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Analysis of Variation Characteristics of Surface Ozone in Northern Suburb of Nanjing City, China in Summer TEXT SIZE: A A A

ZHAO Hui1, ZHENG Youfei1,2,3, XU Jingxin3, SUN Jian4, WU Jiamin1

(1. School of Environmental Science and Engineering, Nanjing University of Information Science&Technology, Nanjing 210044, China;
2. Jiangsu Provincial Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing 210044,China;
3. College of Atmospheric Physics and Environment, Nanjing University of Information Science&Technology, Nanjing 210044,China;
4. Shanghai Minhang District Meteorological Office, Shanghai 201100,China)

Abstract: In this paper, the daily variations of surface ozone concentration under different weather conditions were analyzed based on the observation data of surface ozone concentration in Northern Suburb of Nanjing City, China during the period from July 11, 2014 to September 10, 2014 and also the corresponding meteorological data, ozone concentration during the Youth Olympic Games period and other period were compared and analyzed. Moreover, the main factors affecting the variation of ozone concentration were discussed. Results show that① the daily mean value of ozone concentration was 75.55 μg/m3 during the observed period, and the daily mean value of ozone concentration was 66.47 μg/m3during the Youth Olympic Games period and that of other period was 79.74 μg/m3.With the Youth Olympic Games coming, concentrations of ozone show obvious declining trend;②daily variation curve of ozone concentration was unimodal, and the nocturnal variation was gentle but the diurnal one was significant; ③daily mean value of ozone concentrationswere102.23,63.66, and 63.86μg/m3on sunny, cloudy and rainy days,respectively. Under different weather conditions, daily ozone concentration varied the most significantly on sunny days, and gently on rainy and cloudy days; ④ daily mean value of ozone concentration frequency was mainly distributed within the range of 40-80μg/m3, accounting for 59.02% of total days. ⑤ variation of near surface ozone concentration could be affected by some meteorological factors, such as the relative humidity, wind speed, wind direction and sunshine duration, and the ozone concentration was positively correlated with temperature and sunshine duration and negatively correlated with the relative humidity.

Keywords: Nanjing, ozone, variation characteristics, actinochemistry, air pollution

EARTH AND ENVIRONMENT Vol. 44, No.2 Tot No.310, 2016, Page 161-168

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