Preprints
https://doi.org/10.5194/gmdd-7-9063-2014
https://doi.org/10.5194/gmdd-7-9063-2014

Submitted as: development and technical paper 18 Dec 2014

Submitted as: development and technical paper | 18 Dec 2014

Review status: this preprint was under review for the journal GMD but the revision was not accepted.

On the wind stress formulation over shallow waters in atmospheric models

P. A. Jiménez1,2 and J. Dudhia3 P. A. Jiménez and J. Dudhia
  • 1National Center for Atmospheric Research, Research Applications Laboratory, Boulder, CO, USA
  • 2CIEMAT, División de Energías Renovables, Madrid, Spain
  • 3National Center for Atmospheric Research, Mesoscale and Microscale Meteorology Division, Boulder, CO, USA

Abstract. The wind stress formulation over shallow waters is investigated using year-long observations of the wind profile within the first 100 m of the atmosphere and mesoscale simulations. The model experiments use a range of planetary boundary layer parameterizations in order to quantify the uncertainty related to the turbulent closure assumptions, and thus isolate the dominant influence of the roughness formulation. Results indicate that a positive wind speed bias exists when the common open ocean formulation for roughness is adopted. An alternative formulation consistent with shallow water observations is necessary to reconcile model results with observations, providing the first modeling evidence supporting the increase of surface drag over shallow waters. Including ocean bathymetry as static input data to atmospheric models constitutes an area where further research should be oriented.

P. A. Jiménez and J. Dudhia

 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

P. A. Jiménez and J. Dudhia

P. A. Jiménez and J. Dudhia

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Short summary
In spite of the substantial observational evidence supporting a higher drag over shallow waters than over the open ocean, regional and global models widely use a single formulation valid for the open ocean. Results of this work indicate that adding the extra drag is necessary to reconcile model results with long term observations of the wind profile within the first 100 m of the atmosphere, being the first modeling evidence supporting the reported added drag over shallow waters.