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Measurements of Ocean Surface Waves and Surface Turbulence 2310 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 39 Measurements of Ocean Surface Turbulence and Wave–Turbulence Interactions FABRICE VERON College of Marine and Earth Studies, University of Delaware, Newark, Delaware W. KENDALL MELVILLE AND LUC LENAIN Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California (Manuscript received 24 March 2008, in final form 6 January 2009) ABSTRACT The uppermost layers of the ocean, along with the lower atmospheric boundary layer, play a crucial role in the air–sea fluxes of momentum, heat, and mass, thereby providing important boundary conditions for both the atmosphere and the ocean that control the evolution of weather and climate. In particular, the fluxes of heat and gas rely on exchange processes through the molecular layers, which are usually located within the viscous layer, which is in turn modulated by the waves and the turbulence at the free surface. The under- standing of the multiple interactions between molecular layers, viscous layers, waves, and turbulence is, therefore, paramount for an adequate parameterization of these fluxes. In this paper, the authors present evidence of a clear coupling between the surface waves and the surface turbulence. When averaged over time scales longer than the wave period, this coupling yields a spatial relationship between surface temperature, divergence, and vorticity fields that is consistent with spatial patterns of Langmuir turbulence. The resulting surface velocity field is hyperbolic, suggesting that significant stretching takes place in the surface layers. On time scales for which the surface wave field is resolved, the authors show that the surface turbulence is modulated by the waves in a manner that is qualitatively consistent with the rapid distortion theory. 1. Introduction include the so-called Monin–Obukhov similarity theory. The coupled air–sea boundary layers, however, are dy- The uppermost layers of the ocean, along with the namically quite different from a solid flat surface. For lower atmospheric boundary layer, play a crucial role example, the velocity field is not required to vanish at in the air–sea fluxes of momentum, heat, and mass, the interface. The ocean surface responds with drift thereby providing important boundary conditions for currents, surface waves, and turbulent eddies over a both the atmosphere and the ocean that control the broad range of scales. There are other phenomena—such evolution of weather and climate. as bubble injection, spray ejection, rainfall, foam, and The first models of boundary layers on both sides of surfactants—which further affect the dynamics and the air–sea interface were developed from our under- complicate the problem. Consequently, one would ex- standing of the turbulent flow over rigid flat surfaces and pect the dynamics of such an interfacial layer to be sig- extended to the field after the landmark Kansas ex- nificantly different from that over a solid flat surface periment on the terrestrial boundary layer (Businger under similar forcing conditions. Indeed, although there et al. 1971). Consequently, models of neutrally stratified is evidence that, in general and on average, the Monin– flows are based on the well-known ‘‘law of the wall,’’ Obukov similarity theory holds over the ocean (Edson which depends on the assumptions of a constant stress and Fairall 1998; Edson et al. 2004), there are also some layer and horizontal homogeneity. When the flow is notable differences. Over the last decade or so, it has also stratified, the ‘‘law of the wall’’ is further modified to become apparent that surface wave processes can play an important role in the kinematics and dynamics of the boundary layers (e.g., Janssen 1989, 1999; Komen et al. Corresponding author address: Fabrice Veron, College of Ma- rine and Earth Studies, University of Delaware, 112C Robinson 1994; Belcher and Hunt 1998; Hristov et al. 1998; Edson Hall, Newark, DE 19716. and Fairall 1998; Uz et al. 2002; Sullivan et al. 2004, E-mail: [email protected] 2007), and recent measurements and models of the drag DOI: 10.1175/2009JPO4019.1 Ó 2009 American Meteorological Society SEPTEMBER 2009 V E R O N E T A L . 2311 of the sea surface on the atmosphere at moderate-to-high the waves with the surface kinematic fields and surface wind speeds in fact suggest that much of the momentum temperature over long time scales, when the wave ef- transfer at the surface is supported by the form drag of fects are averaged in a manner similar to that which the waves. There is also evidence that the air–sea heat leads to the Craik–Leibovich mechanism (CL II) for the flux can be modulated by the wavy surface (Sullivan and formation of Langmuir circulation (Leibovich 1983). McWilliams 2002; Veron et al. 2008a). In addition, Finally, section 5 shows evidence of distortion of the breaking waves generate turbulence (Rapp and Melville surface turbulence by the waves over short times scales 1990; Agrawal et al. 