湖南省地表高温遥感评估指标构建和特征分析  

Surface high temperature remote sensing evaluation index construction and characteristic analysis in Hunan Province

作　　者：韩沁哲[1,2] 刘海磊 范嘉智[2,4] 吴浩 陈磊士 欧小锋[1,2] 韩沁真 HAN Qinzhe;LIU Hailei;FAN Jiazhi;WU Hao;CHEN Leishi;OU Xiaofeng;HAN Qinzhen(Hunan Meteorological Research Institute,Changsha 410118,China;Hunan Key Laboratory of Meteorological Disaster Prevention and Reduction,Changsha 410118,China;Chengdu University of Information Technology,Chengdu 610225,China;China Meteorological Administration Training Centre Hunan Branch,Changsha 410125,China;Hunan Climate Center,Changsha 410118,China;Changsha Meteorological Bureau of Hunan Province,Changsha 410205,China)

机构地区：[1]湖南省气象科学研究所,湖南长沙410118 [2]气象防灾减灾湖南省重点实验室,湖南长沙410118 [3]成都信息工程大学,四川成都610225 [4]中国气象局气象干部培训学院湖南分院,湖南长沙410125 [5]湖南省气候中心,湖南长沙410118 [6]湖南省长沙市气象局,湖南长沙410205

出　　处：《干旱气象》2024年第3期367-375,共9页Journal of Arid Meteorology

基　　金：湖南省自然科学联合基金项目(2023JJ60542);湖南省气象局重点项目(XQKJ18A003);国家自然科学基金项目(42005058);中国气象局气象能力提升联合研究专项重点项目(22NLTSZ003)共同资助。

摘　　要：基于长时序遥感产品构建地表高温评估指标,分析湖南省近20 a地表高温分布特征,可为农业生产和防灾减灾提供技术参考。首先利用2002—2021年的MYD11A1、MYD13A1、MYD09GA长时序数据回归计算日地表高温数据集,然后基于百分比法、百分位法和趋势比率法构建地表高温遥感评估指标,并分析其时空分布特征。结果表明,使用日地表温度大于等于45℃面积占比作为日尺度的地表高温等级阈值划分指标与气象预警指标一致性最好,湖南省地表高温年最大值以2013年为转折点增加显著;基于百分位法确定的湖南省年尺度的地表高温极端阈值(40.2~64.1℃),可作为高温强度的评价指标;利用湖南省地表高温趋势率来评价湖南省地表高温年增减趋势具有较好的应用价值,长株潭城市群和洞庭湖区的快速增温、衡邵干旱走廊的极端高温需要重点关注。Based on long-term remote sensing products,this paper constructs evaluation indicators for surface high temperatures and analyzes the distribution characteristics of surface high temperatures in Hunan Province over the past 20 years,aiming to provide technical references for agricultural production,disaster prevention and mitigation.Firstly,the daily surface high temperature dataset are calculated using long-term data regression of MYD11A1,MYD13A1 and MYD09GA from 2002 to 2021.The percentage method,percentile method and trend ratio method are used to construct remote sensing evaluation indicators for surface high temperatures,then the spatial and temporal distribution characteristics of surface high temperatures are analyzed.The results indicate that when using the proportion of areas with daily surface temperatures greater than or equal to 45℃as the threshold for classifying surface high temperature levels on a daily scale,it aligns best with meteorological warning indicators.The annual maximum surface high temperature in Hunan Province showed a significant increase with 2013 as a turning point.The extreme threshold for annual surface high temperatures in Hunan Province(ranging from 40.2 to 64.1℃),determined using the percentile method,can serve as an evaluation metric for high temperature intensity.Additionally,using the trend rate of surface high temperatures in Hunan Province to evaluate the increase or decrease trends of annual surface high temperatures has good application value.Rapid warming in the Changsha-Zhuzhou-Xiangtan urban agglomeration and the Dongting Lake area,as well as extreme high temperatures in the Hengshao drought corridor,require special attention in the future.

关 键 词：地表高温 评估指标 高温等级 卫星遥感 

分 类 号：P423.3[天文地球—大气科学及气象学]