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Impacts of using spectral nudging on regional climate model RCA4 simulations of the Arctic
SMHI, Research Department, Hydrology.
SMHI, Research Department, Climate research - Rossby Centre.
SMHI, Research Department, Climate research - Rossby Centre.ORCID iD: 0000-0003-2051-743X
2013 (English)In: Geoscientific Model Development, ISSN 1991-959X, E-ISSN 1991-9603, Vol. 6, no 3, 849-859 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2013. Vol. 6, no 3, 849-859 p.
National Category
Climate Research
Research subject
Climate
Identifiers
URN: urn:nbn:se:smhi:diva-407DOI: 10.5194/gmd-6-849-2013ISI: 000321137700013OAI: oai:DiVA.org:smhi-407DiVA: diva2:800005
Available from: 2015-04-01 Created: 2015-03-31 Last updated: 2017-12-04Bibliographically approved

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Berg, PeterDoescher, RalfKoenigk, Torben

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