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A Note on the Phillips Spectral Framework for Ocean Whitecaps

Banner, Michael L.; Zappa, Christopher J.; Gemmrich, Johannes R.

There has been a recent upsurge in interest in quantifying kinematic, dynamic, and energetic properties of wave breaking in the open ocean, especially in severe sea states. The underpinning observational and modeling framework is provided by the seminal paper of O. M. Phillips. In this note, a fundamental issue contributing to the scatter in results between investigators is highlighted. This issue relates to the choice of the independent variable used in the expression for the spectral density of the mean breaking crest length per unit area. This note investigates the consequences of the different choices of independent variable presently used by various investigators for validating Phillips model predictions for the spectral density of the breaking crest length per unit area and the associated spectral breaking strength coefficient. These spectral measures have a central role in inferring the associated turbulent kinetic energy dissipation rate and the momentum flux to the upper ocean from breaking wave observations.

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Title
Journal of Physical Oceanography
DOI
https://doi.org/10.1175/JPO-D-13-0126.1

More About This Work

Academic Units
Lamont-Doherty Earth Observatory
Ocean and Climate Physics
Publisher
American Meteorological Society
Published Here
February 22, 2016