LIU Sisi1,2, YUAN Jinguo1,2
（1. College of Resources and Environmental Sciences, Hebei Normal University, Shijiazhuang 050024;
2. Laboratory of Environmental Evolution and Ecological Construction in Hebei Province, Shijiazhuang 050024）
Abstract: Using OMI satellite remote sensing data, the temporal-spatial variation of tropospheric NO2 vertical column density in Beijing-Tianjin-Hebei air pollution transmission path cities from 2006 to 2017 was analyzed. Results showed that, by linear fitting, the OMI inversed NO2 vertical column density was significantly positively correlated with the ground measured NO2 density. The monthly mean values of NO2 column density in Beijing-Tianjin-Hebei air pollution transmission path cities presented a periodic change, the highest and lowest values occurred in January and July, respectively. The seasonal changes of the NO2 column density were quite obvious, highest in winter, followed by in autumn and spring, and lowest in summer. In terms of the annual variation, the NO2 column density increased in the period of from 2006 to 2010, unchanged approximately in the period of from 2011 to 2013, and began to decline rapidly after 2014. The spatial distribution of the NO2 vertical column density showed the pattern of low in the northwest and high in the middle and the east. The seasonal variation of the spatial distribution of the NO2 vertical column density was same to its annual variation in the 12 years.
Key words: OMI; tropospheric NO2 column density; spatial and temporal variation; Beijing-Tianjin-Hebei air pollution transmission path cities
EARTH AND ENVIRONMENT Vol.48, No.2, Tot No.334, 2020, Page 171-180
