the atmospheric heat source over the Tibetan Plateau in May is closely related to the precipitation in Heilongjiang province in July. When the heat source over the eastern Plateau is strong in May, the precipitation in central Heilongjiang province is significantly low in July. In the presence of strong heat source in May and under the influence of the subtropical westerly jet,atmospheric circulation exhibits similar Silk Road teleconnection waves in middle latitudes and similar East Asia-Pacific teleconnection waves in East Asian coastal regions in July,which makes Heilongjiang province under the control of an anti-cyclonic circulation and thus results in low precipitation in this region.更多还原