Physics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.7325h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, April 20, 1991, p. 7325-7362. Research supported by Department of the
Physics
82
Atmospheric Chemistry, Atmospheric Composition, Photochemical Reactions, Troposphere, Two Dimensional Models, Air Pollution, Hydroxyl Radicals, Nitrogen Oxides, Ozone, Pollution Transport, Trace Elements
Scientific paper
A latitudinally averaged two-dimensional model has been used to study the distributions, budgets, and trends of trace gases in the atmosphere from pole and from the surface to 24 km. The chemical mechanism used contains 56 chemical species, including 12 hydrocarbons and 125 chemical and photochemical reactions, as well as wet removal processes and dry deposition. Apart from the stratospheric sources of ozone and nitrogen oxides, the model chemistry is driven completely by the time-dependent photolytic processes and the emission of 17 chemical species distributed according to ten different source categories. Each source category is parameterized as a function of latitude and time of the year. The model results are generally in good agreement with observations, and the model reproduces the observed temporal and spatial variation in the mixing ratios of methane, carbon monoxide, hydrocarbons, and ozone. The global average concentration of the hydroxyl radical in the troposphere is 830,000 molecules/cu cm, in agreement with recent calculations based on budgets and trends for CH3CCl3. Model budgets for NO(x), CO, CH4, H2 and O3 are presented.
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