Effects of Land Use Change and Air Pollutants on Thermal Environment in Taiyuan City
COVID-19 epidemic urban lockdown is an important"window period"for studying the impact of reduced human activities on the urban thermal environment.The study selected the daytime MOD11A2 land surface temperature(LST)data,atmospheric environmental monitoring data(PM2.5,PM10,SO2,NO2,CO and O3)and land use data of Taiyuan City to explore the spatiotemporal changes and influencing factors of LST before and after the urban lockdown(from 2015 to 2021).The results showed that from 2015 to 2021,the area of construction land,forest land and water body in Taiyuan City increased,while the area of grassland decreased significantly.The LST of different land use types showed certain rules,namely con-struction land＞cultivated land＞water body＞grassland＞forest land.The contribution of construction land and cultivated land to urban heat island was the highest,and the cooling effect of forest land and grassland was significant.The reduction of air pollutants since 2017 was related to the city's environmental protection policies.The COVID-19 lockdown policy after 2020 promoted the further improvement of air quality.Air pollutants interacted with thermal environment.The slow increase of LST from 2017 to 2019 might be relat-ed to the increase of short-wave radiation caused by the decrease of PM2.5,and the increase of O3 in 2021 might be caused by the increase of LST.The effect of solar radiation on LST of forest land and grassland was relatively significant before and after COVID-19 lockdown.The increase of LST of different land use types in 2021 might be related to the significant reduction of atmospheric pollution particles.
land surface temperatureair pollutantsland useurban heat islandCOVID-19 impactTaiyuan City
NETL
NSTL
万方数据
