摘要
2008年大连市酸雨频率为36.9%,酸雨污染以硫酸型污染为主,但硝酸盐对酸雨的贡献相对较高,降水中对酸雨主要起中和作用的离子为钙离子及铵根离子。2003年-2008年来大连市降水酸度和酸雨频率呈逐年上升趋势,从各季节变化看,最高酸雨频率主要发生在夏季,降水中(Ca2++NH4+)/(SO4-2+NO3-)呈下降趋势,从而说明虽然大连市局地的二氧化硫和氮氧化物污染对降水酸度产生一定影响,但相比而言,空气中碱性颗粒物的减少,对大连市酸雨频率的升高影响更大;大连市酸雨污染受外来源的远距离输送影响的比例很大。
In 2008, frequency of acid rain in Dalian is up to 36. 9% with primary sulfuric acid pollution, but nitrate gives a relatively high contribution to acid rain by means of two ions - calcium ion and ammonium ion, both of which mainly play a key role in the neutralization to acid rain. From 2003 to 2008, the precipitation acidity and acid rain frequency in Dalian show an up- ward trend year by year. According to season change, the highest frequency of acid rain mostly arises in summer and （ Ca^2＋ ＋ NH4^＋ ）/（ SO4^-2 ＋ NO3^- ）in precipitation shows a downtrend, therefore, this indicates that the pollution of sulfur dioxide and oxynitilde in Dahan has some influence on precipitation acidity, however relatively speaking, reduction of alkaline particles in air has more influence to increase of acid rain frequency in Dahan; acid rain pollution in Dalian is mostly impacted by foreign source remote distance transmission.
出处
《环境科学与管理》
CAS
2010年第9期128-131,共4页
Environmental Science and Management
关键词
pH值酸雨频率
硫酸型
二氧化硫
氮氧化物
远距离输送
pH value
frequency of acid rain
sulphate
sulfur dioxide
oxynitfide
remote distance transmission
