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Title

TRENDS ANALYSIS OF REFERENCE EVAPOTRANSPIRATION IN THE SYNOPTIC SITES OF KURDISTAN PROVINCE USING SPEARMAN’S TEST

Pages

 Start Page 216 | End Page 222

Abstract

 In this paper the Penman-Monteith reference evapotranspiration (FAO56) as well as the METEOROLOGICAL PARAMETERS such as wind speed, sunshine duration, humidity, and the maximum and minimum temperature trends at monthly, seasonal, and annual time scales were analyzedusing Spearman’s nonparametric test for four synoptic sites in KURDISTAN province in Iran. For each time series, trend lines were extracted using SEN’S ESTIMATOR. Also the sensitivity analysis of METEOROLOGICAL PARAMETERS was performed using step by step multiple linear regression method. Results indicated a significant increasing trend for reference evapotranspiration in Sanandaj station. The slope of trend lines for Sanandaj, Zarinhe and Bijar stations were positive on the monthly, seasonal, and annual time scales. In these three stations significant increasing trends were also observed for both winter and summer seasons. Trend analysis of the maximum temperature of Bijar and Sanandaj stations revealed an increasing trend for warm season. Sunshine duration and maximum temperature were found to be the most dominant variables influencing reference evapotranspiration in KURDISTAN province.

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