| 天气与气候 |
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| Trend of Potentia1 Evapotranspiration and Pan Evaporation and Their Main Impact Factors in Different Climate Regions of Gansu Province |
| WANG Su-ping1, ZHANG Cun-jie2, HAN Yong-xiang1 |
| 1.Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province ＆ Open Key Laboratory of Arid Climate Change and Reducing Disaster of China Meteorological Administration, Lanzhou Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China; 2.Lanzhou Regional Climate Center, Lanzhou 730020, China |
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Abstract Decreasing trends of pan evaporation and potential evapotranspiration in many regions of the world have been investigated by researchers all over the world, and it is recognized that the decline tendency of global radiation, net radiation, sunshine duration and wind speed are the main reasons for the decreasing of pan evaporation and potential evapotranspiration. However, it is also suggested that the trends, the changing range and the main impact factors are varied in different regions because of the different terrains, different locations and different climate types. Based on the climatic data from 4 meteorological stations in the different climate regions in Gansu province during 1970—2007, the potential evapotranspirations(ET0) and pan evaporation(EΦ20) are analyzed in this paper. And through a partial correlation analysis, the major climate factors which affect ET0 and EΦ20 are also analyzed. Results are as follows:(1) In recent 38 years, the annual EΦ20 have increased in all of the four climatic stations, and it changed from the obvious increase in the drier and warmer region（Dunhuang）to the little increase in the colder and more humid region（Maqu); (2) The annual ET0 in Dunhuang and Wenxian show a obvious decrease tendency during the past 38 years; increased slightly in the colder and more humid region (Maqu); increased obviously in Mazongshan in mid temperate arid zone; (3) Generally, wind speed have great impact on the ET0 and the decline tendency of wind speed appears to be the major cause for the negative trend of the ET0 in all regions. On the other hand, the heat factors like net radiation has a great impact on the EΦ20.
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Received: 07 April 2009
Published: 20 May 2010
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2010, Vol. 30 
