OVERVIEW: TROPOSPHERIC OZONE, SMOG AND OZONE-NO -VOC SENSITIVITY
1 3 Chemistry of ozone and cause of the NOx-VOC split ===== 1 1 What is ozone? Ozone (O3) is the primary ingredient of photochemical smog, the type of air pollution that is associated with sunlight-driven chemical reactions Ozone is associated in particular with the type of air pollution events that
Tropospheric ozone and nitrogen oxides
Change in tropospheric ozone since pre-industrial era •O 3 is reactive: no ice core record • Surface measurements in 19 thand early 20 century in Europe: much lower O 3 (10-20 ppbv) than today (40-50 ppbv), and different seasonal cycle But relationship to Northern Hemisphere concentrations not obvious • Global chemical transport models
Enhanced Mid-Latitude Tropospheric Column Ozone over East
sphere, with tropospheric ozone accounting for only about 10 of the whole amount Despite its relatively small quantity, however, tropospheric ozone is the pri-mary precursor for hydroxyl (OH) radicals, which con-trol the lifetimes of many gas species in the tropo-sphere Recently, chemical transport modeling studies
Tropospheric oxidation ozone FinalSpring2013
Ozone chemical loss is driven by photolysis frequency J(O3 O(1D)) at 300-320 nm: 0 J qId() ()() dJ/d , 10-6 s-1 nm-1 Closing the tropospheric ozone budget requires a tropospheric chemical source >> FO3 From Jacob 14
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