Characteristics And Correlation Of Land Surface Temperature And Aerosol Optical Depth In Urumqi

In the process of the continuous development of the city,the environment is also changing.On the one hand,it is affected by natural factors,on the other hand,it is inseparable from human factors,such as population flow,landscape reconstruction,human production and life style and economic development.Urban temperature rise and air pollution will bring trouble to human production and life.Aerosol and surface temperature affect each other.Studying the correlation and influencing factors between land surface temperature and aerosol optical depth is of great significance to urban planning and environmental governance.The correlation between land surface temperature and aerosol optical depth and its driving factors are studied.Using a variety of remote sensing data,the temporal and spatial distribution characteristics of day and night land surface temperature and aerosol optical depth are obtained through data processing and data analysis.Finally,the correlation between them is analyzed to obtain the results of correlation degree.The driving factors of aerosol optical depth are analyzed by using geographic detectors,and the impact on them is explored from the type of land use,and the impact mechanism is explored according to relevant data.Finally,reasonable suggestions on urban planning and environmental governance are put forward.The main conclusions are as follows:(1)The monthly average of daytime and nighttime land surface temperature in Urumqi is the largest in July and the smallest in January.In the seasonal variation,the land surface temperature is the highest in summer and the lowest in winter.In the annual variation,the land surface temperature has increased from 2010 to 2020.According to the spatial distribution characteristics of land surface temperature,the area that is in the middle temperature area or sub high temperature area during the day may be in the high temperature area at night.The south of Toutun,the northeast of shayibak,the north of Tianshan District,the west of Shuimogou District,the south of Midong District and the south of new urban area are mainly urban built-up areas,and the relative land surface temperature at night is greater than that during the day.(2)The monthly mean aerosol optical depth in Urumqi is larger in February and April and smaller in November and January.In the seasonal variation,the aerosol optical depth is the highest in spring and the lowest in winter.In the annual variation,the aerosol optical depth increased as a whole from 2010 to 2020.The higher values mostly appear in Midong district and Dabancheng district.The aerosol optical depth in the built-up area in spring and autumn is significantly higher than that in the surrounding areas,indicating the distribution difference between cities and suburbs.(3)According to Pearson correlation coefficient,the monthly correlation,seasonal correlation and annual correlation between land surface temperature and aerosol optical depth in Urumqi are at the level of 0.01,and the positive correlation is significant.The day and night correlation reached strong correlation,and the month of strong correlation was April.The correlation of daytime in spring is the highest in three years,and the correlation of night in autumn is greater than that of daytime.(4)The driving factors of AOD are analyzed by geographic detector.The influence degree of driving factors on AOD is terrain > population density > land surface temperature > GDP > land use.The impact of factor interaction on AOD is mutually reinforcing.GDP ? terrain has the greatest impact,followed by population density ? terrain,and terrain ? land use.Land use types have certain effects on land surface temperature and aerosol optical depth.The land surface temperature of cultivated land,unused land,urban and rural,industrial and mining and residential land is higher in daytime,followed by grassland,forest land and water area.At night,the land surface temperature of the water area is the lowest,again the unused land,forest land and grassland,and the temperature of urban and rural,industrial and mining and residential land is the highest.AOD is the highest in urban and rural land,grassland and unused water area,followed by urban and rural land,grassland and unused water area.Woodland,grassland and water area all contributed negatively to the increase of AOD and LST;Cultivated land,urban and rural areas,industrial and mining areas and residential land all contribute positively to the increase of AOD and LST;Unused land has a positive contribution to the increase of AOD and daytime LST,and a negative contribution to the increase of nighttime LST.