城市臭氧浓度分布特征

Ozone Concentration Distribution of Urban

近地面层臭氧 (O3 )研究是当今环境科学领域的前沿课题之一 ,随着汽车尾气排放NOx 和碳氢化合物的增加 ,在日光照射等条件下导致低层大气中O3 浓度明显增高 ,面临光化学烟雾污染的威胁 ,开展环境空气中O3 监测与分析对防治大气污染有十分重要的意义 .利用 2 0 0 3年 6个月的臭氧 (O3 )自动连续监测数据 ,对山东大学校园内O3 浓度的频率分布、日变化、月变化等特征进行分析 .实验结果表明 ,O3 小时平均浓度达到《环境空气质量标准》(GB30 95 1996 )二级标准的频率为 96 88% ;O3浓度呈明显的日变化 ,一般在下午浓度较高 ,上午和夜晚较低 ;O3 浓度的最高值出现在 6月份 ,这与辐射强烈 ,温度高有关 ;天气条件也影响O3 浓度 ,一般晴天时O3 浓度高 ,多云、阴雨天气O3

The increase of ozone concentration in urban is one of the most important research topics on environmental science. With the increase of nitrogen oxides and hydrogen-carbon compounds which are exhausted from cars, the ozone concentration in urban is obviously increased on sunlight, and threat of photochemistry smog will be possible. Therefore, it is very important to monitor and study the ozone concentration distribution in urban. The frequency-distribution, diurnal variation and monthly variation of ozone concentration were studied on the campus of Shandong University during six months monitoring. The influence of solar radiation and weather conditions on ozone concentration were discussed. The frequency of ozone concentration less than 200μg/m 3 is 96.88%. The ozone concentration has an obvious diurnal variation. The ozone concentration in the afternoon is higher than in the morning and in the evening. The maximum appears in June, when it is the strong solar radiation and high air-temperature. The weather conditions also influence the ozone concentration. The ozone concentration in clear day is higher than in rainy and cloudy day.