| Weather and Climate |
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| Change Trend of Pan Evaporation and Its Causes in Shiyang River Basin during 1961—2005 |
| LI Ling-ping1,2, LI Yan-ying2, LIU Ming-chun2 |
1.Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/CMA Key Open Laboratory of Arid Change and Disaster Reduction, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China；
2.Wuwei Meteorological Bureau, Wuwei 733000, Gansu, China |
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Abstract Based on observation data of monthly pan evaporation, mean air temperature, mean relative humidity, precipitation, average wind speed, sunshine hours, maximum temperature and minimum temperature from meteorological stations in the Shiyang River basin during the period of 1961-2005, the change trend of pan evaporation and its causes in these 45 years are analyzed. Results showed that there were increasing trend of annual pan evaporation through the river basin, in the upper reaches and the lower reaches of the Shiyang River basin, and there was a decreasing trend in the middle reaches. The pan evaporation increased in spring, autumn, winter and decreased in summer in 1961-2005. The most significant increase of pan evaporation occurred in winter. There were variation periods of 6-7 years and 1-2 years and abrupt change for annual pan evaporation in Shiyang River basin. We calculated the correlation coefficients between 6 climate factors and pan evaporation. Relative humidity and precipitation were main influencing factors of annual pan evaporation variation in the entire river basin, and middle reaches and lower reaches of the basin; relative humidity and air temperature were main influencing factors in the upper reaches. Main influencing factors of spring pan evaporation change were relative humidity and precipitation; main influencing factors of summer pan evaporation change were relative humidity and air temperature in the entire basin, the up reaches and the middle reaches, and those were relative humidity and precipitation in lower reaches; main influencing factors of autumn pan evaporation change were relative humidity in the entire basin and the up reaches, and was diurnal temperature range in the middle reaches, and were relative humidity and precipitation in upper reaches; main influencing factors of winter pan evaporation change were relative humidity. In a word, relative humidity was the most significant influencing factor of pan evaporation in spring, summer and autumn, and the most significant influencing factor was air temperature in winter.
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Received: 13 August 2011
Published: 20 May 2012
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2012, Vol. 32 
