Characteristics of Surface Evapotranspiration and Potential Evapotranspiration in Guangdong Province from 2001 to 2022
Based on the evapotranspiration(ET)and potential evapotranspiration(PET)data of MO-DIS Version 6 remote sensing products from 2001 to 2022,the spatiotemporal distribution characteristics of ET and PET in Guangdong province from 2001 to 2022 were analyzed by means of correlation analysis,coef-ficient of variation and empirical orthogonal function decomposition.The results are shown as follows.ET is lower than PET,and the interannual change trend of ET and PET is relatively consistent,showing a trend of decreasing first and then increasing.The correlation coefficient between the two is 0.92,which passes the significance level test of 0.05.ET and PET generally show the spatial distribution characteristics of"being high in eastern and northern Guangdong-low in Pearl River Delta and western Guangdong".Annual ET and PET are dominated by high and relatively high fluctuation.The distribution of the first two spatial modes and time coefficients of ET and PET is relatively consistent,among which the spatial distribution of the first mode is both of the"provincial consistent type",and its distribution is similar to the spatial distribution of the an-nual average,showing the distribution of"being high in eastern and northern Guangdong-low in Pearl River Delta and western Guangdong".The spatial distribution of the second mode shows the type of"being posi-tive in the north-negative in the south".Before 2012,the spatial distribution was mainly"more in the north and less in the south",and it was the opposite after 2012.The third modal spatial distribution of ET is"positive in the east-negative in the west",which is"less in the east-more in the west"for 2018 and"more in the east-less in the west"for 2020-2021.The third modal spatial distribution of PET is"positive in the coastal area-negative in the inland area",which is"more in the coastal area-less in the inland area"for 2002,2015,and 2020-2021,and"less in the coastal area-more in the inland area"for 2009 and 2016.
climatologyevapotranspirationpotential evapotranspirationmedium resolution imaging spectrometerempirical orthogonal functionGuangdong province
万方数据
