近20年太原城市群热岛演变遥感研究OACSTPCD

To reveal the temporal and spatial variation of the heat island effect in Taiyuan urban agglomeration,the MODIS(Moder-ate-resolution Imaging Spectroradiometer)surface temperature product(MYD11A2/MOD11A2)from 2003 to 2021 was used to ob-tain the long time series surface temperature of Taiyuan urban agglomeration,calculate the intensity of the heat island and divide the intensity,and analyze the change distribution characteristics and evolution law of the heat island in the urban agglomeration at the annual,quarterly,monthly and daily time scales.The results show that:(1)The heat island effect of Taiyuan urban agglomeration is generally growing,with the strongest heat island effect in 2019.In space,it is filled from the outside of Taiyuan basin to the inside;(2)Seasonal variation of heat island intensity in Taiyuan urban agglomeration is as follows:summer>spring>autumn>winter.Seasonal variation is closely related to the heat island effect in the eastern part of the urban agglomeration;(3)The heat island effect of Taiyuan urban agglomeration was gradually enhanced from January to June.The heat island area was distributed in the central part of Taiyuan urban agglomeration,and gradually weakened from July to December.The heat island distribution area was compact-ed from the Middle East to the southwest;(4)The area of heat island in the daytime of Taiyuan urban agglomeration is twice as large as that at night.The distribution of heat island at night is more dispersed than that at daytime,concentrated in the central area of the city,and at daytime,concentrated in the city's central area,and so does the distribution of cold island.This conclusion can provide a basis for future climate change research and ecological city construction in Taiyuan.