基于FY-3C/VIRR地表温度数据的上海市热岛效应时空特征分析

城市热岛效应是当前城市生态领域关注的焦点问题之一。本文以上海为例,基于FY-3C/VIRR LST数据,通过计算研究区的热岛强度指数与热岛比例指数,定量分析上海市2019年全年城市热岛效应的时空变化特性。结果表明：上海市2019年全年各月份的总热岛区域面积均在40%以上,城市热岛效应较为显著,其中7月份总热岛区域面积最大;上海市热岛效应的空间分布呈现出“北热南冷”的格局,热岛效应主要分布在中部和北部; 上海市5—7月热带比例指数较高,为较严重热岛,随着8月份平均地表温度的继续升高,热岛比例指数有所下降。

Temporal and spatial characteristics of heat island effect in shanghai based on FY-3C/VIRR LST

Urban heat island (UHI) effect is one of the most important issues in urban ecology. Based on FY-3C/VIRR LST data, the temporal and spatial variation characteristics of urban heat island effect in Shanghai in 2019 were quantitatively analyzed by calculating heat island intensity index and heat island proportion index in the study area. The results show that : the total heat island area of Shanghai in 2019 is more than 40%, and the urban heat island effect is significant, and the total heat island area of Shanghai in July is the largest; the spatial distribution of the heat island effect in Shanghai presents a pattern of "hot in north and cold in south", and the heat island effect is mainly distributed in the central and northern part of Shanghai; the tropical proportion index of Shanghai was relatively high from May to July, and it was a serious heat island. With the continuous increase of average surface temperature in August, the heat island proportion index decreased.