福建茫荡山地区春季大气O3、HONO、HCHO、H2O2对 ·OH的贡献率研究

2009年春季在福建南平市茫荡山地区进行观测,测量了.OH源O3、HONO、HCHO和H2O2的浓度.结果表明O3、HCHO、HONO、H2O2浓度分别为4.96×10-8、3.97×10-10、2.53×10-10、1.18×10-10,低于华北农村的浓度.利用CMAQ计算O3、HCHO、HONO、H2O2对.OH的贡献率,分别为57.0%、7.7%、34.9%、0.4%.O3光解是该地区最重要的.OH来源.O3、HCHO、H2O2对.OH的贡献呈现单峰变化,在12:00～13:00达到峰值.HONO对.OH的贡献曲线呈波动状,和人类居住环境清晨出现峰值的情况不同.

Study on Contribution Factor to Atmospheric ·OH by O3, HONO, HCHO and H2O2 in Spring at Mangdang Mountain, Fujian Province

The observation was conducted in Mangdang Mountain, Nanping, Fujian Province in the spring of 2009. Ozone_, HONO, HCHO and H₂O₂ which are regarded as the sources of ·OH and other atmospheric components were measured. Mixing ratios of O₃, HCHO, HONO and H₂O₂ were determined to be 4.96×10^-8, 3.97×10^-10, 2.53×10^-10 and 1.18×10^-10 respectively, which were lower than the previous observation at the rural areas in Northern China. Using CMAQ, the contribution factors to the ·OH of O₃, HCHO, HONO, and H₂O₂ were calculated to be 57.0%, 7.7%, 34.9% and 0.4% respectively. The photolysis of O₃ was the most important source of OH radicals in the atmosphere. The contribution factors of O₃, HCHO, and H₂O₂ had a single peak during 12:00-13:00 local time. For HONO, the contribution factor showed fluctuations during the daytime, unlike the human living environment in which it peaked in the morning.