Temporal And Spatial Distribution Characteristics Of Atmospheric Aerosols And Their Responses To Land Use

As a key region for China’s economic development,the Beijing-Tianjin-Hebei region is also one of the most serious regions in terms of air pollution,and its air and environmental problems have always been of concern to the whole society.In order to solve the increasingly prominent air pollution problems,the Beijing-Tianjin-Hebei region has taken a series of governance measures and made certain improvements to the region’s air pollution problems.In order to maintain and improve the current air environment in the Beijing-Tianjin-Hebei region,real-time dynamic monitoring of aerosol concentrations,physical properties and optical characteristics has become a prerequisite for addressing air pollution problems.In recent years,the rapid land use/cover change in the Beijing-Tianjin-Hebei region has provided new sources of local aerosols,directly or indirectly influencing the various properties of aerosols.In order to explore the impact of land use on aerosols in the Beijing-Tianjin-Hebei region,this paper analyzes the temporal and spatial changes of aerosols and the influencing factors and their response to aerosols from2000 to 2018 in the Beijing-Tianjin-Hebei region based on remote sensing and geographic information technology,and draws the following results and conclusions.（1）The spatial distribution of Aerosol Optical Depth（AOD）in the Beijing-Tianjin-Hebei region is higher in the south and lower in the north,and has obvious seasonal differences.Generally,summer>autumn>spring>winter;the Angstr（?）m index in spring and winter is smaller.Most are coarse-particle aerosols,which may be affected by wind and sand.（2）By comparing a variety of internal and external influencing factors,it is found that the contribution of internal factors PM_2.5 and PM₁₀ to aerosols is higher than that of gaseous pollutants SO₂ and NO₂,and the external factor temperature is the main factor affecting the change of aerosol concentration.（3）Land use changes have a significant impact on aerosols,among which cultivated land and urban-residential land are the main types of land that affect aerosols;and by analyzing the correlation between the Vegetation Index（NDVI）and the Building Index（NDBI）and AOD,It is found that NDVI is significantly negatively correlated with aerosols,vegetation coverage has an inhibitory effect on aerosols,and the inhibitory effect of high vegetation coverage on aerosols is better than that of low-value covered areas;while NDBI has a positive correlation with aerosols,urbanization The process has a promoting effect on aerosols,mainly due to the emission of building activities driven by the urbanization process to provide a source of aerosols.The study concludes that the Beijing-Tianjin-Hebei region should combine landscape heterogeneity and industrial space agglomeration with high vegetation cover to maximize the reduction of aerosols by vegetation greenness,and seize key seasons to effectively control air pollution according to local and seasonal conditions.Figure 29;Table 14;Reference 92...