利用2003-2020年的MODIS 土地覆盖类型和地表温度等数据,从地表温度、气温和城市化的角度分析了江苏省夏季城市热岛强度和面积的时空分布和变化趋势.结果表明:近20a快速的城市化导致了江苏省夏季热岛强度(0.07℃·a-1)和热岛面积(529 km2·a-1)整体均呈增加趋势;其中热岛强度前期受城区升温影响,呈明显增强(0.18℃·a-1),后期受郊区升温影响,呈明显减弱(-0.14 ℃·a-1);热岛面积变化主要由弱热岛面积(297 km2·a-1)和较强热岛面积(192 km2·a-1)的增长趋势主导,强热岛面积呈前期增长(133 km2·a-1)和后期减少(185 km2·a-1)的变化趋势;高温对整个城区的热岛效应影响有限,但对城市核心区的热岛效应影响明显,对应的强热岛面积增加和热岛强度增强.
By using MODIS land cover type and land surface temperature and other data from 2003 to 2020,the spatial-temporal distribution characteristics and change trends of summer urban heat island intensity and area in Jiangsu Province were analyzed from the perspective of land surface temperature,air temperature and urbanization.Results show that the summer heat island intensity(0.07 ℃ per year)and heat island area(529 km2 per year)in Jiangsu Province both have an overall increasing trend due to the rapid urbanization in recent 20 years.The heat island intensity increased significantly(0.18 ℃ per year)under the influence of urban warming in the early stage,and decreased significantly(-0.14 ℃ per year)under the influence of rural warming in the late stage.The variations of heat island area were mainly dominated by the increasing trend of weak heat island area(297 km2 per year)and the stronger heat island area(192 km2 per year),while the strongest heat island area increased in the early stage(133 km2 per year)and decreased in the late stage(185 km2 per year).In addition,high temperature has limited influence on the heat island effect in the whole urban area,but obvious influence on the heat island effect in the urban core area,with the corresponding increase in the strongest heat island area and the heat island intensity.