Estimating boundary layer fluxes from shipboard measurements of dissipations of turbulent kinetic energy and temperature variance
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Authors
Johnston, William Edward
Subjects
Turbulence
Marine boundary layer
Dissipation of turbulent kinetic energy
Momentum flux
Friction velocity
Marine boundary layer
Dissipation of turbulent kinetic energy
Momentum flux
Friction velocity
Advisors
Davidson, Kenneth L.
Date of Issue
1974-03
Date
March 1974
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Velocity and temperature fluctuation measurements were made over the open ocean from instruments mounted on the R/V ACANIA. These data were examined to determine the
validity of present formulations and prediction techniques. Values of momentum flux, u* 2, were inferred from the rate of dissipation of turbulent kinetic energy, E. Dissipation values were obtained from spectral estimates and inner scale estimates. Values of u* were examined for representativeness on the basis of the constant-flux assumption and by comparisons with other studies. The vertical
variation of the dissipation rate was examined for possible effects of stability and wind-wav e
coupling. The momentum flux, computed from spectra, supported the constant-flux assumption for neutral conditions. For
periods of instability, the stability corrections applied to the vertical variation of E resulted in the proper adjustments toward the predicted slope. The reductions in momentum transfer during periods of stable stratifications were consistent with wind-wave coupling effects described by Davidson. The shape of a spectrum of temperature fluctuations was in
agreement with predictions.
Type
Thesis
Description
Series/Report No
Department
Meteorology
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.