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Impact of surface waves in a regional climate model
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (Meteorology)
The Norwegian Meteorological Institute. (Oceanography)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (Meteorology)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (Meteorology)
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2010 (English)In: Meteorologische Zeitschrift, ISSN 0941-2948, E-ISSN 1610-1227, Vol. 19, no 3, 247-257 p.Article in journal (Refereed) Published
Abstract [en]

A coupled regional atmosphere-wave model system is developed with the purpose of investigating the impactof climate changes on the wave field, as well as feed-back effects of the wave field on the atmosphericparameters. This study focuses on the effects of introducing a two-way atmosphere-wave coupling on theatmosphere as well as on wave parameters. The model components are the regional climate model RCA, andthe third generation wave modelWAM. Two different methods are used for the coupling, using the roughnesslength and only including the effect of growing sea, and using the wave age and introducing the reductionof roughness due to decaying sea (swell). Introducing a two-way coupling results in an altered frequencydistribution of wind speed and wave heights. When only including growing sea the impact of waves on thelong term mean atmospheric parameters is limited, inducing a reduction of wind speed and significant waveheight. When also the impact of swell is introduced, there is a shift towards higher wind speeds as well ashigher significant wave heights in the four investigated areas. There is a reduction of surface heat fluxesand a decrease in near surface temperature as well as a significant increase in near surface humidity. Themajor conclusion is that when introducing a more realistic surface description over sea, the air-sea interactionrepresented by waves has a significant impact also on long term averages of parameters in the atmosphere.Waves should thus be introduced in climate models for a realistic description of processes over sea.

Place, publisher, year, edition, pages
2010. Vol. 19, no 3, 247-257 p.
National Category
Meteorology and Atmospheric Sciences
Identifiers
URN: urn:nbn:se:uu:diva-130648DOI: 10.1127/0941-2948/2010/0456ISI: 000281127700004OAI: oai:DiVA.org:uu-130648DiVA: diva2:350111
Available from: 2010-09-10 Created: 2010-09-10 Last updated: 2017-12-12Bibliographically approved

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Rutgersson, AnnaSemedo, AlvaroCarlsson, BjörnRajesh, Kumar

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