摘要
大理州2005年初夏出现了严重干旱气象事件。从500pHa高空环流特征、500pHa距平场特征、西太平洋副高特征量及北太平洋中低纬海温距平场、OLR距平场对这次干旱的成因进行了分析,分析结果表明:2005年初夏(4月1日～6月10日)降水异常偏少气温明显偏高是发生干旱的主要原因,高空大气环流异常、西太平洋副高持续偏强偏西、冷空气活动偏北是导致干旱的直接原因;孟加拉湾南部4月O LR场呈明显正距平,抑制低值系统的发展和东北移影响云南,是影响2005年大理初夏干旱重要原因;北太平洋中低纬海温特征与大理州初夏干旱有一定的遥相关性。
Some causes of drought occurred in early summer 2005 in Dali are analyzed by 500h Pa high circulation, 500 hPa anomaly fields , Western Pacific subtropical high, North Pacific Mid-low latitude SST anomaly and OLR anomaly. It is revealed that prediction is fewer than usual and temperature is higher than usual at early summer in 2005 （from 1^st April to 10th June） , which is the primary reason causing drought. Upper-air atmospheric circulation abnormity, Western Pacific subtropical high is stronger and more west and cold air is more north, which is the direct reason causing drought. Obviously positive anomaly OLR in the south of the Bay of Bengal restrain the low system developing and north-east moving to impact Yunnan Province, which is the important reason causing drought. There is some telecorrelation between North Pacific Mid-low latitude SST characteristic and drought occurred in early summer 2005 in Dali.
出处
《云南地理环境研究》
2006年第3期34-39,57,共7页
Yunnan Geographic Environment Research
关键词
大理
初夏干旱
高空环流
副热带高压
热带对流
Dali
drought in early summer
upper-air atmospheric circulation
subtropical
tropical convection
