西藏阿里地区地表温度反演及其影响因素响应特征  

Study on the Land Surface Temperature Inversion and Its Influencing Factor Response Characteristics of Ali Region,TAR

作　　者：徐涛 洪卫丽 杜玉龙 鱼静 李浩辙 XU Tao;HONG Weili;DU Yulong;YU Jing;LI Haozhe(Shaanxi Regional Geology and Mineral Research Institute Co,Xianyang 712000,China)

机构地区：[1]陕西地矿区研院有限公司,陕西咸阳712000

出　　处：《高原科学研究》2024年第2期14-24,共11页Plateau Science Research

基　　金：地区本级财政应用技术研究与开发生态安全屏障保护及生态环境治理类重点研发及转化专项项目(ALKJ-BJCZ-2022-04).

摘　　要：地表温度是衡量区域生态环境的重要指标之一。西藏自治区阿里地区地处青藏高原西北部,属全球气候变化敏感区,探究阿里地区地表温度的时空分布及相关影响因素,对研究该地区热环境变化过程、监测基础生态变化具有重要意义。文章以2000—2020年间阿里地区TRIMSLST-TP产品为数据源,采用归一化分级方法将LST划分为5个等级,进而采用趋势分析及重心迁移等方法研究阿里地区20年间地表温度时空演变特征,同时选取DEM、NDVI及草地覆盖度3个地表参数,探讨LST影响因子的作用效力。结果表明:(1)阿里地区LST除中温区面积减少外,其余温区面积均有所增加,增加面积由小到大依次为:低温区<次低温区<高温区<次高温区;(2)2000—2020年阿里地区LST年际变化规律为波动下降-迅速上升-小幅下降-缓慢上升,年均温度增长0.06℃;(3)2000—2020年阿里地区低温区、次低温区及中温区重心呈现从东北向西南迁移趋势,次高温区与高温区重心呈现西南向东北方向迁移的趋势;(4)影响因素中,DEM对LST影响为负向,NDVI和草地覆盖度对LST影响为正向。Land surface temperature is one of the important indexes for measuring the ecological environment.Ali is located in the northwestern part of the Qinghai-Tibet Plateau and is a climate change sensitive area.Studying the temporal and spatial distribution of land surface temperature and its associated influencing factors is of great importance for understanding the process of thermal environmental change and monitoring the basic ecological changes in this area.In this paper,the Land Surface Temperature(LST)data of TRIMS LST-TP products of Ali area from 2000 to 2020 was used to study the temporal and spatial evolution of land surface temperature of this area and its influencing factors using the normalized grading method,the trend method as well as the center of gravity migration method.Meanwhile,three land surface parameters,namely,DEM,NDVI,and grass cover,were employed to explore the effectiveness of LST influencing factors.Our results indicate that except for the decrease of the area of the mid-temperature zone from 2000 to 2020,the area of the other temperature zones in Ali area increased,and the comparison of increasing area size is as follows:low-temperature zone<sub-low-temperature zone<high-temperature zone<sub-high-temperature zone.Moreover,the annual averaged temperature increase is found to be 0.06℃ from 2000 to 2020 in this area with the interannual variation of LST of fluctuating decline-rapid increase-slow decline-small increase.Furthermore,the center of gravity shows a northeast-to-southwest migration trend for the low-temperature zone,sub-low-temperature zone,and medium-temperature zone from 2000 to 2020,while it shows a southwest-to-northeast migration trend for sub-high-temperature zone and high-temperature zone.Furthermore,regarding the influencing factors,DEM has a negative influence on LST,and NDVI and grass cover have a positive influence on LST.

关 键 词：地表温度 时空演化 归一化植被指数 时空分布 气候变化 阿里地区 

分 类 号：P423.7[天文地球—大气科学及气象学]