Different Patterns in Daytime and Nighttime Thermal Effects of Urbanization in Beijing-Tianjin-Hebei Urban Agglomeration

摘要: Surface urban heat island (SUHI) in the context of urbanization has gained much attention recent decades; however, seasonal variations SUHI and their drivers are still not well documented. In this study, Beijing-Tianjin-Hebei (BTH) agglomeration, one most typical areas experiencing drastic China, was selected to study intensity (SUHII) based on remotely sensed land surface temperature (LST) data. Pure unchanged rural pixels from 2000 2010 were chosen avoid non-concurrency between cover data LST estimate daytime nighttime thermal effects urbanization. Different patterns found SUHIIs. Specifically, SUHII summer (4 °C) more evident than other seasons while a cold phenomenon winter; always positive higher all except summer. Moreover, we highest August, which is growing peak stage maize, showed trough same month. Seasonal significant correlations with ∆LAI (leaf area index) (R2 = 0.81, r −0.90) compared ∆albedo 0.61, −0.78) background 0.69, 0.83); moreover, agricultural practices (double-cropping system) played an important role SUHII. did show either ∆LAI, ∆albedo, LST, implies different mechanisms variation needing future studies.