Abstract
Abstract. China has experienced rapid urbanization and rapid development of economy in the past decades, resulting in severe damage to the urban ecological environment, causing changes in the urban thermal environment and triggering the urban heat island effect. Moreover, the heat island effect has become a hot topic for scholars. The urban heat island effect refers to the phenomenon that the urban surface temperature is significantly higher than that of surrounding suburbs due to the interaction of man-made and natural. The city is considered to be the largest man-made ecosystem. Its heat island effect will not only change the growth habit of urban vegetation， but also affect the outer environment of urban buildings, it further influences human life and has a great negative impact on human health. Therefore, the study of the spatial-temporal variation characteristics of urban heat island effect and its influencing factors can provide data support for the environmental quality control and urban planning of local government departments. Based on the surface temperature remote sensing product data, we studied the spatial distribution characteristics of urban heat island effect in Wuhan from 2001 to 2013, by calculating the temperature difference between the highest and lowest temperatures and the average interval method for heat island classification. We conducted a trend analysis of vegetation cover from 2001 to 2013 initially explore the effects of vegetation cover n heat island effect. The results showed that: (1) From 2001 to 2013, the intensity of heat island in Wuhan was strong in the city center, weaker surrounding city center and the weakest in the suburbs; From 2001 to 2011, the intensity of heat island in Wuhan city was significantly weaken, among which Huangpi, Xinzhou, Jiangxia, Hannan and Caidian district were weaken, and the urban heat island effect of the city center was enhanced; From 2011 to 2013, the intensity of heat island in Wuhan city presented an increasing trend, among which Huangpi district, Xinzhou district and Caidian district were the most obvious, and the urban heat island effect was slightly weaken. (2) Between 2001 and 2013, the vegetation cover in Huangpi district and Xinzhou district increased significantly, and the vegetation cover in the downtown, Jiangxia district and Dongxihu district decreased significantly, corresponding to the urban heat island effect of Wuhan increased volatility. Our results showed that the spatial distribution of urban heat island effect in Wuhan city fluctuated with time during the study period, and the vegetation cover had a significant influence on it.
Highlights
Our results showed that the spatial distribution of urban heat island effect in Wuhan city fluctuated with time during the study period, and the vegetation cover had a significant influence on it
Urban heat island effect refers to the phenomenon that the temperature of urban area is obviously higher than that of surrounding suburbs under the combined action of human and nature.Because the suburban near-surface temperature changes slightly, while the urban near-surface temperature increases significantly, like a small island in the middle of the sea, it is called the urban heat island[1].As the most obvious product of urbanized environmental pollution, the heat island effect changes the thermal structure of urban underlying surface, making the environmental temperature value in the spatial model of temperature higher[2].With the accelerated development of urbanization economy,this heat island effect will
Referring to the relevant literature and the actual situation of surface temperature in Wuhan, the method of dividing surface heat field by equal interval is used to divide the surface temperature in July of 2002-2009 in Wuhan.After normalization, the surface temperature was divided into five levels, namely, low temperature zone (0 < UHI < 0.2), medium low temperature zone (0.2 < UHI < 0.4), medium temperature zone (0.4 < UHI < 0.6), sub-high temperature zone (0.6 < UHI < 0.8), high temperature zone (0.8 < UHI < 1).When the surface temperature field is divided into five levels, it is generally considered that the high temperature area and sub-high temperature area can represent the urban heat island area[9]
Summary
Urban heat island effect refers to the phenomenon that the temperature of urban area is obviously higher than that of surrounding suburbs under the combined action of human and nature.Because the suburban near-surface temperature changes slightly, while the urban near-surface temperature increases significantly, like a small island in the middle of the sea, it is called the urban heat island[1].As the most obvious product of urbanized environmental pollution, the heat island effect changes the thermal structure of urban underlying surface, making the environmental temperature value in the spatial model of temperature higher[2].With the accelerated development of urbanization economy,this heat island effect willCorresponding authorThis contribution has been peer-reviewed.The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLII-3/W10, 2020 International Conference on Geomatics in the Big Data Era (ICGBD), 15–17 November 2019, Guilin, Guangxi, China become more and more obvious, which will change the growth habits of urban vegetation, local climate[3], image air quality[4], physical and chemical properties of soil[5] and many other urban ecological processes.As one of the driving factors affecting the heat island effect, the change of the way, type and degree of urban greening construction will lead to the continuous appearance of negative environmental effects such as surface temperature rise and heat island effect.For a long time, scholars have used meteorology, remote sensing, numerical simulation and other research methods to study the heat island effect,Alonso et al used meteorology to analyze the urban heat island effect in Salamanca, Spain, under different weather types[6],In 2013, when Manju Mohan and other scholars used remote sensing data to retrieve the surface temperature of New Delhi, they found that the high temperature centers of urban heat island effect usually appeared in commercial centers and buildings[7],Hu Xiaoming et al simulated the boundary layer characteristics of Beijing on July 10 and 11, 2000 using a non-hydrostatic equilibrium moderate regime model[8].At present, many scholars focus their research on heat island effect on remote sensing data.According to the consistent correlation between surface temperature and meteorological temperature, the heat island grade is divided by normalizing the surface temperature, and the heat island grade is analyzed.by means of the inversion algorithm of surface temperature, the surface temperature of a certain area can be accurately divided.It is more convenient and accurate than other research methods.This paper is based on MODIS LST data and MODIS NDVI data of Wuhan from 2002 to 2009,Using equal interval method to classify heat island, the spatial distribution pattern and temporal variation characteristics of surface temperature were studied.Combined with the influence of vegetation coverage on surface temperature, it provides scientific reference for future urban planning and construction in Wuhan. Urban heat island effect refers to the phenomenon that the temperature of urban area is obviously higher than that of surrounding suburbs under the combined action of human and nature.Because the suburban near-surface temperature changes slightly, while the urban near-surface temperature increases significantly, like a small island in the middle of the sea, it is called the urban heat island[1].As the most obvious product of urbanized environmental pollution, the heat island effect changes the thermal structure of urban underlying surface, making the environmental temperature value in the spatial model of temperature higher[2].With the accelerated development of urbanization economy,this heat island effect will.
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