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Home > Archive>Volume 12, Issue 6, 2020 >656-664. DOI:10.13878/j.cnki.jnuist.2020.06.002
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Correlation between surface PM2.5 and ozone during 2014-2019 in Beijing and Nanjing
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    Abstract:

    It is particularly important to clarify the correlation between fine particulate matter (PM2.5) and O3 (P-O) in account of the seemingly increasing surface ozone and decreasing PM2.5 trends in China since 2014.Therefore,observations of hourly PM2.5 and O3 data for Beijing and Nanjing during 2014 to 2019 were summarized to reveal their P-O correlations.The observations showed a decreasing trend of annual average PM2.5 mass concentration,which was -6.86 and -6.15 μg·m-3·a-1 for Beijing and Nanjing,respectively.While the annual maximum daily 8-hour average O3 (MDA8 O3) increased by 1.50 and 1.75 μg·m-3·a-1 for Beijing and Nanjing,respectively.O3 pollution became more serious in summer for both cities.For Beijing,when O3 mass concentration was below/above 100 μg·m-3,the increase of O3 concentration would correspond to the decrease/increase of PM2.5 concentration,indicating a negative/positive P-O correlation.The same varying P-O correlation existed for Nanjing,except for the different critical value of O3 mass concentration of 150 μg·m-3.Significantly positive P-O correlation,indicated by Pearson correlation coefficient (COR) being larger than 0.5 on daily time scale,was found in both Beijing and Nanjing during May to September.While significantly negative P-O correlation,indicated by COR value being smaller than -0.5 on hourly time scale,was found for both Beijing and Nanjing during November to February.Compared with Nanjing,monthly and seasonal P-O correlation varied more greatly for Beijing.As for the diurnal variation,there was a significantly positive P-O correlation at 16:00 in summer and a weakly positive correlation during 13:00-17:00 in spring and autumn,and a significantly negative correlation at 08:00 in spring,autumn and winter.

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SUN Jinjin, HUANG Lin, GONG Kangjia, WANG Xueying, LI Jingyi, QIN Momei, YU Xingna, HU Jianlin. Correlation between surface PM2.5 and ozone during 2014-2019 in Beijing and Nanjing[J]. Journal of Nanjing University of Information Science & Technology,2020,12(6):656-664

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  • Received:October 09,2020
  • Online: December 30,2020
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