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| Titel |
Emission location dependent ozone depletion potentials for very short-lived halogenated species |
| VerfasserIn |
I. Pisso, P. H. Haynes, K. S. Law |
| 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 ; 10, no. 24 ; Nr. 10, no. 24 (2010-12-17), S.12025-12036 |
| Datensatznummer |
250008967
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| Publikation (Nr.) |
 copernicus.org/acp-10-12025-2010.pdf |
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| Zusammenfassung |
We present trajectory-based estimates of Ozone Depletion
Potentials (ODPs) for very short-lived halogenated source
gases as a function of surface emission location. The ODPs are
determined by the fraction of source gas and its degradation
products which reach the stratosphere, depending primarily on
tropospheric transport and chemistry, and the effect of the
resulting reactive halogen in the stratosphere, which is
determined by stratospheric transport and chemistry, in
particular by stratospheric residence time. Reflecting the
different timescales and physico-chemical processes in the
troposphere and stratosphere, the estimates are based on
calculation of separate ensembles of trajectories for the
troposphere and stratosphere. A methodology is described by
which information from the two ensembles can be combined to
give the ODPs.
The ODP estimates for a species with a fixed 20 d lifetime,
representing a compound like n-propyl bromide, are presented
as an example. The estimated ODPs show strong geographical and
seasonal variation, particularly within the tropics. The values
of the ODPs are sensitive to the inclusion of a convective
parametrization in the trajectory calculations, but the
relative spatial and seasonal variation is not. The results
imply that ODPs are largest for emissions from south and
south-east Asia during Northern Hemisphere summer and from the
western Pacific during Northern Hemisphere winter. Large ODPs
are also estimated for emissions throughout the tropics with
non-negligible values also extending into northern
mid-latitudes, particularly in the summer.
These first estimates, whilst made under some simplifying
assumptions, show larger ODPs for certain emission regions,
particularly south Asia in NH summer, than have typically been
reported by previous studies which used emissions distributed
evenly over land surfaces. |
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