Meteorological Factors Affecting Pan Evaporation in the Haihe River Basin, China

• Main Authors: Zhihong Yan, Shuqian Wang, Ding Ma, Bin Liu, Hong Lin, Su Li
• Format: Article
• Language: English
• Published: MDPI AG 2019-02-01
• Series: Water
• Subjects: evapotranspiration; Pan evaporation; TFPW-MK; Haihe River Basin
• Online Access: https://www.mdpi.com/2073-4441/11/2/317

Pan evaporation (<i>E_pan</i>) is an important indicator of regional evaporation intensity and degree of drought. However, although more evaporation is expected under rising temperatures, the reverse trend has been observed in many parts of the world, known as the “pan evaporation paradox”. In this paper, the Haihe River Basin (HRB) is divided into six sub-regions using the Canopy and <i>k</i>-means (The process for partitioning an <i>N</i>-dimensional population into <i>k</i> sets on the basis of a sample is called “<i>k</i>-means”) to cluster 44 meteorological stations in the area. The interannual and seasonal trends and the significance of eight meteorological indicators, including average temperature, maximum temperature, minimum temperature, precipitation, relative humidity, sunshine duration, wind speed, and <i>E_pan</i>, were analyzed for 1961 to 2010 using the trend-free pre-whitening Mann-Kendall (TFPW-MK) test. Then, the correlation between meteorological elements and <i>E_pan</i> was analyzed using the Spearman correlation coefficient. Results show that the average temperature, maximum temperature, and minimum temperature of the HRB increased, while precipitation, relative humidity, sunshine duration, wind speed and <i>E_pan</i> exhibited a downward trend. The minimum temperature rose 2 and 1.5 times faster than the maximum temperature and average temperature, respectively. A significant reduction in sunshine duration was found to be the primary factor in the <i>E_pan</i> decrease, while declining wind speed was the secondary factor.