Impacts of using spectral nudging on regional climate model RCA4 simulations of the Arctic
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)...
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Copernicus Publications
2013-06-01
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Series: | Geoscientific Model Development |
Online Access: | http://www.geosci-model-dev.net/6/849/2013/gmd-6-849-2013.pdf |
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doaj-9dcb6c61547641f482e6ce82baea20032020-11-24T22:52:53ZengCopernicus PublicationsGeoscientific Model Development1991-959X1991-96032013-06-016384985910.5194/gmd-6-849-2013Impacts of using spectral nudging on regional climate model RCA4 simulations of the ArcticP. BergR. DöscherT. KoenigkThe 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.http://www.geosci-model-dev.net/6/849/2013/gmd-6-849-2013.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
P. Berg R. Döscher T. Koenigk |
spellingShingle |
P. Berg R. Döscher T. Koenigk Impacts of using spectral nudging on regional climate model RCA4 simulations of the Arctic Geoscientific Model Development |
author_facet |
P. Berg R. Döscher T. Koenigk |
author_sort |
P. Berg |
title |
Impacts of using spectral nudging on regional climate model RCA4 simulations of the Arctic |
title_short |
Impacts of using spectral nudging on regional climate model RCA4 simulations of the Arctic |
title_full |
Impacts of using spectral nudging on regional climate model RCA4 simulations of the Arctic |
title_fullStr |
Impacts of using spectral nudging on regional climate model RCA4 simulations of the Arctic |
title_full_unstemmed |
Impacts of using spectral nudging on regional climate model RCA4 simulations of the Arctic |
title_sort |
impacts of using spectral nudging on regional climate model rca4 simulations of the arctic |
publisher |
Copernicus Publications |
series |
Geoscientific Model Development |
issn |
1991-959X 1991-9603 |
publishDate |
2013-06-01 |
description |
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. |
url |
http://www.geosci-model-dev.net/6/849/2013/gmd-6-849-2013.pdf |
work_keys_str_mv |
AT pberg impactsofusingspectralnudgingonregionalclimatemodelrca4simulationsofthearctic AT rdoscher impactsofusingspectralnudgingonregionalclimatemodelrca4simulationsofthearctic AT tkoenigk impactsofusingspectralnudgingonregionalclimatemodelrca4simulationsofthearctic |
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1725664145960861696 |