【摘要】 臭氧是城市污染大气中的首要光化学污染物,其变化规律与前体物(NO、NO2和CO)和气象因素关系密切.利用2008年夏季天津城区地面大气O3、相关前体物和气象因素等观测数据,研究了O3浓度水平和时间变化规律,重点分析了7月3日—8月5日O3与NO、NO2和CO等前体物及气象因素(气温、相对湿度和风速)的相关性。结果表明,天津城区夏季O3存在一定的污染,超标时段多发生在13:00—19:00,这一时段对应高温、低湿、大风的天气条件;NO、NO2和CO作为O3的前体物,昼间其浓度与O3浓度呈线性负相关,夜间相互作用较为复杂,相关性显著降低;气象因素对O3浓度影响明显,高温、低湿利于光化学反应的进行,O3浓度与风速呈正相关表明可能有外来源的存在.更多还原

【Abstract】 Ozone(O3)is a primary gaseous contaminant in urban ambient, and its variation correlates well with its precursors (NO, NO2 and CO) and related meteorological factors. Based on the observational data of near surface O3, NO, NO2, CO and meteoro-logical factors in the urban area of Tianjin during summer 2008, the O3 concentrations and their temporal variation characteristics were studied. The correlation between O3 and its precursors (NO, NO2 and CO) and related meteorological factors (temperature, wind speed and relative humidity) was analyzed. The results show that O3 pollution during summer was serious in Tianjin, and the O3 concentrations were quite high from 13:00 to 19:00. O3 concentrations were well negatively correlated with NO, NO2, NOx and CO during day time, but correlation of night time is discreased because of complex variation of precursors. As to the meteorological fac-tors, O3 high concentrations correlated well with the high temperatures, high wind speed and low relative humidity.更多还原