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| Titel |
Impacts of using spectral nudging on regional climate model RCA4 simulations of the Arctic |
| VerfasserIn |
P. Berg, R. Döscher, T. Koenigk |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 6, no. 3 ; Nr. 6, no. 3 (2013-06-22), S.849-859 |
| Datensatznummer |
250017826
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| Publikation (Nr.) |
 copernicus.org/gmd-6-849-2013.pdf |
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| Zusammenfassung |
| The performance of the Rossby Centre regional climate model RCA4 is
investigated for the Arctic CORDEX (COordinated Regional climate Downscaling
EXperiment) region, with an emphasis on its suitability to be coupled to a
regional ocean and sea ice model. Large biases in mean sea level pressure
(MSLP) are identified, with pronounced too-high pressure centred over the
North Pole in summer of over 5 hPa, and too-low pressure in winter of a
similar magnitude. These lead to biases in the surface winds, which will
potentially lead to strong sea ice biases in a future coupled system. The
large-scale circulation is believed to be the major reason for the biases,
and an implementation of spectral nudging is applied to remedy the problems
by constraining the large-scale components of the driving fields within the
interior domain. It is found that the spectral nudging generally corrects for
the MSLP and wind biases, while not significantly affecting other variables,
such as surface radiative components, two-metre temperature and
precipitation. |
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