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Details van artikel 9 van 106 gevonden artikelen
| Titel: |
A scaling analysis of ozone photochemistry |
| Auteur: |
B. Ainslie D. G. Steyn |
| Verschenen in: |
Atmospheric chemistry and physics |
| Paginering: | Jaargang 6 (2006) nr. 12 pagina's 4067-4077 |
| Jaar: |
2006 |
| Inhoud: |
A scaling analysis has been used to capture the integrated behaviour of several photochemical mechanisms for a wide range of precursor concentrations and a variety of environmental conditions. The Buckingham Pi method of dimensional analysis was used to express the relevant variables in terms of dimensionless groups. These grouping show maximum ozone, initial NO<sub>x</sub> and initial VOC concentrations are made non-dimensional by the average NO<sub>2</sub> photolysis rate (<i>j<sub>av</sub></i>) and the rate constant for the NO–O<sub>3</sub> titration reaction (<i>k</i><sub>NO</sub>); temperature by the NO–O<sub>3</sub> activation energy (<i>E</i><sub>NO</sub>) and Boltzmann constant (<i>k</i>) and total irradiation time by the cumulative <i>j<sub>av</sub></i>Δ<i>t</i> photolysis rate. The analysis shows dimensionless maximum ozone concentration can be described by a product of powers of dimensionless initial NO<sub>x</sub> concentration, dimensionless temperature, and a similarity curve directly dependent on the ratio of initial VOC to NO<sub>x</sub> concentration and implicitly dependent on the cumulative NO<sub>2</sub> photolysis rate. When Weibull transformed, the similarity relationship shows a scaling break with dimensionless model output clustering onto two straight line segments, parameterized using four variables: two describing the slopes of the line segments and two giving the location of their intersection. A fifth parameter is used to normalize the model output. The scaling analysis, similarity curve and parameterization appear to be independent of the details of the chemical mechanism, hold for a variety of VOC species and mixtures and a wide range of temperatures and actinic fluxes. |
| Uitgever: |
Copernicus GmbH (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 9 van 106 gevonden artikelen
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