基于MODIS数据的济南市城市热岛效应时空特征

Spatial and Temporal Characteristics of Urban Heat Island Effect in Jinan City Based on MODIS Data

根据2001-2012年MODIS/Terra和MODIS/Aqua两颗卫星八天的地表温度数据产品MOD11A2,结合GIS技术,分析了地表温度昼夜、季节和年际变化,得到了济南市热岛效应的时空变化特征.结果显示:济南市呈现出"一强一弱"两个热岛中心并存的热岛格局,同时夜间的热岛效应相对昼间较强,在空间分布上夜间热岛中心更加集中;春夏两季热岛效应最强,冬季最弱;近12年来济南市高温区面积没出现明显扩张,但夜间热岛效应有所增强,南部和北部低温区面积显著减少,形成多个次级热岛中心.研究结论对认识济南城市热岛时空变化特征及改善城市人居气候环境策略制定具有重要意义.

Based on the surface temperature data of MODIS/terra and MODIS/aqua satellites for eight days from 2001 to 2012,mod11a2,based on GIS technology,the temporal and spatial variation characteristics of thermal island effect in Jinan city were obtained by analyzing the diurnal,seasonal and interannual changes of surface temperature.The results showed that the heat island pattern appeared in Jinan city had two heat island centers,one is strong and another is weak,The heat island effect is the strongest in spring and summer and the weakest in winter;In recent 12 years,the area of the high temperature area in Jinan city did not expand obviously,but the effect of night heat island increased,and the area of south and north low temperature area decreased significantly,which forms several secondary heat island centers.The conclusion is of great significance for understanding the temporal and spatial variation characteristics of heat island in Jinan city and developing strategies for improving urban habitat climate and environment.