广东省2001—2022年地表蒸散发和潜在蒸散发特征  

Characteristics of Surface Evapotranspiration and Potential Evapotranspiration in Guangdong Province from 2001 to 2022

作　　者：王敏 张卫彪 李曹明 李丽芳 陈晓旸 WANG Min;ZHANG Weibiao;LI Caoming;LI Lifang;CHEN Xiaoyang(Shaoguan Meteorological Service,Shaoguan 512026;Renhua Meteorological Service,Renhua 512026)

机构地区：[1]韶关市气象局,广东韶关512026 [2]仁化县气象局,广东仁化512026

出　　处：《广东气象》2024年第5期26-30,共5页Guangdong Meteorology

基　　金：广东省气象局科学技术研究项目(GRMC2022Q19)。

摘　　要：基于2001—2022年MODIS第6版遥感产品数据的蒸散发(ET)和潜在蒸散发(PET)数据,利用相关性分析、变异系数和经验正交函数分解等方法,分析广东省2001—2022年ET和PET的时空分布特征,结果表明:(1)ET低于PET,ET和PET的年际变化趋势较为一致,呈现先减小后增大的趋势,两者的相关系数为0.92,通过0.05的显著性水平检验;(2)ET和PET总体上均呈现“粤东和粤北高-珠三角和粤西地区低”的空间分布特征;(3)年ET和PET以高波动性和较高波动性为主;(4)ET与PET的前2个空间模态及时间系数分布较为一致,其中第1模态空间分布均表现为“全省一致型”,其分布与年平均值的空间分布较为相似,呈现“粤东和粤北高-珠三角和粤西地区低”的分布;第2模态空间分布呈“北正-南负”的空间分布型,2012年之前,以“北多南少”空间分布为主,2012年之后则为相反的分布型;ET的第3模态空间分布型为“东正-西负”型,其在2018年表现为“东少-西多”,在2020—2021年表现为“东多-西少”;PET的第3模态空间分布型为“沿海正-内陆负”,其在2002、2015、2020—2021年为“沿海多-内陆少”空间分布;在2009、2016年呈“沿海少-内陆多”空间分布。Based on the evapotranspiration(ET)and potential evapotranspiration(PET)data of MODIS 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,coefficient 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 annual 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 positive 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.

关 键 词：气候学 蒸散发 潜在蒸散发 中分辨率成像光谱仪 经验正交函数 广东省 

分 类 号：P46[天文地球—大气科学及气象学]