摘要
基于1981~2020的长期实测气象资料,研究了合肥市区及郊区温度和热岛效应的时空变化趋势.结合2000~2020年的MODIS遥感数据,对合肥地区热岛情况进行验证,分析土地利用/土地覆盖类型和归一化植被指数与地表温度的相关性.结果表明,合肥地区存在明显的热岛效应,热岛区域在市中心,面积随时间向周围扩大.空气温度和地表温度均呈上升趋势,市区站和郊区站年平均气温分别升高2,1.5℃.夏季的热岛强度最大,最高达到1.7℃,而在冬季热岛效应最弱.随着城市发展,合肥建成区面积增加了约46.8%,绿地面积逐渐减少,且绿地面积与地表温度表现为显著负相关.白天地表温度与归一化植被指数为正相关关系;在夜间,归一化植被指数可以减缓温度增加,为负相关关系.本研究基于最新数据研究了合肥地区温度和热岛效应的时空变化,讨论了土地利用和植被覆盖对地表温度的影响,可以为研究城市热环境以及改善城市环境提供参考依据.
Based on the measured meteorological data from 1981 to 2020,the temporal and spatial trends of temperature and urban heat island(UHI)in urban and suburban areas of Hefei were studied.Combined with MODIS remote sensing data from 2000 to 2020,this paper verified the UHI in Hefei area,and then analyzed the correlation between land use/land cover(LULC)type and land surface temperature(LST),as well as the correlation between normalized vegetation index(NDVI)and LST.The results show that there was an obvious UHI effect over Hefei.The heat island area was in the center of the city,and the area expands with time.Both air temperature and surface temperature showed an upward trend,and the annual average temperature of urban and suburban increased by 2℃and 1.5℃,respectively.The urban heat island intensity(UHII)is the highest in summer,reaching 1.7℃,while the effect was the weakest in winter.With the development of the city,the built-up area of Hefei increased by about 46.8%,while the green space area gradually decreased,and the green space area shows a significant negative correlation with the LST.During the daytime,there is a positive correlation between LST and NDVI.At night,the NDVI can slow down the temperature increase at night,showing a negative correlation.Based on the latest data,this study studies the temporal and spatial variations of temperature and heat island effect in Hefei,and discusses the effects of land use and vegetation cover on LST,which can provide reference for the study of urban thermal environment and the improvement of urban environment.
作者
杨翠芹
何伟
邾茂盛
贾臻
徐昭
杨文
YANG Cui-qin;HE Wei;ZHU Mao-sheng;JIA Zhen;XU Zhao;YANG Wen(Department of Building Environment and Equipment,College of Civil Engineering,Hefei University of Technology,Hefei 230009,China;Qinghai College of Architectural Technology,Xining 810012,China)
出处
《中国环境科学》
CSCD
北大核心
2023年第S1期243-250,共8页
China Environmental Science
基金
中央高校基本科研业务费专项资金资助项目(PA2021KCPY0029)
安徽省重点研发计划项目(S202203f07020001)
关键词
合肥
城市热岛
地表温度
遥感
归一化植被指数
Hefei
urban heat island
land surface temperature
remote sensing
normalized difference vegetation index
