基于CWSI的广东省干湿时空分布特征及影响因素分析  

Spatial-temporal distribution characteristics and influencing factors of dry and wet in Guangdong Province based on CWSI

作　　者：王敏 陈晓旸 刘艳群 梁健[3] 黄观荣 李曹明 李轩 WANG Min;CHEN Xiaoyang;LIU Yanqun;LIANG Jian;HUANG Guanrong;LI Caoming;LI Xuan(Shaoguan Meteorological Service of Guangdong Province,Shaoguan 512028,Guangdong,China;Nanling Ecological Meteorology and Satellite Remote Sensing Application Engineering Technology Research Center of Shaoguan,Shaoguan 512028,Guangdong,China;Guangdong Meteorological Observatory,Guangzhou 510640,China)

机构地区：[1]广东省韶关市气象局,广东韶关512028 [2]韶关市南岭生态气象与卫星遥感应用工程技术研究中心,广东韶关512028 [3]广东省气象台,广东广州510640

出　　处：《干旱气象》2024年第4期527-535,共9页Journal of Arid Meteorology

基　　金：国家重点研发计划项目(2018YFC1507704);广东省气象局科学技术研究项目(GRMC2022Q19、GRMC2023Q09);韶关市科学技术局项目(230616148033947)共同资助。

摘　　要：分析广东省的干湿演变规律对加强水资源利用和维持生态环境稳定具有重要意义。本文基于2001—2021年中分辨率成像光谱仪(Moderate Resolution Imaging Spectroradiometer,MODIS)卫星蒸散遥感数据和86个国家气象站气温等观测数据,以作物缺水指数(Crop Water Stress Index,CWSI)为指标,采用Mann-Kendall趋势检验和贡献度分析方法,探讨广东省干湿时空分布特征及其主导气象因素。结果表明,广东省年CWSI呈显著下降趋势(-2.8×10^(-3) a^(-1)),四季中冬季下降趋势最明显(-7.0×10^(-3) a^(-1)),其次为秋季和春季,夏季最弱。空间分布上,年CWSI东南高(干)、西北低(湿)。广东北部、珠三角和西部部分地区的CWSI变异程度较低,肇庆和广东东部沿海地区则较高。四季中,广东西部CWSI值的变异程度普遍较低。相对湿度的变化是广东省CWSI趋势变化的主要驱动因素,影响了44.19%的站点,其次是风速(22.09%)、气温(18.61%)和日照时数(15.11%)。Analyzing the evolution of dry and wet in Guangdong Province is of great significance for strengthening water resource utili-zation and maintaining ecological environment stability.Based on evapotranspiration product of MODIS(Moderate Resolution Imaging Spectroradiometer)and meteorological observation stations data,choosing CWSI(Crop Water Stress Index)as the index of drought,Mann-Kendall(M-K)trend analysis and contribution methods were adopted to spatial-temporal distribution characteristics of CWSI as well as dominant meteorological factors.The results were indicated as follows:the annual CWSI indicated a downward trend through M-K trend test(-2.8×10^(-3) per year),season in year with the most significant downward trend was in winter(-7.0×10^(-3) per year),followed by autumn and spring,and the weakest was in summer.The annual CWSI was characterized by high(dry)in the southeast and low(wet)in the northwest.The CWSI in northern Guangdong,Pearl River Delta,and some areas in western Guangdong were at a lower degree of variation,while in Zhaoqing and the eastern coastal areas of Guangdong were relatively high.The CWSI in western Guangdong were all located at a lower degree of variation during the four seasons.The change of relative humidity was the overall dominant factor in the trend change of CWSI in Guangdong region,with spatial relative humidity being the dominant factor at 44.19%stations in Guangdong,followed by wind speed(22.09%),temperature(18.61%),and sunshine duration(15.11%).

关 键 词：MODIS 作物缺水指数 干湿变化 广东省 

分 类 号：P462.2[天文地球—大气科学及气象学]