Model calculations of night-time atmospheric OH

摘要: The distribution of OH in the troposphere at night was obtained with a time-dependent photochemical model. At night, major source is reaction between O 3 and night-time HO 2 . More than 16% produced by thermal dissociation NO sinks are same as during day-time. globally seasonally averaged concentration about 1.3 × 10 4 molecules/cm , which two orders magnitude smaller day-time concentration. Night-time concentrations appear to be most important winter middle latitudes, where 10% removal gases resulting from reactions occurs night. We also calculated over wide range climatic conditions, last ice age pre-industrial era, present. found that do not change much these transitions but may have decreased significantly ages times DOI: 10.1034/j.1600-0889.1992.t01-1-00003.x