The InfluencesEffects of Climatic Variables on Pan Evaporation in Ejina Delta in the latest Recent 50 years
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Abstract:
The relationship between the pan evaporation and climatic factors is the important basis to characterize of the effects of climate change on hydrological cycle. Based on the measured meteorological data from in the Ejina mMeteorological sStation from 1961 to 2001, thea Penpan model was developedcalibrated and to reflect the relationship between the pan evaporation and four related climatic variables was obtainedin the Ejina Delta and to estimate the pan evaporation from 2002 to 2011. Therefore, the variations of Changes of pan evaporation and four related climatic variables were analyzed and their effects on the pan evaporation were analyzed during the period from 1961 to 2011 in the Ejina Delta. The pan evaporation change was attributed by analyzing its sensitivity to the related climatic variables. The results showed that: (1) pan evaporation presented a significant negative decreasing trend and itswith a rate of rate was -215.5 mm·10a-1, while. Mmean temperature presented an increasing positive trend. In addition, however wind speed, total radiation, and relative humidity presented negative decreasing trends;. (2) Generally, pan evaporation was most sensitive to wind speed, followed by relative humidity, total radiation, and mean temperature. The sensitivities of pan evaporation to wind speed and relative humidity presented negative trendsdecreased while, however the sensitivities to total radiation and mean temperature presented positive trendsincreased during the period from 1961 to 2011;. and (3) the variation of wWind speed had thecontributed most contribution to the change variation of pan evaporation, followed by relative humidity, mean temperature, and total radiation.
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