【摘要】 利用2004～2006年杭州主城区环境空气监测资料,研究了O₃、NO₂和CO浓度的分布特征和时间变化规律,结果表明,杭州主城区3年的O₃、NO₂、CO的年均浓度都不大,分别为40、60、1400μg·m^-3。四季中O₃、NO₂和CO浓度相差较大,O₃是夏季高冬季低,NO₂和CO则是秋季较高,夏季较低。O₃、NO₂和CO浓度日变化也很明显,其中O₃是单峰形态,NO₂和CO为双峰形态。不同天气条件下O₃与烃类的关系研究表明,晴天时烃类浓度减少,O₃浓度明显增加;阴天时O₃浓度较低,烃类浓度较高,它们的变化不大。白天和夜晚不同风速时O₃、C₂-C₁₂的浓度变化不同,白天风速增大时C₂-C₁₂浓度减小,O₃浓度增加;晚上无此变化。更多还原

【Abstract】 Based on the air monitoring data in Hangzhou urban areas from 2004 to 2006,the concentrations of O₃, NO₂,CO,and their temporal variation characteristics were analyzed.The results showed that all the annual mean concentrations of O₃,NO₂,and CO were low in the three years,which were 40,60,and 1400μg·m^-3,respectively. The concentrations of O₃,NO₂,and CO were different among seasons,O₃ concentration was the highest in summer and the lowest in winter,while both NO₂ and CO concentrations were higher in winter and lower in summer. The diurnal variations of the concentrations of O₃,NO₂,and CO were obvious,the diurnal variations of O₃ concentrations showed one peak,while the others had two peaks.The relationship between O₃ and hydrocarbons concentration in different weather conditions showed that O₃ concentration increased significantly and hydrocarbons reduced during cloudless days,but during cloudy days O₃ concentration was lower and hydrocarbons concentrations were higher,and their concentrations changed little.In the daytime and nighttime,O₃ and C₂- C₁₂ hydrocarbons concentrations changed with different wind velocity.In the daytime,the C₂- C₁₂ hydrocarbons concentrations reduced with the increase of wind speed,and O₃ was exactly opposite.The similar situation was not found in the nighttime.更多还原