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Trends in reference crop evapotranspiration in Urmia Lake basin

Arabian Journal of Geosciences, ISSN: 1866-7538, Vol: 13, Issue: 10
2020
  • 17
    Citations
  • 0
    Usage
  • 14
    Captures
  • 0
    Mentions
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    17
    • Citation Indexes
      17
  • Captures
    14

Article Description

Evapotranspiration is one of the main important components of hydrologic cycle. Trend analysis of reference crop evapotranspiration (ET) provides useful information for understanding the crop water requirements associated with climate change. In this study, monotonic trends were analyzed in monthly, seasonal, and annual timescales at the nine stations selected from Urmia Lake basin. The Mann-Kendall method was used for trend detection. Significant autocorrelation coefficients were taken into account in analysis using the modified version of Mann-Kendall method. In order to estimate the slope of trend line, the Sen’s estimator method was used. The ET values estimated using the standard recommended form of the FAO-56 Penman-Monteith. The results showed that more than 66.6% of the annual ET time series had positive trends which were significant at 0.10 level. The highest slope of annual ET trends belonged to the station Marageh, which was equal to 17.34 mm/year. In the seasonal scale, all of the sites (except Tekab) exhibited significant upward trends for spring season in 0.1 level. In the monthly timescale, unless 6.5% of the tested time series, all of them had downward trends. Analysis of the impacts of climatic variables on trends in ET showed that the reason for increasing trends in ET was attributed to the increasing trends in both mean air temperature and wind speed, as well as the decreasing trend in the mean relative humidity. Wise use of fresh water in this fragile ecosystem is recommended for future sustainable agricultural activities.

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