基于温度日内循环模型的全球主要城市地表热岛面积时空格局遥感研究  

Spatiotemporal Patterns of Surface Urban Heat Island Area Across Global Major Cities based on Diurnal Temperature Cycle Model

作　　者：张先冉 占文凤[1,2] 缪诗祺 杜惠琳 王晨光 江斯达 ZHANG Xianran;ZHAN Wenfeng;MIAO Shiqi;DU Huilin;WANG Chenguang;JIANG Sida(International Institute for Earth System Science,Nanjing University,Nanjing 210023,China;Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application,Nanjing 210023,China)

机构地区：[1]南京大学国际地球系统科学研究所,江苏南京210023 [2]江苏省地理信息资源开发与利用协同创新中心,江苏南京210023

出　　处：《遥感技术与应用》2023年第4期842-854,共13页Remote Sensing Technology and Application

基　　金：国家自然科学基金项目(42171306)。

摘　　要：随着全球城市化进程的不断推进,地表城市热岛(Surface Urban Heat Island,SUHI)效应日益加剧。厘清SUHI面积时空格局对于全面了解SUHI效应时空变化规律至关重要。基于MODIS(Moderate-resolution Imaging Spectroradiometer)地表温度数据,结合高斯模型和地表温度日内循环模型(Diurnal Temperature Cycle,DTC)计算了全球504个主要城市2000~2019年的SUHI面积比例(SUHI Ratio,I_(R))——即SUHI面积与城区面积的比值,并在不同时间尺度上(日内逐时、季节对比、年际变化)分析了全球及不同气候区城市的I_(R)变化特征。结果显示:就空间特征而言,全球城市多年I_(R)均值在白天和夜间分别为0.85和0.75,其中寒带气候区城市的多年平均I_(R)(日夜分别为0.94和0.86)显著大于干旱、热带和温带气候区城市。就时间特征而言,日内尺度上全球及各气候区城市I_(R)的变化趋势呈现相同规律,均在日出后先下降后上升,分别于日出后3 h和7 h达到最小和最大值,而后波动下降并渐趋稳定;季节尺度上全球城市夏季I_(R)(日夜分别为0.86和0.76)略高于冬季(日夜分别为0.81和0.72),干旱、寒带和温带气候区I_(R)季节变化与此一致,热带气候区则呈现相反规律;年际尺度上白天54%的城市年均I_(R)呈增大趋势,夜晚则有62%的城市年均I_(R)呈减小趋势。本研究填补了对全球尺度下SUHI面积时空格局的认识,详细揭示了SUHI面积比例在不同时间尺度和不同气候区之间的变化特征,研究结果有助于加深对SUHI效应的理解。In the context of global warming and urbanization,the recent decades have been witnessing intensify⁃ing Surface Urban Heat Island(SUHI)effect.Investigations on the spatiotemporal patterns of SUHI area(SUHIA)are crucial for better understanding the SUHI effect.By combining MODIS(Moderate-resolution Imaging Spectroradiometer)land surface temperature data,Gaussian model,and Diurnal Temperature Cycle(DTC)model,here we calculated the ratios of SUHI area to urban area(I_(R))of 504 global major cities during 2000~2019.We further analyzed the hourly,seasonal,and inter-annual variations in I_(R) across different climate zones.The results show that:(1)In terms of the spatial patterns,the multi-year average daytime and night⁃time I_(R) of global major cities are 0.85 and 0.75,respectively,with a significantly larger I_(R) in snow climate zone(0.94 and 0.86 for daytime and nighttime,respectively)than in arid,equatorial and warm climate zones.(2)On the hourly time-scale,the I_(R) patterns are very similar across different climate zones.The I_(R) firstly decreases and then increases after sunrise,reaching the minimum and maximum at 3 hours and 7 hours after sunrise,re⁃spectively;and it then decreases in volatility and finally becomes stable.(3)On the seasonal scale,the global mean I_(R) is larger in summer(0.86 and 0.76 for day and night,respectively)than in winter(0.81 and 0.72 for day and night,respectively).The seasonal variations of I_(R) in arid,snow and warm climate zones are similar to those on a global scale,while the situation is reversed in equatorial climate zone.(4)On the inter-annual scale,the annual mean I_(R) shows an increasing trend in 54%of global cities during the daytime,while it shows a de⁃creasing trend in 62%of global cities at night.This study reveals the spatial patterns of SUHI area at multiple time scales,and compares these temporal variations among different climate zones.Our findings contribute to a better understanding of the spatiotemporal patterns of SUHI effect.

关 键 词：地表城市热岛(SUHI) 热红外遥感 地表城市热岛面积 地表温度 时空格局 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]