| Climate characteristics of summer precipitation days in eastern part of northwest |
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| DOI：10.7606/j.issn.1000-7601.2005.03.28 |
| Key Words: eastern part of northwest China summer precipitation days spatial and temporal characteristics EOF decomposition |
| Author Name | Affiliation | | BAI Hu-zhi | Lanzhou Central Meteorological Observatory,Lanzhou 730020,China；Key Laboratory of | | LI Dong-liang | Key Laboratory of Arid Climatic Change and Disaster Reducing of Gansu Province,Lanzhou 730020,China；Cold and Arid Regions Environmental And Engineering Research Institute,CAS,Lanzhou 730000,China | | LU Deng-rong | Lanzhou Central Meteorological Observatory,Lanzhou 730020,China | | FANG Feng | Lanzhou Central Meteorological Observatory,Lanzhou 730020,China |
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| Abstract: |
| Using the observed data at 104 stations in the eastern part of northwest China during 1960-2000, spatial and temporal abnormity characteristics of summer precipitation days were analyzed by the means of EOF and REOF. The results showed that the summer precipitation days is more in the west regions than the east regions, and a precipitation center lies along Qilian mountain, where the days and amount of precipitation are higher. There are two types of spatial abnormity distribution: consistent abnormity and north-south reverse abnormity. The climate region can be divided into 5 sections, i.e., the middle-east part and Hetao of Gansu, Weihe river basin, Hexi Corridor, northern Qinghai, southern Qinghai and northern Sichuan. In 1980's the precipitation days decreased gradually. The summer precipitation days is influenced by the intensity of surface heat-field in Qing-Zang Plateau in winter and summer. |
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