摘要
2005年初夏云南大部地区出现了50 a来最为严重的干旱天气,影响范围、程度及所造成的经济损失达历史之最。通过对比分析,造成此异常气候主要是南亚高压季节性北跳偏晚,极地冷空气偏弱,亚洲地区的经向环流造成西太平洋副高偏强、偏西、偏南,中高层大气环流季节转换滞后所致。
In the late spring and early summer of 2005, Yunnan encountered drought event, which was the severest in the recent 50 years. By comparative analysis, it was found that the main influence factors for this abnormal weather event were the delay of seasonal evolution of South Asia high, and relatively weak cold air in polar region, as well as relatively strong of the subtropical high over the western Pacific lying southwestwards resulted from meridional circulation over Asia, and lagging of the seasonal shift of circulation in middle - high levels.
出处
《干旱气象》
2007年第1期32-37,共6页
Journal of Arid Meteorology
基金
中国气象局气象新技术推广项目(CMATG2006M45)
中国气象局成都高原气象开放实验室基金项目(LPM2006015)共同资助
关键词
云南
干旱
南亚高压
副热带高压
西风急流
Yunnan
drought
South Asia high
subtropical high
westerly jet
