气象因子对近地面层臭氧浓度的影响

Influences of the meteorological factorson the ozone concentration near the ground

利用近几年来近地面层臭氧浓度和常规气象要素的观测资料,分析了温度、降水、蒸发、风向风速等气象要素对近地面层臭氧浓度的影响.结果表明,近地面层臭氧浓度随着气温的升高而升高,臭氧浓度的日变化和季节变化有同样趋势;而降水、湿度的影响刚好与气温相反;大风或有雾的天气条件也会成为近地面层臭氧浓度增高的因素,这可能与大风对引起近地面臭氧产生的前体物的搬运作用以及雾内湍流将高层臭氧向下的输送作用有关.

<Abstrcat> With the data of ozone concentration near the ground and general meteorological factors observed in recent years from Jianghan Plain, Centre China, the effects of some meteorological factors, such as temperature, rainfall, wind and fog, etc., on the change of ozone concentration are analyzed in the paper. From the results, there are significant positive relationship between ozone concentration and air temperature, but the effects of rainfall and moisture are different. On the other hand, gale or fog is also the factor to increase the ozone concentration near the ground mainly because the gale can transit the contamination which may give birth to the ozone near the ground or the evolution of turbulence in the fog may transfer the ozone of a higher layer towards the ground.