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| Titel |
A scaling analysis of ozone photochemistry |
| VerfasserIn |
B. Ainslie, D. G. Steyn |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 12 ; Nr. 6, no. 12 (2006-09-11), S.4067-4077 |
| Datensatznummer |
250004106
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| Publikation (Nr.) |
 copernicus.org/acp-6-4067-2006.pdf |
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| Zusammenfassung |
| 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 NOx and initial VOC concentrations are made non-dimensional
by the average NO2 photolysis rate (jav) and the rate
constant for the NO–O3 titration reaction (kNO);
temperature by the NO–O3 activation energy (ENO)
and Boltzmann constant (k) and total irradiation time by the cumulative
javΔt photolysis rate. The analysis shows
dimensionless maximum ozone concentration can be described by a
product of powers of dimensionless initial NOx concentration,
dimensionless temperature, and a similarity curve
directly dependent on the ratio of initial VOC to NOx concentration
and implicitly dependent on the cumulative NO2 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. |
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