Temporal and Spatial Variation of Aerosol Optical Depth and Analysis of Influencing Factors in Beijing-Tianjin-Hebei Region from 2010 to 2016

JING Yue; SUN Yanling; FU Hongchen; MA Han; TENG Qingyi; CUI Yueming

doi:10.19672/j.cnki.1003-6504.2018.08.016

Abstract：The temporal and spatial evolution characteristics of AOD (aerosol optical depth) in the Beijing-Tianjin-Hebei region during the period 2010-2016 were analyzed using AOD data from the MOD04_3k products, and the correlation analysis was conducted with respect to the influencing factors of regional scale and pixel scale with eight influencing factors. The results of the analysis showed that AOD values of the Beijing-Tianjin-Hebei region were characterized with that higher in the south and lower in the north with a notable belt of AOD values stretching from southwest to northeast, and in the seven-year period AOD values increased first and then decreased, of which AOD value reached the highest in summer and then declined, the second high AOD value was found in the period of spring and autumn, while the AOD value was the lowest in winter but then increasing. As to the spatial evolution trend of AOD value, most of the areas in the study region showed a growing tendency, particularly in the cities (Tangshan, Beijing, Baoding and Shijiazhuang) and the surrounding areas, and the mountain area in the northwest part remained stable but merely the scattered areas in the southeastern part showed a decreasing tendency. Evidently, the spatial evolution of AOD was different in seasons; and with the Beijing-Tianjin-Hebei as a whole, the contribution of artificial factors was the greatest, followed by meteorological factors and the factors of earth's surface. The main factor causing the increment of AOD value was the air temperature for cities of Beijing and Langfang, while the main factor was the relative humidity for Qinhuangdao City, and the second industry of total output value for other 10 cities. As to the pixel scale, the spatial differentiation of the influencing factors led to spatial differences in AOD.