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- Title
Numerical Study of Cloud Effects on Tropospheric Ozone.
- Authors
Zhu, Bin; Xiao, Hui; Huang, Meiyuan; Li, Zihua
- Abstract
An elaborate cloud chemistry box model has developed in which gaseous-phase photochemistry is coupled with aqueous-phase chemistry to investigate the variation of ozone concentration and its distribution features above and below cloud, and in its upper and lower part, with results compared to observations. The cloud chemistry model is composed of three parts: gaseous-phase chemistry, aqueous-phase chemistry, and scavenging of soluble gases. The cloud influence on the ozone concentration can be separated into three portions: 1) the change of solar radiation flux by cloud which is responsible for decreasing or increasing of photochemical reaction in the troposphere and thus reducing or enhancing the concentration; 2) direct absorption of ozone and its precursors (NOx, NMHC, free radicals, etc.) by in-cloud liquid water; 3) aqueous-phase chemical reaction happening to species absorbed by cloud, responsible for the change in gaseous-phase ozone concentration. Numerical simulations show substantial difference in the importance regarding the effect of these factors on ozone between these levels and a close relation of cloud physical structure to the factors. The results agree well with the observations.
- Subjects
TROPOSPHERIC circulation; OZONE; AIR pollution; FREE radicals; CLOUDS; NUMERICAL analysis; ATMOSPHERIC chemistry
- Publication
Water, Air & Soil Pollution, 2001, Vol 129, Issue 1-4, p199
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1023/A:1010368229728