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| Titel |
Inclusion of mountain-wave-induced cooling for the formation of PSCs over the Antarctic Peninsula in a chemistry–climate model |
| VerfasserIn |
A. Orr, J. S. Hosking, L. Hoffmann, J. Keeble, S. M. Dean, H. K. Roscoe, N. L. Abraham, S. Vosper, P. Braesicke |
| 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. 2 ; Nr. 15, no. 2 (2015-01-30), S.1071-1086 |
| Datensatznummer |
250119354
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| Publikation (Nr.) |
 copernicus.org/acp-15-1071-2015.pdf |
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| Zusammenfassung |
| An important source of polar stratospheric clouds (PSCs), which play a
crucial role in controlling polar stratospheric ozone depletion, is from the
temperature fluctuations induced by mountain waves. However, this formation
mechanism is usually missing in chemistry–climate models because these
temperature fluctuations are neither resolved nor parameterised. Here, we
investigate the representation of stratospheric mountain-wave-induced
temperature fluctuations by the UK Met Office Unified Model (UM) at climate
scale and mesoscale against Atmospheric Infrared Sounder satellite
observations for three case studies over the Antarctic Peninsula. At a high
horizontal resolution (4 km) the regional mesoscale configuration of the UM
correctly simulates the magnitude, timing, and location of the measured
temperature fluctuations. By comparison, at a low horizontal resolution
(2.5° × 3.75°) the global climate
configuration fails to resolve such disturbances. However, it is
demonstrated that the temperature fluctuations computed by a mountain wave
parameterisation scheme inserted into the climate configuration (which
computes the temperature fluctuations due to unresolved mountain waves) are
in relatively good agreement with the mesoscale configuration responses for
two of the three case studies. The parameterisation was used to include the
simulation of mountain-wave-induced PSCs in the global chemistry–climate
configuration of the UM. A subsequent sensitivity study demonstrated that
regional PSCs increased by up to 50% during July over the Antarctic
Peninsula following the inclusion of the local mountain-wave-induced cooling
phase. |
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