| Based on the hourly air temperature data from 139 automatic stations in Fuzhou from 2012 to 2020, the spatiotemporal structure of Fuzhou urban heat island was studied and its causes were discussed. The results showed that the fine structure of Fuzhou urban heat island clearly demonstrated the characteristics of “polycentric” by encryption automatic stations, that is, besides the main heat island center in the downtown area of Fuzhou, there were two sub heat island centers in the urban area of Minqing County and Fuqing, and the heat island intensity was between 0.8 ℃ and 1.6 ℃. In addition, except for Yongtai and Minhou mountains, most areas showed positive heat island. In terms of the evolution trend of urban heat island, most of the suburbs and mountainous areas in Fuzhou showed a decreasing trend, while the increasing trend were only distributed in Minqing, Luoyuan coastal areas, eastern Yongtai, central city, southern Minhou, northern Fuqing, southern Changle, western Lianjiang etc., with a rate of 0 ℃～ 0.25 ℃ every 10 years. |
