Photochemistry ozone

Peyton G R, Glaze W H (1987) Mechanism of Photolytic Ozonation - Photochemistry of Environmental Aquatic Systems, R G Zirka and W J Cooper, American Chemical Society Symposium-Series, 327 76-88, Washington DC. 

This approach excludes the instability of using estimates. Nevertheless, there have been many successful attempts at modeling ozone photochemistry. A number of Lagrange-type models are efficient and some take into account up to 75 chemical elements and compounds. The 3-D model MOZART (Model for OZone And Related chemical Tracers) is also efficient (Kondratyev and Varotsos, 2000). 

I he more detailed calculations including eddy diffusion (vertical mixing by uirbulence), NO distributions, and ozone photochemistry indicate the possible reduction of ozone concentration by 2 to 60%, depending on the assumed rates of NO emissions at 20 km from SST fleets. The ozone recovery time is 10 to 15 years after the SST fleets are stopped. 

Nitrogen dioxide Nitrate Nitrite Ozone Photochemistry Quantum yield Rate law... 

Another feature of interest is related to the quantum yields of hydrogen peroxide and of ozone photochemistry as is outlined in Fig. 6-12. Theoretically, the photolysis of 1 mol of H2O2 should produce 2 mol of hydroxyl radicals with a calculated maximum quantum yield of two, according to the definition of presented in Tab. 3-7 = However, the experimental situation is much... 

Photolysis of ozone in wet air is a source of free hydroxyl radicals according to Eqs. 6-13 and 6-14. The yield and wavelength dependencies of these reactions are the most important aspect of ozone photochemistry in the troposphere (Finlay-son-Pitts and Pitts, 1986). 

The central concepts of ozone photochemistry are the split into NOjc-sensitive and NO -saturated photochemical production regimes, the role of the OH radical, and the concept of ozone production efficiency per NOj. ... 

Based on existing model capabilities and field measurements, it should be possible to evaluate and modify current models for ozone photochemistry with the following goals ... 

Carpenter LJ, Monks PS, Bandy BJ, Penkett SA, Galbally IE, Meyer CP. A study of peroxy radicals and ozone photochemistry at coastal sites in the Northern and Southern Hemispheres. J Geophys Res 1997 102 25417-27. 

Salisbury G, Monks PS, Bauguitte S, Bandy BJ, Penkett SA. A seasonal comparison of the ozone photochemistry in clean and polluted air masses at Mace Head Ireland. J Atom Chem 2002 41 163-87. 

The goal of this section is not to address the Sun s influence on surface climate, but rather to consider its role in variability of ozone in the mesosphere and stratosphere, again with a view towards this perturbation as a test of some components of ozone photochemistry. 

Schiff, H. I. (1972). Laboratory measurements of reactions related to ozone photochemistry. Ann. Geophys. 28, 67-77. 

Recently, the first observations have been made of a spin-forbidden channel 03 + hv - 0( D2) + 02(3T ) at photolysis wavelengths of 317-327 nm using Doppler profiles of VUV LIF spectra of the 0(lD2) fragment [117], This result may have very important implications for tropospheric chemistry, since new channels for the production of O( D) potentially mean new source terms for OH. Ozone photochemistry clearly shows the fascinating complexity possible even for a triatomic molecule, the dynamics of which are only slowly being revealed by application of the newest correlation methods. 

There is a distinct possibility that nitrogen oxides are of great importance in ozone photochemistry. In the first place we urgently need observations on their concentrations in the stratosphere. Investigations about the photodissociation products of N2O and its origin (see Bates/Hays 1967) should be continued and extended in order to establish if N2O is an important source for odd nitrogen in the upper atmosphere. If, however, most of the stratospheric NO and NO2 is produced at very high levels by other processes some solar cycle influence on the ozone layer will be possible. 

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