Present OH measurement limits and associated uncertainties

摘要: The first ion-assisted OH measurement instrument was developed and field tested in 1989. Since that time both technique have evolved substantially several potential interferences been investigated. Included among these are reactions could compete with the H2O/SO3 reaction, effect Of H2O on NO3− · HNO3/H2SO4 wall losses. These investigations also provided data of relevance to atmospheric ion neutral chemistry for two listed above, as well itself. Measurements made at Mauna Loa Observatory Hawaii show a diurnal variation tropospheric which spans more than 2 orders magnitude. Nighttime measurements revealed hydroxyl radicals 104 molecules cm−3 concentration range after dark.