Article Type:
Research Article

Application of a Subfilter-Scale Flux Model over the Ocean Using OHATS Field Data

Mark Kelly Department of Meteorology, The Pennsylvania State University, University Park, Pennsylvania

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John C. Wyngaard Department of Meteorology, and Department of Mechanical Engineering, The Pennsylvania State University, University Park, Pennsylvania

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Peter P. Sullivan Mesoscale and Microscale Meteorology Group, National Center for Atmospheric Research, Boulder, Colorado

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Print Publication:
01 Oct 2009
DOI:
https://doi.org/10.1175/2009JAS2903.1
Page(s):
3217–3225
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Abstract

Simple rate equation models for subfilter-scale scalar and momentum fluxes have previously been developed for application in the so-called “terra incognita” of atmospheric simulations, where the model resolution is comparable to the scale of turbulence. The models performed well over land, but only the scalar flux model appeared to perform adequately over the ocean. Analysis of data from the Ocean Horizontal Array Turbulence Study (OHATS) reveals a need to account for the moving ocean–air interface in the subfilter stress model. The authors develop simple parameterizations for the effect of surface-induced pressure fluctuations on the subfilter stress, leading to good predictions of subfilter momentum flux both over land and in OHATS.

* Current affiliation: Wind Energy Division, Risø National Lab/Danish Technical University, Roskilde, Denmark.

Corresponding author address: Mark Kelly, Wind Energy Division, Risø National Lab/Danish Technical University, Roskilde 4000, Denmark. Email: mark.c.kelly@risoe.dk

Abstract

Simple rate equation models for subfilter-scale scalar and momentum fluxes have previously been developed for application in the so-called “terra incognita” of atmospheric simulations, where the model resolution is comparable to the scale of turbulence. The models performed well over land, but only the scalar flux model appeared to perform adequately over the ocean. Analysis of data from the Ocean Horizontal Array Turbulence Study (OHATS) reveals a need to account for the moving ocean–air interface in the subfilter stress model. The authors develop simple parameterizations for the effect of surface-induced pressure fluctuations on the subfilter stress, leading to good predictions of subfilter momentum flux both over land and in OHATS.

* Current affiliation: Wind Energy Division, Risø National Lab/Danish Technical University, Roskilde, Denmark.

Corresponding author address: Mark Kelly, Wind Energy Division, Risø National Lab/Danish Technical University, Roskilde 4000, Denmark. Email: mark.c.kelly@risoe.dk

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