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| Titel |
Protocol for the development of the Master Chemical Mechanism, MCM v3 (Part A): tropospheric degradation of non-aromatic volatile organic compounds |
| VerfasserIn |
S. M. Saunders, M. E. Jenkin, R. G. Derwent, M. J. Pilling |
| 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 ; 3, no. 1 ; Nr. 3, no. 1 (2003-02-12), S.161-180 |
| Datensatznummer |
250000717
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| Publikation (Nr.) |
 copernicus.org/acp-3-161-2003.pdf |
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| Zusammenfassung |
| Kinetic and mechanistic data relevant to the tropospheric degradation of volatile organic
compounds (VOC), and the production of secondary pollutants, have previously been used to
define a protocol which underpinned the construction of a near-explicit Master Chemical
Mechanism. In this paper, an update to the previous protocol is presented, which has been used
to define degradation schemes for 107 non-aromatic VOC as part of version 3 of the Master
Chemical Mechanism (MCM v3). The treatment of 18 aromatic VOC is described in a
companion paper. The protocol is divided into a series of subsections describing initiation
reactions, the reactions of the radical intermediates and the further degradation of first and
subsequent generation products. Emphasis is placed on updating the previous information, and
outlining the methodology which is specifically applicable to VOC not considered previously
(e.g. a- and
b-pinene). The present protocol aims to take into consideration work available in
the open literature up to the beginning of 2001, and some other studies known by the authors
which were under review at the time. Application of MCM v3 in appropriate box models
indicates that the representation of isoprene degradation provides a good description of the
speciated distribution of oxygenated organic products observed in reported field studies where
isoprene was the dominant emitted hydrocarbon, and that the a-pinene degradation chemistry
provides a good description of the time dependence of key gas phase species in
a-pinene/NOX
photo-oxidation experiments carried out in the European Photoreactor (EUPHORE).
Photochemical Ozone Creation Potentials (POCP) have been calculated for the 106 non-aromatic
non-methane VOC in MCM v3 for idealised conditions appropriate to north-west
Europe, using a photochemical trajectory model. The POCP values provide a measure of the
relative ozone forming abilities of the VOC. Where applicable, the values are compared with
those calculated with previous versions of the MCM. |
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