摘要
分析了在全球气候变暖背景下 ,西北地区秋季降水的时空变化特征和主要影响因素 ,发现秋季降水量的均值突变现象在四季中最为明显 ,西北地区东部和西部降水在年代际尺度上具有相反的变化趋势 .ElNino年秋季 ,新疆脊偏强 ,印缅槽偏弱 ,西北地区东部降水偏少 ;LaNina年秋季降水形势相反 .CO2 倍增情况下的数值试验表明 ,西北地区西部夏季降水增加明显 ,而秋季不明显 ;西北地区东部夏季降水呈减少趋势 ,而秋季降水增加明显 .
On the background of global warming, the spatial and temporal variation characteristics of autumn precipitation were analyzed in Northwest China; major influencing factors were also studied. It was found that the catastrophe of autumn precipitation is more obvious than that in other seasons. The interannual variation of precipitation presents a contrary trend between the East and the West. In the autumn of El Nino years, Xinjiang ridge is intensified, India-Burma trough is weakened, and the east of Northwest China is dry. The case of La Nina years is opposite. Numerical simulation experiment has been carried out with doubling CO 2 using the regional climatic model. The results show that in west of Northwest China, precipitation will increase in summer, but it is not obvious in autumn; in east of Northwest China, the case is opposite, autumn precipitation will increase obviously.
出处
《冰川冻土》
CSCD
北大核心
2003年第2期157-164,共8页
Journal of Glaciology and Geocryology
基金
中国科学院知识创新工程重大项目 (KZCX1 10 0 6)
国家科技基础性工作专项资金项目 (2 0 0 1DEA3 0 0 2 9 0 6)
国家自然科学基金项目 (4 0 2 0 5 0 15 )资助
