Abstract:
Soil fugitive dust is a widespread source of particulate pollution in northern China. Due to its wide distribution, large quantity and difficulty in obtaining activity levels, a regional high-temporal resolution emission inventory is difficult to be systematically constructed, which is not conducive to the development of impact assessment and management and control strategies of soil dust sources. This study obtains high spatial resolution soil dust source activity levels through the interpretation of the 30 m resolution remote sensing image of the Landsat 8 satellite, and combines spatially differentiated soil texture and meteorological data to construct a high-spatial resolution soil fugitive dust emission inventory for each season in the Beijing-Tianjin-Hebei Region in 2017. The emission inventory combines the meteorological parameters, reasonably allocates the results of each season inventory month by month, and confirms the reliability of the results with the environmental receptor observation data. The results show that: (1) The proportion of soil dust emission area in the Beijing-Tianjin-Hebei Region is winter > spring > autumn > summer, which were 65%, 59%, 57% and 33%, respectively. In terms of the annual average state, Zhangjiakou and Chengde are relatively high, with 64% and 58%, Beijing and Tianjin were relatively low, with 42% and 43%, respectively, and the overall gap in the remaining cities is not obvious. (2) The PM
2.5, PM
10 and TSP emissions from the soil fugitive dust are 6.5×10
4, 31.0×10
4 and 103.4×10
4 t, respectively. (3) On the seasonal scale, the emission of soil dust is spring > winter > autumn > summer. On the urban scale, Xingtai, Handan, Zhangjiakou and Chengde City have higher annual emissions, while Langfang and Qinhuangdao City have lower annual emissions. The highest annual emissions per unit area occur in Zhangjiakou City and the western regions of Handan and Xingtai City. The results show that there is a significant difference in the spatial and temporal distribution of soil dust emissions in the Beijing-Tianjin-Hebei Region. The monthly distribution inventory can provide data support for the control of soil fugitive dust emissions in key months, and the high spatial resolution can also provide a basis for the differentiated management of key urban areas.