Characterization of atmospheric circulation and transmission in Chongqing City during ozone polluted days
PU Xi1,2, LI Zhen-liang1,2, ZHANG Yue3, GAO Yang-hua3, LV Ping-jiang1, ZHANG Wei-dong1,2, ZHAI Chong-zhi1,2
1. Chongqing Institute of Eco-Environmental Science, Chongqing 401147, China; 2. Chongqing Key Laboratory of Urban Atmospheric Environment Observation and Pollution Control, Chongqing 401147, China; 3. Chongqing Institute of Meteorological Sciences, Chongqing 401147, China
Abstract：The pollution of tropospheric ozone has become an emerging issue in the urban areas of Chongqing. From 2015 to 2019, the near-surface ozone concentrations have elevated with increasing days of exceeding the national air quality standard (NAQS). The comprehensive analysis using meteorological data showed that high ozone concentration frequently appeared when the daily maximum temperature over 35℃ as well as relative humidity below 70%. T-mode principal component analysis (PCT) was applied to synoptic classification. The result demonstrated that the occurrence of ozone pollution in Chongqing was mostly related correlated to three typical weather patterns, such as patterns of the northwest to low (T1), low low-pressure rear type (T4) and west to high (T3), and the corresponding ratio of days of ozone exceeding the NAQS were 34.6%, 17.0%, and 14.2% respectively. The result of HYSPLIT4 indicated air masses during days of ozone exceeding NAQS were mainly short and moderate distance from the north, northeast, south, and west directions. It is worth mentioning that the south areas of urban Chongqing have become more and more important potential source regions of ozone from 2015 to 2019, according to the Potential Source Contribution Function (PSCF) distribution. In addition, PSCF results were highly consistent with the spatial distribution of NOx and VOCs emissions in Chongqing.
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