Refined analysis of urban surface temperature based on optical fiber temperature measurement technology

The spatial configuration of the urban landscape is highly correlated with the heat island effect. By studying the land surface temperature(LST) of different underlying surfaces with high spatial and temporal resolution, we can grasp the temporal and spatial characteristics of the urban thermal environment more accurately. The optical fiber temperature sensing system has the advantages of real-time and high measurement accuracy and immunity to electromagnetic interference, and can monitor the LST in real time and continuously. In a park in Tongzhou, Beijing, four periods with solar radiation were selected, and the LST of various types of underlying surfaces was recorded in four consecutive hours with 1-minute time interval and 1-meter space interval, and the total length was 100 m. By analyzing the changes of LST of different underlying surface, it′s proved that this distributed optical fiber temperature measurement system can effectively identify temporal and spatial variability of LST on a small scale, distinguish between permeable and impervious grounds, monitor the heating rate of the surface temperature of asphalt road, and evaluate the cooling effect of shading on LST. At the same time, data obtained by this monitoring mode enables autocorrelation analysis of LST spatial sequence. The results verified that the LST spatial sequence still has autocorrelation on a small scale, and the closer the distance, the higher the correlation level. Simultaneously, it is confirmed by this practice that the optical fiber temperature measurement technology can be effectively applied to the observation and research of small-scale urban thermal environment.