1992; Thorpe 1993; Melville 1994; when the wave field is resolved. Anis and Moum 1995; Melville 1996; Terray et al. 1996; Veron and Melville 1999a), which along with small-scale 2. Experiments Langmuir circulations and coherent structures (Melville et al. 1998; Veron and Melville 1999b; McWilliams et al. The measurements described here were obtained 1997; Veron and Melville 2001; Sullivan et al. 2004, 2007), from a field experiment conducted from R/P FLIP, may lead to enhanced dissipation and mixing with sig- moored approximately 150 miles off the coast of nificant departures from the ‘‘law of the wall’’ and may southern California, west of Tanner Bank (32840.209N, also result in increased heat and gas transfer (Ja¨hne et al. 119819.469W; 300-m depth), during 20–26 August 2003. 1987; Hasse 1990; Ja¨hne and Haußecker 1998; Zappa The main instruments are composed of an integrated et al. 2001; Garbe et al. 2004; Schimpf et al. 2004; Turney active and passive infrared imaging and altimetry sys- et al. 2005). tem (Veron et al. 2008b), and an eddy covariance at- With such richness in the phenomena and dynamics mospheric flux package. Both systems are described in at the surface, one can also expect significant interac- more detail below. tions between currents, surface waves, and turbulence. a. Infrared imaging and altimetry system A well-known example is Langmuir circulation, which results from the interactions between vorticity and the The active and passive infrared imaging and altimetry Stokes drift generated by the surface waves (Leibovich system includes an infrared camera (Amber Gallileo), a 1983; Thorpe 2004). On smaller time scales, there is also 608W air-cooled CO2 laser (Synrad Firestar T60) evidence that the turbulence can be significantly cou- equipped with an industrial marking head (Synrad FH pled with the surface waves (Lumley and Terray 1983; index) with two computer-controlled galvanometers, a Cheung and Street 1988a,b; Thais and Magnaudet 1995; laser altimeter (Riegl LD90-3100EHS), a video camera Teixeira and Belcher 2002). (Pulnix TM-9701), a 6-degree-of-freedom motion pack- Because the air–sea transfers of heat and gas partly age (Watson Gyro E604), and a single-board com- rely on exchanges through the diffusive surface layers puter (PC Pentium 4). All instruments were enclosed in and because these layers are typically smaller than the weatherproof, air-conditioned aluminum housing. All viscous sublayer, our ability to adequately quantify instruments and computers were synchronized to within these fluxes depends on our understanding of the small- 2 ms and to GPS time. The infrared camera was set to scale turbulence that controls the dynamics of the mo- record temperature images (256 3 256 pixels) at 60 Hz, lecular layers.1 In turn, our understanding of the small- with a 2-ms integration time, yielding better than 15-mK scale turbulence depends on our understanding of the resolution. The footprint of the infrared camera was multiple interactions between the turbulence, currents, approximately 2 m 3 2 m. The video camera (768 3 484 and surface waves. pixels) was synchronized to the infrared camera and In this paper, we present results from field experi- acquired full frames at 30 Hz. The footprint of the in- ments that show evidence of coupling between the sur- frared camera was contained within the footprint of the face temperature, the surface turbulent velocity fields, video camera. The infrared CO2 laser and accompany- and the surface waves. We also show evidence of cou- ing marking head were used to actively lay down pat- pling between the surface waves and the turbulent fields. terns of thermal markers on the ocean surface to study In section 2, we summarize the experimental setup. In the rate of decay of an imposed surface temperature section 3, we present measurements of surface waves perturbation while tracking the Lagrangian velocity, and the velocity fields that provide the basis for the shear, and vorticity at the surface. Finally, the laser al- results presented here. Section 4 shows the coupling of timeter measured the distance to the water surface at 12 kHz (averaged down to 50 Hz) with a footprint of 5-cm diameter, contained within both the infrared and 1 In the case of gas transfer, these molecular layers can also be at video images. The system, among other things, yields the surface of entrained bubbles. the velocity at the surface by tracking active thermal 2312 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 39 markers laid down with the CO2 laser [thermal marking velocimetry (TMV)] or by performing cross-correlation analysis on the passive surface temperature fields [par- ticle image velocimetry (PIV)]. The detailed perfor- mance of the passive and active IR measurement system for ocean-surface kinematics is described in Veron et al. 2008b. b. Eddy covariance system In addition to the optical infrared system, we used an eddy covariance system to acquire supporting meteorological and atmospheric boundary layer flux data.
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