| Urban heat island(UHI)effect describes the phenomenon of higher temperatures occurring in urban areas than in the surrounding suburban/rural areas.Since the influence of the rapid urbanization,the UHI has become more and more serious which can have a great influence onthe quality of life and human well-being in urban areas and also can worsen global warming effect.Hence,it is necessary to research and perceive the evolution characteristics and influence factors of the UHI and urban thermal environment(UTE).Nowadays,remote sensing technology has been widely applied in the research of UTE.The important advantage of using remotely sensed data is the wall-to-wall continuous coverage of the urban area which can meet the needs of space continuous analysis of UTE.However,the influences of sensor fault and/or cloud cover as well as the trade-off between the temporal and spatial resolutions,make the remotely sensed data existing spatial and temporal uncontinual problem.Hence,it is difficult to obtain continuous fine-scale satellite data for UTE analysis which impede the progress of the subtle urban thermal environment research.This contradiction between supply and demand for satellite data is a very common problem in UTE research.To relieve this contradiction,spatial-temporal fine scale land surface temperature generation strategy(STFSLST)is employed to obtain time-intensive/long-term and fine-scale(Landsat-like)land surface temperature(LST)as well as land surface reflectivity(LSR)data sets of Wuhan and Wuhan Metropolitan Area by integrating the observations of Terra/Aqua MODIS,Landsat5 TM,Landsat7 ETM+,Landsat8 OLI/TIRS,and NOAA AVHRR.At first,to study the diurnal variability of the Surface Urban Heat Island in different seasons in Wuhan within one year.Then,extension in temporal,studying the evolution characteristic of summer UTE in Wuhan for 26 years(1988-2013).At last,extension in spatial,the evolution characteristic of summer and winter diurnal UTE in Wuhan Metropolitan Area has been implemented.More detailes can find as below:(1)The subtle analysis of the diurnal variability of the Surface Urban Heat Island in different seasons in WuhanSpatial-temporal fine scale land surface temperature generation strategy(STFSLST)is applied to obtain the time-intensive and fine-scale(Landsat-like)diurnal land surface temperature(LST)data sets by integrating the observations of Terra MODIS,Landsat5 TM,and Landsat7 ETM+.Based on this data set,the main objectives are:1)to subtle analyze the difference in seasonal variability of the SUHI between daytime and nighttime,and 2)to subtle analyze the difference in diurnal variability between the different seasons,and 3)combating with the normalized difference vegetation index(NDVI),the impervious surface fraction(ISF),and the vegetation fraction(VF),to subtle analyze the factors which cause the SUHI effect variation in daytime and nighttime.(2)The subtle analysis of the long-term and fine-scale evolution characteristic of UTE in WuhanSpatial-temporal fine scale land surface temperature generation strategy(STFSLST)is applied to obtain long-term and fine-scale(Landsat-like)diurnal land surface temperature(LST)data sets by integrating the observations of NOAA AVHRR,Terra MODIS,Landsat5 TM,Landsat7 ETM+,and Landsat8 OLI/TIRS.Based on this data set,to qualitatively and quantificationally analyze the evolution characteristic of summer UTE in Wuhan for 26 years(1988-2013).For qualitative analysis,overall and local subtly analyzing the UTE evolution law and the factors which cause the high temperature transfer in Wuhan.For quantificationally analysis,by using the heat aggregation indicator and traditional SUHI intensity indicator,to subtly analyze the SUHI intensity evolution law.On the other hand,to analyze the factors which cause the SUHI intensity change,the spatio-temporal relationships of LST with the NDVI,the VF,and the ISF are illustrated in a three-dimensional mode by integrating the NDVI,the VF,and the ISF data.(3)The subtle analysis of evolution characteristic and the siphon effect of the UTE in Wuhan Metropolitan AreaSpatial-temporal fine scale land surface temperature generation strategy(STFSLST)is applied to obtain long-term(2002-2015)and fine-scale(Landsat-like)summer and winter diurnal land surface temperature(LST)data sets by integrating the observations of Terra MODIS,Landsat5 TM,Landsat7 ETM+,and Landsat8 OLI/TIRS in Wuhan Metropolitan Area.On the basis of two previous researches,to expand the research from Wuhan to a bigger space dimension(Wuhan Metropolitan Area)in the study.At first,the evolution characteristic of summer and winter diurnal UTE of Wuhan Metropolitan Area has been implemented by qualitative and quantitative analysis which emphasis on analyzing the evolution characteristic of UTE for each city and its thermal environment level in Wuhan Metropolitan Area.And then,combined with the mutual influence factors between each city,to subtle analyze the UTE siphon effect for each city in Wuhan Metropolitan Area. |
PDF Full Text Request