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Estimating boundary layer fluxes from shipboard measurements of dissipations of turbulent kinetic energy and temperature variance

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Author
Johnston, William Edward
Date
1974-03
Advisor
Davidson, Kenneth L.
Second Reader
Houlihan, Thomas M.
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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.
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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.
URI
http://hdl.handle.net/10945/16995
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