2006年高原夏季风强弱变化及其与西南地区东部夏季气温和降水的关系

摘要

Based on the daily precipitation and temperature data at 37 meteorological stations in eastern southwest China and NCEP/NCAR R2 reanalysis data in 2006,the variation characteristics of the plateau summer monsoon and its relation with summer climate in eastern southwest China were analyzed and discussed by the correlation analysis and composite analysis. The results showed that the variations of plateau summer monsoon had close connection with summer climate in eastern southwest China in 2006. The variations of plateau summer monsoon intensity were closely related with persistent anomalies of atmospheric circulation in the same period,such as the South Asia High( SAH),atmospheric circulation anomalies in the mid-high latitude,Western Pacific Subtropical High( WPSH), westerly belt circulation,lower-level flow field,vertical movement and so on,and then affected climate change in eastern southwest China in summer of 2006. Furthermore,the correlation between the seasonal change of plateau summer monsoon and the atmospheric heat source over Tibetan plateau in summer of 2006 was obviously positive. The thermal effects of atmosphere over Tibetan Plateau played an important role in anomalous variation of the plateau summer monsoon.%利用2006年西南地区东部37个测站逐日降水量、气温资料和NCEP/NCAR R2再分析日平均资料，通过相关分析和合成分析，研究分析了高原夏季风季节内变化特征，讨论了高原夏季风强弱变化特征及其与西南地区东部夏季气候的关系。结果表明：高原夏季风的变化和西南地区东部夏季气候变化关系密切。当高原夏季风偏强（弱）时，南亚高压、中高纬度环流、西太副高、西风带环流、低层流场以及垂直运动等均有显著变化，进而影响到西南地区东部夏季气候。高原夏季风的季节内变化与青藏高原大气热源呈显著正相关关系，青藏高原热力作用对高原夏季风的异常变化有重要作用。