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- Title
中国主要省会城市地表与冠层热岛日内逐时变化特征差异研究.
- Authors
苏, 博阳; 占, 文凤; 杜, 惠琳; 江, 斯达; 王, 晨光; 董, 攀; 王, 春丽; 刘, 紫涵
- Abstract
Investigations into the diurnal evolution differences between surface urban heat islands and canopy urban heat islands (termed I s and I c, respectively) hold great values in enhancing our comprehension of the vertical structure of urban climates at a fine time-scale. However, the hourly surface air temperature (T a) from densely distributed weather stations within cities and the hourly land surface temperature (T s) that possesses a relatively high spatial resolution and that can be employed for monitoring thermal conditions of urban surfaces are largely lacking. Previous studies comparing hourly I s and I c have mostly focused on individual cities. In this work, we utilize hourly T a measurements from high-density meteorological stations (1544 stations) and T s observations derived from a Diurnal Temperature Cycle (DTC) model to examine the hourly I s and I c and the associated hourly differences (quantified as ΔUHI, calculated by subtracting I s from I c) over 27 Chinese megalopolises. Furthermore, we analyze the hourly patterns of ΔUHI (e.g., maximum ΔUHI, minimum ΔUHI, and duration of ΔUHI > 0) across cities with different climate backgrounds and city sizes. We obtain the following findings: (1) at the national scale, the annual mean ΔUHI remains positive throughout the diurnal cycle. The hourly ΔUHI pattern generally exhibits a peak shape, with the ΔUHI increasing from morning and reaching its maximum (1.7 ℃) at around 4:00 PM. Subsequently, it gradually decreases and reaches its daily minimum (0.1 ℃) at around 2:00 AM, with the most rapid decline occurring around sunset. (2) Across different climate zones, from subtropical to temperate cities, the maximum and minimum ΔUHIs follow a decreasing trend, the times at which they occur are gradually delayed, and the duration of ΔUHI greater than 0 ℃ gradually decreases. (3) For cities with different sizes, the variation magnitude of ΔUHI curve generally decreases and the time of minimum ΔUHI advances as city size increases. The duration of ΔUHI greater than 0 ℃ also increases with city size. This study can promote the understanding of the contrasting patterns between hourly differences in surface urban heat islands and canopy urban heat islands across cities with diverse background climates. The research results contribute to a deeper understanding of the vertical spatial characteristics of urban heat islands at a fine time scale.
- Subjects
URBAN heat islands; CLIMATIC zones; LAND surface temperature; URBAN climatology; CITIES &; towns
- Publication
Journal of Remote Sensing, 2024, Vol 28, Issue 8, p1885
- ISSN
1007-4619
- Publication type
Article
- DOI
10.11834/jrs.20243362