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| Titel |
Comparison of the CMAM30 data set with ACE-FTS and OSIRIS: polar regions |
| VerfasserIn |
D. Pendlebury, D. Plummer, J. Scinocca, P. Sheese, K. Strong, K. Walker, D. Degenstein |
| 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. 21 ; Nr. 15, no. 21 (2015-11-10), S.12465-12485 |
| Datensatznummer |
250120152
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| Publikation (Nr.) |
 copernicus.org/acp-15-12465-2015.pdf |
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| Zusammenfassung |
| CMAM30 is a 30-year data set extending from 1979 to 2010
that is generated using a version of the Canadian Middle Atmosphere Model
(CMAM) in which the winds and temperatures are relaxed to the Interim
Reanalysis product from the European Centre for Medium-Range Weather
Forecasts (ERA-Interim). The data set has dynamical fields that are very
close to the reanalysis below 1 hPa and chemical tracers that are
self-consistent with respect to the model winds and temperature. The chemical
tracers are expected to be close to actual observations. The data set is here
compared to two satellite records – the Atmospheric Chemistry Experiment
Fourier transform spectrometer and the Odin Optical Spectrograph and Infrared
Imaging System – for the purpose of validating the temperature, ozone, water
vapour and methane fields. Data from the Aura microwave limb sounder are also
used for validation of the chemical processing in the polar vortex. It is
found that the CMAM30 temperature is warmer by up to 5 K in the
stratosphere, with a low bias in the mesosphere of ~ 5–15 K. Ozone is
reasonable (±15 %), except near the tropopause globally and in the
Southern Hemisphere winter polar vortex. Water vapour is consistently low by
10–20 %, with corresponding high methane of 10–20 %, except in the
Southern Hemisphere polar vortex. Discrepancies in this region are shown to
stem from the treatment of polar stratospheric cloud formation in the model. |
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