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| Titel |
The POLARCAT Model Intercomparison Project (POLMIP): overview and evaluation with observations |
| VerfasserIn |
L. K. Emmons, S. R. Arnold, S. A. Monks, V. Huijnen, S. Tilmes, K. S. Law, J. L. Thomas, J.-C. Raut, I. Bouarar, S. Turquety, Y. Long, B. Duncan, S. Steenrod, S. Strode, J. Flemming, J. Mao, J. Langner, A. M. Thompson, D. Tarasick, E. C. Apel, D. R. Blake, R. C. Cohen, J. Dibb, G. S. Diskin, A. Fried, S. R. Hall, L. G. Huey, A. J. Weinheimer, A. Wisthaler, T. Mikoviny, J. Nowak, J. Peischl, J. M. Roberts, T. Ryerson, C. Warneke, D. Helmig |
| 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 ; 15, no. 12 ; Nr. 15, no. 12 (2015-06-17), S.6721-6744 |
| Datensatznummer |
250119836
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| Publikation (Nr.) |
 copernicus.org/acp-15-6721-2015.pdf |
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| Zusammenfassung |
| A model intercomparison activity was inspired by the large suite of
observations of atmospheric composition made during the International Polar
Year (2008) in the Arctic. Nine global and two regional chemical transport
models participated in this intercomparison and performed simulations
for 2008 using a common emissions inventory to assess the differences in
model chemistry and transport schemes. This paper summarizes the models and
compares their simulations of ozone and its precursors and presents an
evaluation of the simulations using a variety of surface, balloon, aircraft
and satellite observations. Each type of measurement has some limitations in
spatial or temporal coverage or in composition, but together they assist in
quantifying the limitations of the models in the Arctic and surrounding
regions. Despite using the same emissions, large differences are seen among
the models. The cloud fields and photolysis rates are shown to vary greatly
among the models, indicating one source of the differences in the simulated
chemical species. The largest differences among models, and between models
and observations, are in NOy partitioning (PAN vs. HNO3) and in
oxygenated volatile organic compounds (VOCs) such as acetaldehyde and
acetone. Comparisons to surface site measurements of ethane and propane
indicate that the emissions of these species are significantly
underestimated. Satellite observations of NO2 from the OMI (Ozone Monitoring Instrument) have been used to
evaluate the models over source regions, indicating anthropogenic emissions
are underestimated in East Asia, but fire emissions are generally
overestimated. The emission factors for wildfires in Canada are evaluated
using the correlations of VOCs to CO in the model output in comparison to
enhancement factors derived from aircraft observations, showing reasonable
agreement for methanol and acetaldehyde but underestimate ethanol, propane
and acetone, while overestimating ethane emission factors. |
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