摘要
根据广州城市大气中OH自由基和其它污染物同步测量结果 ,计算了城市大气HOx(OH +HO2 )化学过程中主要反应的转化速率 ,分析了城市大气化学过程的主要特征 ,并与清洁大气中的化学过程进行了对比 .研究结果表明 :广州城市大气中OH和HO2 总的生成速率分别约为 4 5× 1 0 8分子 / (cm3 ·s)和 3 8× 1 0 8分子 / (cm3 ·s) ,比清洁大气中要快得多 ;城市大气中的OH净生成主要来自气相HNO2 的光解 ,而OH的去除主要与VOCs、HCHO、NO2 和CO反应 。
Simultaneous measurements of atmospheric hydroxyl radicals (OH) and other pollutants in Guangzhou city were carried out in July, 2000. The quantitative analysis of HO x reaction cycle during daytime in summer was made. The calculation results indicated that the total production rates of OH and HO 2 were about 4 5×10 8 OH/(cm 3·s) and 3 8×10 8 HO 2/(cm 3·s), respectively. The primary OH source in urban atmosphere was the photolysis of HONO, while the main OH sinks were the reactions of OH with VOCs, HCHO, NO 2 and CO. The HO x chemistry in urban atmosphere is quite different from that in the remote clean atmosphere.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2004年第4期28-31,共4页
Environmental Science
基金
国家自然科学基金资助项目 ( 4 0 0 75 0 2 6
2 983 7190 )
关键词
大气OH自由基
测量
大气光化学
源和汇
广州
atmospheric hydroxyl radicals
measurement
atmospheric photochemistry
source and sink
Guangzhou City
