青藏高原地面感热异常对西北地区东部夏季降水的影响

本文利用1961~2012年夏季西北地区东部(32~40°N,100~110°E)156个站点逐日降水资料,以及1982~2012年青藏高原70个站点的地面感热观测资料,采用EOF、相关分析等方法分析了西北地区东部夏季降水、青藏高原冬末春初(2~4月)地面感热的时空变化特征,讨论了西北地区东部夏季降水对于青藏高原冬末春初地面感热异常的响应,通过环流场分析高原感热异常对西北东部夏季降水的影响成因。结果表明:高原东部冬末春初地面感热偏强时,西北东部地区北部降水偏少,东南部和西南部降水偏多;反之,西北东部北部降水偏多,东南部和西南部降水偏少。 

Effects of Surface Sensible Heat Anomaly over the Tibetan Plateau on Summer Precipitation in the East Part of Northwest China

In this paper,we use the data of 156 stations' summer daily precipitation from 1961 to 2012 in eastern Northwest China(32 ~ 40°N,100 ~ 110°E),and the Qinghai Tibet Plateau's 70 site of the ground heat observation data form 1982 to 2012. Using the method of EOF、correlation analysis to discuss the temporal and spatial variation of northwest eastern China summer rainfall and the Qinghai Tibet Plateaus surface sensible heat in late winter and early spring(2 ~ 4 months). Discussing the response of summer precipitation eastern Northwest China to the Qinghai Tibet Plateau in late winter and early spring surface sensible heat anomaly. Through the analysis of the circulation field discusses the Tibetan Plateau sensible heat of summer precipitation in Northwest Eastern influence factors.