Inertial dissipation method applied to derive turbulent fluxes over the ocean during the Surface of the Ocean, Fluxes and Interactions with the Atmosphere/Atlantic Stratocumulus Transition Experiment (SOFIA/ASTEX) and Structure des Echanges Mer‐Atmosphere, Proprietes des Heterogeneites Oceaniques: Recherche Experimentale (SEMAPHORE) experiments with low to moderate wind speeds

Dupuis, Hélène; Taylor, Peter K.; Weill, Alain; Katsaros, Kristina B.

doi:10.1029/97jc00446

Cited by 67 publications

(54 citation statements)

References 32 publications

(28 reference statements)

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“…In the neutral limit, our fitted value of −0.25 implies a larger transport than suggested by Caughy and Wyngaard (1979) (0.0) and Dupuis et al (1997) (−0.17) but lower than the value suggested from Albertson et al (1997) of −0.39. In a near-neutral range our expression is nonlinear as a consequence of the nonlinearity of the shear production term.…”

Section: E Nilsson Et Al: Tke Budget and Boundary Layer Descriptioncontrasting

confidence: 44%

“…For z/L below −1, this is approximately a linear equation, 0.5z/L, and implies somewhat lower transport than a study focused on this imbalance term by Dupuis et al (1997), who found a best-fit linear relationship of 0.69 z/L using an extensive oceanic data set. In the neutral limit, our fitted value of −0.25 implies a larger transport than suggested by Caughy and Wyngaard (1979) (0.0) and Dupuis et al (1997) (−0.17) but lower than the value suggested from Albertson et al (1997) of −0.39.…”

Section: E Nilsson Et Al: Tke Budget and Boundary Layer Descriptionmentioning

confidence: 99%

“…Over a limited vertical extent, however, such an argument needs to be examined further. The study by Dupuis et al (1997), for instance, suggests that a significant near-surface transport of TKE can occur in homogeneous conditions over the ocean, and Puhales et al (2013) focused on the height variation in transport terms from LES. Shear production of TKE has also been discussed as a cause that can maintain near-surface TKE even when the buoyancy flux decays at the end of the afternoon, but no study has, to our knowledge, specifically focused on the TKE budget during the afternoon transition from an observational perspective to assess the relative importance of these factors.…”

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confidence: 99%

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Turbulence kinetic energy budget during the afternoon transition – Part 1: Observed surface TKE budget and boundary layer description for 10 intensive observation period days

et al. 2016

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Abstract. The decay of turbulence kinetic energy (TKE) and its budget in the afternoon period from midday until zerobuoyancy flux at the surface is studied in a two-part paper by means of measurements from the Boundary Layer Late Afternoon and Sunset Turbulence (BLLAST) field campaign for 10 intensive observation period days. Here, in Part 1, near-surface measurements from a small tower are used to estimate a TKE budget. The overall boundary layer characteristics and mesoscale situation at the site are also described based upon taller tower measurements, radiosoundings and remote sensing instrumentation. Analysis of the TKE budget during the afternoon transition reveals a variety of different surface layer dynamics in terms of TKE and TKE decay. This is largely attributed to variations in the 8 m wind speed, which is responsible for different amounts of nearsurface shear production on different afternoons and variations within some of the afternoon periods. The partitioning of near-surface production into local dissipation and transport in neutral and unstably stratified conditions was investigated. Although variations exist both between and within afternoons, as a rule of thumb, our results suggest that about 50 % of the near-surface production of TKE is compensated for by local dissipation near the surface, leaving about 50 % available for transport. This result indicates that it is important to also consider TKE transport as a factor influencing the near-surface TKE decay rate, which in many earlier studies has mainly been linked with the production terms of TKE by buoyancy and wind shear. We also conclude that the TKE tendency is smaller than the other budget terms, indicating a quasi-stationary evolution of TKE in the afternoon transition. Even though the TKE tendency was observed to be small, a strong correlation to mean buoyancy production of −0.69 was found for the afternoon period. For comparison with previous results, the TKE budget terms are normalized with friction velocity and measurement height and discussed in the framework of Monin-Obukhov similarity theory. Empirically fitted expressions are presented. Alternatively, we also suggest a non-local parametrization of dissipation using a TKE-length scale model which takes into account the boundary layer depth in addition to distance above the ground. The non-local formulation is shown to give a better description of dissipation compared to a local parametrization.

