摘要
城市扩张对地表热环境产生了显著的影响,正确认识城市地表温度的时空变异是研究城市生态问题的关键。本研究基于Landsat卫星TM、ETM+和OLI热红外数据,通过城市热岛效应强度和地表温度的梯度变化,对比分析北京和廊坊2000年和2015年两个时期地表热环境的时空变化。研究结果表明,从2000年到2015年北京与廊坊相比,夏季城市热岛效应强度变高,热岛期变长,城市核心区地表温度比廊坊增加明显;冬季北京城市核心区表现出冷岛效应减缓的趋势,冷岛期变短,市中心到城市边界温差变小。城市扩张快,规模大的城市,地表温度空间变化明显;城镇化较慢、规模相对较小的城市,城市扩张对城市热环境的影响可能被其他因素掩盖,表现不明显。
There are profound influences on urban surface thermal environment with urban expansion.It’s a key to study urban ecology how to understand correctly the spatial-temporal variation of urban surface temperature.By the thermal infrared data of TM,ETM+and OLI from Landsat,the temporal and spatial changes of surface thermal environment in Beijing and Langfang were compared through the gradient changes of urban surface temperature and the intensity urban heat island effect in 2000 and 2015.The results indicate that from 2000 to 2015,the intensity of urban heat island effect increased,the heat island period became longer,and the surface temperature in urban core area has gone up significantly in Beijing than Langfang in summer.In winter,the heat island effect in urban core area has tended to mitigate urban cold island effect,the cold island period has become shorter and the temperature difference between downtown and urban boundary becomes smaller in Beijing compared with Langfang from 2000 to 2015.With rapid urban expansion and larger scale,the spatial-temporal changes of land surface temperature become more obvious,with slower urbanization and relatively smaller scale,the impact of urban expansion on urban thermal environment may be concealed by other factors,which is not obvious.
作者
别小娟
孙然好
赵银兵
陈利顶
BIE Xiao-juan;SUN Ran-hao;ZHAO Yin-bing;CHEN Li-ding(College of Tourism and Urban-Rural Planning,Chengdu University of Technology,Chengdu 610059,China;State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《环境生态学》
2020年第4期9-17,共9页
Environmental Ecology
基金
国家自然科学基金重大项目(41590843)资助。
关键词
城市扩张
地表热环境
城市热岛效应
北京和廊坊
urban expansion
surface thermal environment
urban heat island effect
Beijing and Langfang
