【摘要】 以南京市江宁区某大学校园为研究区,利用无人机搭载热红外成像仪获取6种典型城市下垫面(水体、灌木、草坪、荷兰砖路面、大理石路面、沥青路面)地表温度数据,分析其在不同天气、不同月份的变化状况,并估算其感热释放量,定量描述不同下垫面地表温度的精细特征。通过对地表温度与气象因子进行相关性分析,探究地表温度变化的影响因素。结果表明:不同天气条件下,下垫面地表温度变化特征、感热释放量均存在差异。晴天时不同下垫面地表温度日变化波动较大,沥青路面温度相对较高,感热释放量最大,大理石、荷兰砖路面次之。水体和灌木在白天几乎没有感热释放量,对热环境缓解效应明显。阴天时不同下垫面地表温度日变化均不明显,人工地表仍然是感热释放的主体。气象因子中,太阳辐射和空气温度与下垫面温度呈正相关,对下垫面有增温作用,空气湿度与下垫面温度呈负相关,对下垫面增温具有一定的抑制作用。研究为城市微环境研究提供了新的思路和方法,并能够为城市微热环境遥感研究提供一定的理论依据。更多还原

【Abstract】 Taking a university campus in Jiangning District of Nanjing as the study area,we used an Unmanned Aerial Vehicle(UAV) mounted with a thermal infrared imager to map the land surface temperature of the study area for analysis of thermal variance and its change over different typical urban surface patterns.6 typical urban underlying surfaces(water,shrubs,grass,brick pavement,marble pavement and asphalt pavement) were identified in the study area.Thus,the objective of the study is to analyze the variation of the obtained land surface temperature among the surface patterns in the study area and to reveal the detailed characteristics of the LST changes under different weather conditions within a day and a month.The estimation of sensible heat release was conducted to quantitatively describe the fine characteristics of the surface temperature of different underlying surfaces.The influencing factors of surface temperature changes were investigated by correlating surface temperature with meteorological factors.The results showed that under different weather conditions,there were differences in the characteristics of surface temperature and sensible heat release on underlying surfaces.In sunny days,the diurnal variation of different underlying surfaces fluctuated greatly,the temperature of asphalt pavement was relatively high,and the sensible heat release was the largest,which had the greatest impact on the thermal environment,followed by the marble and brick pavement.The water and shrub almost had no sensible heat release during the day,and the remission effect on the thermal environment was obvious.In cloudy days,the diurnal variation of surface temperature on different underlying surfaces was not obvious and the artificial was still the main body of sensible heat release.Referring to meteorological factors,the solar radiation and the air temperature were positively correlated with the surface temperature of the underlying surface which had a warming effect on the underlying surface.The air humidity was negatively correlated with the temperature of the underlying surface,which played a role of cooling the land surface.This research will provide a new idea and method for the study of urban micro-thermal environment and a theoretical basis for the research of urban micro-thermal environment based on remote sensing.更多还原