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Section: E Nilsson Et Al: Tke Budget and Boundary Layer Descriptioncontrasting

confidence: 44%

Section: E Nilsson Et Al: Tke Budget and Boundary Layer Descriptionmentioning

confidence: 99%

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confidence: 99%

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Turbulence kinetic energy budget during the afternoon transition – Part 1: Observed surface TKE budget and boundary layer description for 10 intensive observation period days

et al. 2016

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“…The frequency range that can be used for estimating fluxes with the spectral method, or ID method in the following (Dupuis et al, 1997) is restricted to 3-9 Hz without correction, because in this range, the slope of the linear fit to data is the closest to a value of -5/3, which is nominal for applying the ID method. Note that after correction, the frequency range could be extended to frequencies in the 1-3 Hz range.…”

Section: B Motion and Its Impact On Wind Measurementsmentioning

confidence: 99%

A New Platform for the Determination of Air–Sea Fluxes (OCARINA): Overview and First Results

Bourras

Branger

Reverdin

et al. 2014

Journal of Atmospheric and Oceanic Technology

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The present paper describes a new type of floating platform that was specifically designed for estimating air-sea fluxes, investigating turbulence characteristics in the atmospheric surface boundary layer, and studying wind-wave interactions. With its design, it can be deployed in the open ocean or in shallow water areas. The system is designed to be used from a research vessel. It can operate for ~10 hours as a drifting wave rider and three hours under power. Turbulence and meteorological instrument packages are placed at a low altitude (1-1.5 m). It was deployed for validation purposes during the FROMVAR 2011 experiment off the west coast of Brittany (France). Wind friction velocity and surface turbulent buoyancy flux were estimated using eddy-covariance, spectral, bulk and profile methods. The comparisons of the four methods show a reasonable agreement except for the spectral buoyancy flux. This suggests that the platform design is correct. Also the wind measured at a fixed height above the sea shows spectral coherence with wave heights, such that wind and swell are in phase, with largest wind values on top of swell crests. This result in qualitative agreement with current model predictions supports the capability of OCARINA to investigate wind-swell interactions. 3 IntroductionAir-sea fluxes of momentum and heat, atmospheric turbulence in the surface atmospheric boundary layer, and wind-wave interactions are key characteristics that are needed to validate and improve dynamical models of the atmosphere, the upper ocean and waves.

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“…From the ship data at the foredeck mast the turbulent flux of momentum, sensible heat and latent heat were computed, when the turbulence instruments were operating, with the inertial dissipation technique in order to compute the bulk coefficients [Dupuis et aL, 1995[Dupuis et aL, , 1997. It was assumed that the turbulence measurements were performed in the surface, constant flux layer within which the Monin-Obukhov similarity theory can be applied, and that the computed flux can be considered as surface flux.…”

Section: Ship Datamentioning

confidence: 99%

Comparison of sea surface flux measured by instrumented aircraft and ship during SOFIA and SEMAPHORE experiments

Durand¹,

Dupuis²,

Lambert³

et al. 1998

J. Geophys. Res.

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Abstract: Abstract.The

Cited by 67 publications

References 32 publications

Turbulence kinetic energy budget during the afternoon transition – Part 1: Observed surface TKE budget and boundary layer description for 10 intensive observation period days

Turbulence kinetic energy budget during the afternoon transition – Part 1: Observed surface TKE budget and boundary layer description for 10 intensive observation period days

A New Platform for the Determination of Air–Sea Fluxes (OCARINA): Overview and First Results

Comparison of sea surface flux measured by instrumented aircraft and ship during SOFIA and SEMAPHORE experiments

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