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Simulation of the Wind-Forced Near-Surface Circulation in Knight Inlet: A Parameterization of the Roughness Length

Simulation of the Wind-Forced Near-Surface Circulation in Knight Inlet: A Parameterization of the... Month-long observations of along-channel velocity made close to the surface of Knight Inlet are used with a numerical model to estimate the roughness length z 0 on the water side of the air––sea interface. In analogy with a very common parameterization for z 0 on the air side of the air––sea interface, z 0 is parameterized in the numerical model as z 0 == au 2 ∗∗ / g where u ∗∗ == ( ττ / ρρ ) 1/2 is the friction velocity, g is the acceleration due to gravity, ττ is the wind stress, ρρ is the density of water, and a is an empirical constant. It is found that a ≈≈ O (10 5 ) for the dataset from Knight Inlet, a value four orders of magnitude larger than the value commonly used to estimate z 0 on the air side of the air––sea interface. When compared to empirical estimates of the significant wave height H s , it is found that z 0 ≈≈ O ( H s ). Further evidence is provided that a numerical model that uses the Mellor––Yamada level 2.5 turbulence closure scheme can simulate the near-surface, wind-forced circulation quite well. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Physical Oceanography American Meteorological Society

Simulation of the Wind-Forced Near-Surface Circulation in Knight Inlet: A Parameterization of the Roughness Length

Journal of Physical Oceanography , Volume 29 (6) – Nov 13, 1997

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Publisher
American Meteorological Society
Copyright
Copyright © 1997 American Meteorological Society
ISSN
1520-0485
DOI
10.1175/1520-0485(1999)029<1363:SOTWFN>2.0.CO;2
Publisher site
See Article on Publisher Site

Abstract

Month-long observations of along-channel velocity made close to the surface of Knight Inlet are used with a numerical model to estimate the roughness length z 0 on the water side of the air––sea interface. In analogy with a very common parameterization for z 0 on the air side of the air––sea interface, z 0 is parameterized in the numerical model as z 0 == au 2 ∗∗ / g where u ∗∗ == ( ττ / ρρ ) 1/2 is the friction velocity, g is the acceleration due to gravity, ττ is the wind stress, ρρ is the density of water, and a is an empirical constant. It is found that a ≈≈ O (10 5 ) for the dataset from Knight Inlet, a value four orders of magnitude larger than the value commonly used to estimate z 0 on the air side of the air––sea interface. When compared to empirical estimates of the significant wave height H s , it is found that z 0 ≈≈ O ( H s ). Further evidence is provided that a numerical model that uses the Mellor––Yamada level 2.5 turbulence closure scheme can simulate the near-surface, wind-forced circulation quite well.

Journal

Journal of Physical OceanographyAmerican Meteorological Society

Published: Nov 13, 1997

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