川藏铁路沿线地表温度变化特征分析
Analysis of the Characteristics of Land Surface Temperature Changes along the Sichuan-Tibet Railway

本文主要研究川藏铁路沿线地表温度在季节和年代这两个时间尺度上的变化特征和长期趋势；研究川藏铁路沿线地表温度和关于经纬度和海拔高度的空间分布。本研究利用欧洲中期天气预报中心(ECMWF)提供的1950年至今陆地月平均再分析数据集和川藏铁路沿线100公里范围的空间数据文件，按照季节和年代进行时间序列分析，按照经纬度和海拔高度进行空间序列分析。结果表明：1) 川藏铁路沿线地表温度的空间分布规律，成雅段和林芝南部为高温区，昌都至林芝和拉林段南北两侧为低温区。2) 地表温度年变化均呈升温趋势，地表温度的升温率为0.07℃/10a。3) 夏季地表温度升温明显，升温率为0.1℃/10a。4)地表温度降温率为0.3℃/100 m，各海拔区间降温率不同，降温率随海拔增高而减小。
In this paper, we mainly study the variation characteristics and long-term trends of land surface temperature along the Sichuan-Tibet Railway on seasonal and decadal time scales. To study the spatial distribution of land surface temperature and latitude and altitude along the Sichuan-Tibet Railway. In this study, we used the monthly average reanalysis dataset provided by the European Centre for Medium-Range Weather Forecasts (ECMWF) from 1950 to the present and the spatial data file within 100 km along the Sichuan-Tibet Railway. Time series analysis was conducted by season and chronology, and spatial series analysis was conducted by latitude, longitude, and altitude. The results show that: 1) The spatial distribution of land surface temperature along the Sichuan-Tibet Railway is that the Chengya section and the southern part of Nyingchi are high temperature areas, and the north and south sides of the Qamdo-Nyingchi and Lalin sections are low temperature areas. 2) The annual variation of land surface temperature showed an increasing trend, and the warming rate of land surface temperature was 0.07°C/10a. 3) The surface temperature increased significantly in summer, and the warming rate was 0.1°C/10a. 4) The cooling rate of surface temperature is 0.3°C/100m, and the cooling rate of land surface temperature is different, and the cooling rate decreases with the increase of altitude.