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SPATIAL AND TEMPORAL CHARACTERISTICS OF THE LONG-TERM TREND FOR TEMPERATURE AND PAN EVAPORATION IN THE WEI RIVER BASIN

He Wanlin Xu Zongxue (College of Water Sciences;Key Laboratory of Water and Sediment Sciences of Ministry of Education of China: Beijing Normal University,100875,Beijing,China)  
The Mann-Kendall statistic test method is used to analyze the spatial and temporal distribution and variations for long-term trend of temperature and pan evaporation at 19 hydrologic stations in the Wei River basin from 1958 to 1999.The results show that the temperature in the studied area over the past 40 years increases in the temporal dimension and the spatial distribution of long-term trend increases gradually from northwestern part to southeastern part.The trend of temperature steadily increases especially in northwestern part of the area.In contrast,evaporation decreases in the temporal dimension.The spatial distribution of long-term trend shows a decrease tendency from north to south.The trend of evaporation decreases gradually from northwestern part to southeastern part.In addition,the relationship between temperature and evaporation is analyzed briefly.Evaporation in the area where the tendency of temperature is great shows a small tendency,and in the area where the temperature shows a small tendency,the tendency of evaporation is great.The physical background will be further investigated in the on-going study.
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