| 天气与气候 |
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| Trend of Potential Evapotranspiration and Its Main Impact Factors in the Source Regions of Yangtze and Yellow Rivers |
| WANG Su-ping |
| Lanzhou Institute of Arid Meteorology, China Meteorological Administration, 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 730020, China |
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Abstract Based on the climatic data from 8 stations throughout the source regions of the Yangtze and Yellow rivers during 1966 and 2005, the potentia1 evapotranspirations (ET0) are calculated by the use of the Penman-Monteith Method recommended by FAO. Besides, the spatia1 and tempora1 distributions of the ET0 over the regions as well as their impact factors have been analyzed. Major results are as follows: ①The average annual ET0 in the source regions is 977 mm. The high value is in the northwest part of the area, and the low is in the southeast part. Classified by ET0 value the source regions can be divided into three climate parts, they are the northern part and the southern part of the Yangtze river source region, and the southern part of the Yellow river source region. ②The annua1 and seasonal ET0 variations show declining tendency during the past 40 years, 21-year and 7-year are the main fluctuation periods of the annual ET0. An abrupt change of the annual ET0 happened in 1985. ③Generally, wind speed, net solar radiation and saturation deficit have great impact on the ET0, above all the decline tendency of wind speed appears to be the major cause for the negative trend of the ET0 in the areas.
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Received: 18 April 2008
Published: 07 September 2009
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2009, Vol. 29 
