Coupling hydrodynamic and wave models: first step and sensitivity experiments in the Mediterranean Sea.

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Bibliographic Details
Title:	Coupling hydrodynamic and wave models: first step and sensitivity experiments in the Mediterranean Sea.
Authors:	Clementi, Emanuela¹ emanuela.clementi@ingv.it, Oddo, Paolo, Drudi, Massimiliano¹, Pinardi, Nadia, Korres, Gerasimos², Grandi, Alessandro¹
Source:	Ocean Dynamics. Oct2017, Vol. 67 Issue 10, p1293-1312. 20p.
Subjects:	Mathematical models of hydrodynamics, Ocean circulation, Wind waves, Oceanographic buoys, Remote sensing, Mathematical models, Marine ecology
Geographic Terms:	Mediterranean Sea
Abstract:	This work describes the first step towards a fully coupled modelling system composed of an ocean circulation and a wind wave model. Sensitivity experiments are presented for the Mediterranean Sea where the hydrodynamic model NEMO is coupled with the third-generation wave model WaveWatchIII (WW3). Both models are implemented at 1/16° horizontal resolution and are forced by ECMWF 1/4° horizontal resolution atmospheric fields. The models are two-way coupled at hourly intervals exchanging the following fields: sea surface currents and temperature are transferred from NEMO to WW3 by modifying the mean momentum transfer of waves and the wind speed stability parameter, respectively. The neutral drag coefficient computed by WW3 is then passed to NEMO, which computes the surface stress. Five-year (2009-2013) numerical experiments were carried out in both uncoupled and coupled mode. In order to validate the modelling system, numerical results were compared with coastal and drifting buoys and remote sensing data. The results show that the coupling of currents with waves improves the representation of the wave spectrum. However, the wave-induced drag coefficient shows only minor improvements in NEMO circulation fields, such as temperature, salinity, and currents. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	This work describes the first step towards a fully coupled modelling system composed of an ocean circulation and a wind wave model. Sensitivity experiments are presented for the Mediterranean Sea where the hydrodynamic model NEMO is coupled with the third-generation wave model WaveWatchIII (WW3). Both models are implemented at 1/16° horizontal resolution and are forced by ECMWF 1/4° horizontal resolution atmospheric fields. The models are two-way coupled at hourly intervals exchanging the following fields: sea surface currents and temperature are transferred from NEMO to WW3 by modifying the mean momentum transfer of waves and the wind speed stability parameter, respectively. The neutral drag coefficient computed by WW3 is then passed to NEMO, which computes the surface stress. Five-year (2009-2013) numerical experiments were carried out in both uncoupled and coupled mode. In order to validate the modelling system, numerical results were compared with coastal and drifting buoys and remote sensing data. The results show that the coupling of currents with waves improves the representation of the wave spectrum. However, the wave-induced drag coefficient shows only minor improvements in NEMO circulation fields, such as temperature, salinity, and currents. [ABSTRACT FROM AUTHOR]
ISSN:	16167341
DOI:	10.1007/s10236-017-1087-7