南昌市酸雨特征与气象条件关系分析研究(英文)

Study on the Relationship between Acid Rain Characteristics and Weather Conditions in Nanchang

利用南昌市降水监测资料与高空气象探测资料,分析了南昌市酸雨污染的现状,揭示了南昌市酸雨的形成因素。研究表明,南昌市酸雨酸度大,频率高,且近年来降水pH值有下降趋势,主要是硫酸型污染,南昌市酸雨污染最严重的时段在秋、冬季。降雨pH值随着降雨等级的提高而增大,雨量的增大对降雨酸性有稀释作用。高空气象条件对酸雨有明显的影响,高空风风速小于7m/s时,酸雨频率较高,pH值也低,酸雨污染严重,反映了高空风对污染物水平输送同样具有稀释和冲淡的作用。逆温强度较强时,酸雨出现率增大。周边的工业区对南昌市酸雨的产生有明显作用。不稳定气象条件有利于大气低层污染的垂直和水平方向的扩散,可降低致酸污染物对区域的影响。

Based on the rainfall monitoring data and high altitude meteorological data,the present situation of acid rain pollution in Nanchang City was analyzed and the forming factors of acid rain were revealed. The results showed that acid rain in Nanchang had the characteristics of high acidity and frequency,and the pH value of rainfall reduced in recent years,belonging to sulfuric acid type,and the most serious acid rain pollution appeared in autumn and winter. The pH value of rainfall went up with the improvement of rainfall grade,and the increase of rainfall quantity had diluting effect on the rainfall acidity. High altitude meteorological conditions affected acid rain obviously,when the upper wind velocity was below 7 m/s,the frequency of acid rain was higher and its pH value was lower,with serious acid rain pollution,and it showed that upper wind had diluting effect on the horizontal transport of pollutants. The frequency of acid rain became higher with stronger inversion intensity. Moreover,the surrounding industrial areas had obvious effect on the formation of acid rain. Unstable meteorological conditions were beneficial to the horizontal and vertical diffusion of pollution in the lower atmosphere,reducing the effect of induced-acidity pollutants on a region.