Downscaling a twentieth century global climate simulation to the North Sea |
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| Authors: | Bjørn Ådlandsvik Mats Bentsen |
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| Institution: | (1) Institute of Marine Research, P.O. Box 1870, Nordnes, N-5817 Bergen, Norway;(2) Nansen Environmental and Remote Sensing Center, Bergen, Norway;(3) Bjerknes Centre for Climate Research, Bergen, Norway |
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| Abstract: | The regional ocean model system (ROMS) is used to downscale a 26-year period of the twentieth century 20C3M experiment from
the global coupled Bergen climate model (BCM) for the North Sea. Compared to an observational-based climatology, BCM have
good results on the mean temperature, except for too low winter temperature. This is connected to a too weak inflow of Atlantic
water. The downscaling gives added value to the BCM results by providing regional details, doubling the Atlantic inflow, and
improving the mean winter temperature. For mean salinity, BCM has values very close to the climatology, whereas the downscaling
becomes too fresh. The downscaling, however, improves the sea surface salinity, the vertical structure, and the Norwegian
Coastal Current. It is concluded that the downscaling procedure as presented here is a suitable tool for assessing the future
Atlantic inflow and sea temperature in the North Sea based on a global climate projection. |
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| Keywords: | North Sea Marine climate Marine downscaling |
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