WANG Yanli1, DOU Xiaoyan2, ZHAO Xudong2, YANG Wen1, BAI Zhipeng1
（1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
2. Qinghai Environmental Monitoring Center, Xining 810007, China）
Abstract: Concentrations of O3 had been monitored by O3 analyzer M400EU, at national background station in Menyuan area, Qinghai Province, China, during the period from Sep. 13th 2013 to Oct. 14th 2013. Observation results show that the hourly average concentration of O3 is 115.0±22.6μg/m3, lower than the limiting value (160ug/m3) and 1-hour average O3 concentration is taken as grade 1, based on Ambient Air Quality Standards (GB3095-2012). The synchronism of NOx and O3 concentration was checked detailedly. Most of the time, analysis result showed negative synchronism, which means decreasing NOx with increasing O3 concentrations, revealing that concentration of O3 is controlled by photochemical reaction with NOx as gas precursor. While during the rest of the sampling period, positive synchronism of NOx and O3 were found, waving with ups and downs together, indicating that the atmospheric transmission process is responsible for accumulation of O3. Meanwhile, multiple linear regression analysis of O3 and environmental parameters show that the equation of linear regression is Y=0.630T-0.192H-0.004P-0.091W+196.039 (temperature (T), relative humidity (H), atmospheric pressure (P) and wind speed (W)). Based on analysis above, concentration of O3 is controlled by both photochemical reaction and atmospheric transmission process, while low NOx concentration combined with high temperature, low humidity and high wind speed, might promote the accumulation of O3.
Key words: Menyuan; O3; photochemical reaction; environmental parameter
EARTH AND ENVIRONMENT Vol.44, No.4 Tot No.312, 2016, Page 431-436
