| Analysis on characteristics and change patterns of preci pitation in northwest China |
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| DOI：10.7606/j.issn.1000-7601.2006.04.41 |
| Key Words: northwest China precipitation characteristics change patterns of precipitation analysis |
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| Abstract: |
| According to the climatic conditions of precipitation in northwest China,by making use of the precipitation data of 25 meteorological stations during 1970～2000 in the north subtropical and temperate zone of northwest China,this paper analyzed the characteristics and change patterns of the precipitation from the aspects of the amount,intensity,time and frequency of precipitation.The results show that,during 1970～2000,there was a tendency of decrease of precipitation from both southeast and northwest sides to the central region in the north subtropical and temperate zone in northwestern China.In the east part of middle temperate zone,the precipitation tended to decrease,but in the west part,it tended to increase.The precipitation intensity generally tended to ascend,the ascending range being larger in the southeast region than in the northwest region,and the ascending rate was the largest in southern Xinjiang where was located in the north subtropical humid zone and the south temperate arid zone.The precipitation time showed a trend of reducing,and its distribution characteristic was basically identical to the amount of precipitation,i.e.,being decreased from both southeast and northwest sides to the central region.During 1970～2000,the precipitation amount was increased in the west part but decreased in the east part,and the precipitation time and frequency showed a decreasing tendency,whereas the precipitation intensity and the proportion of strong rain showed an ascending tendency,indicating that the probability of short-term and strong rainfall was increasing and the difficulty in effective use of rainfall was intensified,especially in the east part.Both the amount and time of precipitation in the east part of Qingzang Plateau tended to decrease,showing that the tendency of drying was intensified in this region.However,this characteristic was less obvious in the northeast and north part of the plateau. |
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