Investigation of Pan Evaporation paradox and Climatic Parameters Affecting it in Half-West and Center of Iran

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Nasrollahi Muhammad; ZOLFAGHARI ALI ASGHAR; YAZDANI MOHAMMAD REZA

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Paper Information

Journal: JOURNAL OF WATER AND SOIL RESOURCES CONSERVATION Year:2021 | Volume:11 | Issue:1 Page(s): 61-75

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Title

Investigation of Pan Evaporation paradox and Climatic Parameters Affecting it in Half-West and Center of Iran

Author(s)

Nasrollahi Muhammad | ZOLFAGHARI ALI ASGHAR | YAZDANI MOHAMMAD REZA | Issue Writer Certificate

Keywords

Evaporation paradoxQ1

Mann-KendallQ1

Pan EvaporationQ1

Sen's slope estimatorQ1

Abstract

Evaporation acts as an important component and a key control factor in land hydrological processes. In the context of global warming, Pan Evaporation demand is expected to increase, but the decrease in measured Pan Evaporation has challenged the hypothesis that climate change would increase evaporation. The main purposes of this study were (1) to investigate the existence of the Evaporation paradox, (2) to detect the temporal trends of Pan Evaporation and related climatic variables on an annual time scale. In this study the data of 50 synoptic weather stations in the half-west and center of Iran were used. Non-parametric tests Mann-Kendall and Sen's slope estimator were used to discover trend through time series. Results showed that Pan Evaporation in 10% and 28% of stations had a significant (p<0. 05) decreasing and increasing trend, respectively. But, trend analysis of mean temperature as a source of energy required for evaporation, indicated that 94% of the stations had increasing trend. Despite the increase in temperature in all stations, Evaporation paradox has occurred in 36% of stations and only in 10% of stations Evaporation paradox was significant at 5% level (p<0. 05). Data analysis in stations that had Evaporation paradox (with negative Pan Evaporation trend) indicated that a decrease in wind speed and sunshine duration and more increase in the minimum temperature compared to the maximum temperature, were the main climatic parameters that control the rate of Pan Evaporation. Pan Evaporation decreasing in arid and semiarid areas of Iran is important in climatic studies. Therefore, the results of this study are important for better management of water resources in Iran.

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APA: Copy

Nasrollahi, Muhammad, ZOLFAGHARI, ALI ASGHAR, & YAZDANI, MOHAMMAD REZA. (2021). Investigation of Pan Evaporation paradox and Climatic Parameters Affecting it in Half-West and Center of Iran. JOURNAL OF WATER AND SOIL RESOURCES CONSERVATION, 11(1 ), 61-75. SID. https://sid.ir/paper/411262/en

Vancouver: Copy

Nasrollahi Muhammad, ZOLFAGHARI ALI ASGHAR, YAZDANI MOHAMMAD REZA. Investigation of Pan Evaporation paradox and Climatic Parameters Affecting it in Half-West and Center of Iran. JOURNAL OF WATER AND SOIL RESOURCES CONSERVATION[Internet]. 2021;11(1 ):61-75. Available from: https://sid.ir/paper/411262/en

IEEE: Copy

Muhammad Nasrollahi, ALI ASGHAR ZOLFAGHARI, and MOHAMMAD REZA YAZDANI, “Investigation of Pan Evaporation paradox and Climatic Parameters Affecting it in Half-West and Center of Iran,” JOURNAL OF WATER AND SOIL RESOURCES CONSERVATION, vol. 11, no. 1 , pp. 61–75, 2021, [Online]. Available: https://sid.ir/paper/411262/en

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