Article Type:
Research Article

Effect of Reduced Diffusion on Surface Wind and Wave Fields

Luigi Cavaleri Istituto Studio Dinamica Grandi Masse, Venice, Italy

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Luciana Bertotti Istituto Studio Dinamica Grandi Masse, Venice, Italy

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Mariano Hortal European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom

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Martin Miller European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom

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Print Publication:
01 Nov 1997
DOI:
https://doi.org/10.1175/1520-0493(1997)125<3024:EORDOS>2.0.CO;2
Page(s):
3024–3029
Restricted access

Abstract

Horizontal diffusion is used in meteorological models to reduce noise in the shorter spatial scales and to increase numerical stability. In turn, this affects the surface wind distribution. A series of tests on real situations in the Mediterranean Sea has been done to explore the practical consequences on wind and wave fields. The results indicate a substantial reduction of the peak values, particularly in areas with strong spatial gradients, and a general smoothing of the fields, more evident where these are dominated by the local orography.

Corresponding author address: Dr. Luigi Cavaleri, Istituto Studio Dinamica Grandi Masse, San Polo 1364, 30125 Venezia, Italy.

Abstract

Horizontal diffusion is used in meteorological models to reduce noise in the shorter spatial scales and to increase numerical stability. In turn, this affects the surface wind distribution. A series of tests on real situations in the Mediterranean Sea has been done to explore the practical consequences on wind and wave fields. The results indicate a substantial reduction of the peak values, particularly in areas with strong spatial gradients, and a general smoothing of the fields, more evident where these are dominated by the local orography.

Corresponding author address: Dr. Luigi Cavaleri, Istituto Studio Dinamica Grandi Masse, San Polo 1364, 30125 Venezia, Italy.

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