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In this study,two types of El Nio events are distinguished and the correlations between the respective precipitation,temperature,and runoff are analyzed by a 5-point moving average method.Also,changes of the temperature,precipitation,and runoff from mountainous watersheds of the Hexi Corridor region caused by these two types of El Nio events from 1959 to 2005 are studied by the anomaly analysis method.The results indicate that the Hexi Corridor region is strongly influenced by El Nio:rising temperatures and decreasing precipitation and runoff are features of the first El Nio pattern,while decreasing temperature and increasing precipitation and runoff characterise the second pattern.The responses of temperature to El Nio events are stronger in plains than in mountain regions,but the responses of precipitation are obvious in both types of regions.The response of runoff to El Nio events is lower than the precipitation and temperature response because runoff from mountainous watersheds has a complex generation and concentration process.
In this study, two types of El Nio events are distinguished and the correlations between the respective precipitation, temperature, and runoff are analyzed by a 5-point moving average method. Also, changes of the temperature, precipitation, and runoff from mountainous watersheds of the Hexi Corridor region caused by these two types of El Nio events from 1959 to 2005 are studied by the anomaly analysis method. The results that results that the Hexi Corridor region are strongly influenced by El Nio: rising temperatures and decreasing precipitation and runoff are features of the first El Nio pattern, while decreasing temperature and increasing precipitation and runoff characterise the second pattern. responses of temperature to El Nio events are stronger in plains than in mountain regions, but the responses of precipitation are obvious in both types of regions. the response of runoff to El Nio events is lower than the precipitation and temperature response because runoff from mountain ous watersheds has a complex generation and concentration process.