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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 108, NO. C3, 8063, doi:10.1029/2002JC001667, 2003

Constraining the inertial dissipation method using the vertical velocity variance

G. Dardier

Centre d'étude des Environnements Terrestre et Planétaires (CETP), Velizy, France


A. Weill

Centre d'étude des Environnements Terrestre et Planétaires (CETP), Velizy, France


H. Dupuis

Département de Géologie et d'Océanographie (DGO), Université Bordeaux I, UMR58, Talence, France


C. Guerin

Centre d'étude des Environnements Terrestre et Planétaires (CETP), Velizy, France


W. M. Drennan

Rosenstiel School of Marine and Atmospheric Science (RSMAS), University of Miami, Florida, USA


S. Brachet

Centre d'étude des Environnements Terrestre et Planétaires (CETP), Velizy, France
Rosenstiel School of Marine and Atmospheric Science (RSMAS), University of Miami, Florida, USA


F. Lohou

Centre d'étude des Environnements Terrestre et Planétaires (CETP), Velizy, France


R. Pedreros

Département de Géologie et d'Océanographie (DGO), Université Bordeaux I, UMR58, Talence, France


Abstract

The inertial dissipation method (IDM) is commonly used to measure turbulent fluxes over the ocean. It has the advantage over more direct methods in that it depends on the turbulent fluctuations only in the high frequencies of the so-called inertial subrange. These frequencies are above those of typical ship motions and are considered to be relatively unaffected by flow distortion. However, a drawback in applying the method is that the problem is underdetermined: estimation of the fluxes requires knowledge of the Obukhov length L, which is itself a function of the fluxes. The problem is typically solved by iteration, using an initial L estimated from bulk formulae. This introduces a possible dependency on the initial bulk estimate along with problems of convergence. Recently, several authors have proposed improvements to the basic algorithm. For instance, Dupuis et al. [1997] proposed a parameterization of the “imbalance term” in the budget of turbulent kinetic energy (TKE). We explore an alternative approach to the problem. In order to constrain the equations resulting from the IDM we use the vertical velocity variance, σw, measured from the research vessel L'Atalante and an ASIS buoy, both deployed during the 1998 FETCH experiment. These data are compared to several parameterizations of σw on stability derived in experiments. For unstable cases, the data are found to be well described by the Panofsky and Dutton [1984] parameterization, although the scatter of the data is higher for swell conditions than for pure wind sea, indicating a likely sea state effect. Using measured values of σw along with this parameterization, the inertial dissipation problem is fully specified. The convergence of the method is satisfactory, and it offers u* estimates independent of bulk formulae.

Published 13 March 2003.

Index Terms: 4504 Oceanography: Physical: Air/sea interactions (0312); 0312 Atmospheric Composition and Structure: Air/sea constituent fluxes (3339, 4504); 3339 Meteorology and Atmospheric Dynamics: Ocean/atmosphere interactions (0312, 4504).

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Citation: Dardier, G., A. Weill, H. Dupuis, C. Guerin, W. M. Drennan, S. Brachet, F. Lohou, and R. Pedreros (2003), Constraining the inertial dissipation method using the vertical velocity variance, J. Geophys. Res., 108(C3), 8063, doi:10.1029/2002JC001667.