摘要
本文报道1987年7月在四川省北部广元地区降水化学事件研究的结果,当一场大雨由北向南推进时,在广元地区观测到硫酸型酸雨。从降水化学特征推论:外地输送来的SO_2在云中和H_2O_2反应生成硫酸降落到该地区,在广元市区云下降雨洗脱SO_2使降雨进一步酸化,在郊区云下洗脱NH_8和颗粒物部分中和了降雨的酸度,然而,这次降雨事件中无论是酸沉降或是硫沉降主要来自降雨云。
A case study of precipitation chemistry of July 1987 is presented in Gu-angyuan area of northern Sichuan Province. The sulfuric acid type acid rain was observed when a heavy precipitation event from north to south passed through this area. From the precipitation chemistry it was demonstrated that the sulfuric acid was mainly formed in cloud by the reaction of H2O2 and SO2 which was transported from other areas. The precipitation was further acidified by below-cloud scavenging of SO2 in Guangyuan City. Some rain water samples were partly neutralized by below-cloud scavenging of NHg and parti-culates at the suburb. However, most of the acid deposition or sulfur deposition was from precipitating cloud in this event.
出处
《环境化学》
CAS
CSCD
北大核心
1991年第1期26-32,共7页
Environmental Chemistry
