Based on the available original dust storm records from 60 meteorological stations, we discussed the identification standard of severe dust storms at a single station and constructed a quite complete time series of se...Based on the available original dust storm records from 60 meteorological stations, we discussed the identification standard of severe dust storms at a single station and constructed a quite complete time series of severe group dust storms in the eastern part of Northwest China in 1954–2001. The result shows that there were 99 severe group dust storms in this region in recent 48 years. The spatial distribution indicates that the Alax Plateau, most parts of the Ordos Plateau and most parts of the Hexi Corridor are the main areas influenced by severe group dust storms. In addition, the season and the month with the most frequent severe group dust storms are spring and April, accounting for 78.8% and 41.4% of the total events respectively. During the past 48 years the lowest rate of severe group dust storms occurred in the 1990s. Compared with the other 4 decades, on the average, the duration and the affected area of severe group dust storms are relatively short and small during the 1990s. In 2000 and 2001, there were separately 4 severe group dust storms as the higher value after 1983 in the eastern part of Northwest China.展开更多
采用ERA Interim再分析资料和160站逐月站点降水资料,运用经验正交函数(EOF)分析、合成分析等方法揭示了西北东部3个分区的水汽输送的区域气候特征、与降水EOF气候模态相对应的整层水汽输送特征以及降水偏多(少)年的水汽输送异常特征。...采用ERA Interim再分析资料和160站逐月站点降水资料,运用经验正交函数(EOF)分析、合成分析等方法揭示了西北东部3个分区的水汽输送的区域气候特征、与降水EOF气候模态相对应的整层水汽输送特征以及降水偏多(少)年的水汽输送异常特征。结果表明:西北地区东部夏季经向水汽输送的大值区处于900 h Pa^800 h Pa高度上;纬向水汽输送大值位于700 h Pa^500 h Pa高度上。对西北东部降水做EOF分析,第一模态为全区一致型,与降水相对应的西风影响区主要盛行西风水汽输送,季风边缘区的南部盛行西南风水汽输送;第二模态为东南-西北型,东风、东北风水汽输送流入西北东部地区;第三模态为东北-西南型,西风和西北风水汽输送将水汽带到西风影响区内。展开更多
基金The National Key Basic Research Project of China, No. G2000048703 The Knowledge Innovation Project of CAS, No. KZCX2-305 Key Research Project of NSMC, No.NSMC-Y0101
文摘Based on the available original dust storm records from 60 meteorological stations, we discussed the identification standard of severe dust storms at a single station and constructed a quite complete time series of severe group dust storms in the eastern part of Northwest China in 1954–2001. The result shows that there were 99 severe group dust storms in this region in recent 48 years. The spatial distribution indicates that the Alax Plateau, most parts of the Ordos Plateau and most parts of the Hexi Corridor are the main areas influenced by severe group dust storms. In addition, the season and the month with the most frequent severe group dust storms are spring and April, accounting for 78.8% and 41.4% of the total events respectively. During the past 48 years the lowest rate of severe group dust storms occurred in the 1990s. Compared with the other 4 decades, on the average, the duration and the affected area of severe group dust storms are relatively short and small during the 1990s. In 2000 and 2001, there were separately 4 severe group dust storms as the higher value after 1983 in the eastern part of Northwest China.
文摘采用ERA Interim再分析资料和160站逐月站点降水资料,运用经验正交函数(EOF)分析、合成分析等方法揭示了西北东部3个分区的水汽输送的区域气候特征、与降水EOF气候模态相对应的整层水汽输送特征以及降水偏多(少)年的水汽输送异常特征。结果表明:西北地区东部夏季经向水汽输送的大值区处于900 h Pa^800 h Pa高度上;纬向水汽输送大值位于700 h Pa^500 h Pa高度上。对西北东部降水做EOF分析,第一模态为全区一致型,与降水相对应的西风影响区主要盛行西风水汽输送,季风边缘区的南部盛行西南风水汽输送;第二模态为东南-西北型,东风、东北风水汽输送流入西北东部地区;第三模态为东北-西南型,西风和西北风水汽输送将水汽带到西风影响区内。
