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Estimates of the 10-m Neutral Sea Surface Drag Coefficient from Aircraft Eddy-Covariance Measurements

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Abstract
  • The 10-m neutral drag coefficient (C[subscript DN10]) over the sea is calculated using a large observational dataset consisting of 5800 estimates of the mean flow and the fluxes from aircraft eddy-covariance measurements. The dataset includes observations from 11 different experiments with four different research aircraft. One of the goals is to investigate how sensitive C[subscript DN10] is to the analysis method. As such, C[subscript DN10] derived from six unique processing schemes that involve different methods for averaging the surface stress and the wind speed are compared. Especially in weak winds, the resulting C[subscript DN10] values depend on the choice of processing. Four distinct regimes of C[subscript DN10] are identified: weak winds where calculating C[subscript DN10] is not well posed, moderate winds (4 to 10 m s⁻¹) where C[subscript DN10] is a constant, strong winds (10 to 20 m s⁻¹) where C[subscript DN10] increases linearly with increasing wind speed, and very strong winds (20 to 24 m s⁻¹) where C[subscript DN10] steadily decreases with increasing wind speed. However, as this last regime is based on data from a single experiment, additional data are needed to confirm this apparent decrease in C[subscript DN10] for winds exceeding 20 m s⁻¹.
  • Keywords: Heat flux, Turbulent fluxes, Water, Ocean, Momentum flux, Boundary layer, waves, Profiles, Bulk parameterization, Wind Stress
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  • Vickers, D., Mahrt, L., & Andreas, E. (2013). Estimates of the 10-m neutral sea surface drag coefficient from aircraft eddy-covariance measurements. Journal of Physical Oceanography, 43(2), 301-310. doi: 10.1175/JPO-D-12-0101.1
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  • 43
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  • 2
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  • The U.S. Office of Naval Research supported this work with Award N00014-11-1-0073 to Northwest Research Associates. ONR also supported ELA through the National Ocean Partnership Program with Award N00014-10-1-0154 to the University of Rhode Island, for whom he is a contractor.
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