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Eddy flux measurements over the ocean and related transfer coefficients

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Abstract

Eddy correlation measurements of vertical turbulent fluxes made during AMTEX 1975 are used to assess the reliability of flux prediction from established bulk transfer relations, using both surface-layer and planetary boundary-layer formulations. The surface-layer formulae predict momentum and latent heat fluxes to an accuracy comparable to the direct eddy correlation method, using transfer coefficients of C DN (at 10m and in neutral conditions) increasing with wind speed, and a constant C EN ∼- 1.5 × 10 −3. The data suggest C CHN , for sensible heat, increases significantly with wind speed and is on average 30% lower than C CEN The boundary-layer drag coefficient, C GD , agrees within about 40% of recently published values using a vertically averaged geostrophic wind to the height of the lowest temperature inversion, corrected for trajectory curvature. Values of θ * /δθ from which C CGH is derived, are in excellent agreement if the published values are modified to account for inappropriate surface temperatures used in their derivation. Preliminary values of C GE are also presented.

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Authors and Affiliations

  1. CSIRO Division of Atmospheric Physics, Aspendale, Victoria, Australia

    R. J. Francey & J. R. Garratt

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  1. R. J. Francey
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  2. J. R. Garratt
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Francey, R.J., Garratt, J.R. Eddy flux measurements over the ocean and related transfer coefficients. Boundary-Layer Meteorol 14, 153–166 (1978). https://doi.org/10.1007/BF00122616

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