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| Titel |
Impacts of using spectral nudging on regional climate model RCA4 simulations of the Arctic |
| VerfasserIn |
Peter Berg, Ralf Döscher, Torben Koenigk |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250079572
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| Zusammenfassung |
| The performance of the Rossby Centre regional climate model RCA4 is investigated for the
Arctic CORDEX 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 5Â 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 the 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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