The Decay Rate of Ocean Swell Observed by Altimeter

Young, Ian R.; Babanin, Alexander V.; Zieger, Stefan

doi:10.1175/jpo-d-13-083.1

Cited by 83 publications

(90 citation statements)

References 29 publications

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“…Thus reckoned, b 1 was chosen to be 0.002. (We note that more recent measurements by Young et al, 2013 suggest a slightly smaller value of between 0.0014 and 0.0017, not too dissimilar from the results of Babanin, 2011, especially given that these values assume a constant value for b 1 .) Assuming a steady state where the turbulence dissipation and production are equal, the final form for the turbulence production due to the wave orbital motion is…”

Section: Further Commentscontrasting

confidence: 40%

“…6) and attempt to find an empirical closure coefficient. On the other hand, the observational data from Young et al (2013) suggest that the parameterisation does, on the mean, a good job of modelling the rate of swell dissipation in the ocean, so for ocean modelling applications it should be adequate. As the model time step is decreased, however, the model would probably benefit from this kind of refinement.…”

Section: Further Commentsmentioning

confidence: 99%

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One-dimensional modelling of upper ocean mixing by turbulence due to wave orbital motion

Ghantous

Babanin

2014

Nonlin. Processes Geophys.

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Abstract. Mixing of the upper ocean affects the sea surface temperature by bringing deeper, colder water to the surface. Because even small changes in the surface temperature can have a large impact on weather and climate, accurately determining the rate of mixing is of central importance for forecasting. Although there are several mixing mechanisms, one that has until recently been overlooked is the effect of turbulence generated by non-breaking, wind-generated surface waves.Lately there has been a lot of interest in introducing this mechanism into ocean mixing models, and real gains have been made in terms of increased fidelity to observational data. However, our knowledge of the mechanism is still incomplete. We indicate areas where we believe the existing parameterisations need refinement and propose an alternative one.We use two of the parameterisations to demonstrate the effect on the mixed layer of wave-induced turbulence by applying them to a one-dimensional mixing model and a stable temperature profile. Our modelling experiment suggests a strong effect on sea surface temperature due to non-breaking wave-induced turbulent mixing.

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Section: Further Commentscontrasting

confidence: 40%

Section: Further Commentsmentioning

confidence: 99%

One-dimensional modelling of upper ocean mixing by turbulence due to wave orbital motion

Ghantous

Babanin

2014

Nonlin. Processes Geophys.

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“…However, these techniques typically filter the data too aggressively, removing much valuable and reliable data close to reefs, which are required for the present research. Thus, the raw satellite altimeter passes were visually checked for obvious data errors and regions where data spikes were present were manually excluded, as was done by Young et al (2013). In the present application, interest is in the attenuation of the altimeter-measured wave height across the reef matrix.…”

Section: Satellite Altimeter Datamentioning

confidence: 99%

The large-scale influence of the Great Barrier Reef matrix on wave attenuation

et al. 2014

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Offshore reef systems consist of individual reefs, with spaces in between, which together constitute the reef matrix. This is the first comprehensive, large-scale study, of the influence of an offshore reef system on wave climate and wave transmission. The focus was on the Great Barrier Reef (GBR), Australia, utilizing a 16-yr record of wave height from seven satellite altimeters. Within the GBR matrix, the wave climate is not strongly dependent on reef matrix submergence. This suggests that after initial wave breaking at the seaward edge of the reef matrix, wave energy that penetrates the matrix has little depth modulation. There is no clear evidence to suggest that as reef matrix porosity (ratio of spaces between individual reefs to reef area) decreases, wave attenuation increases. This is because individual reefs cast a wave shadow much larger than the reef itself; thus, a matrix of isolated reefs is remarkably effective at attenuating wave energy. This weak dependence of transmitted wave energy on depth of reef submergence, and reef matrix porosity, is also evident in the lee of the GBR matrix. Here, wave conditions appear to be dependent largely on local wind speed, rather than wave conditions either seaward, or within the reef matrix. This is because the GBR matrix is a very effective wave absorber, irrespective of water depth and reef matrix porosity.

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“…Sec- Table 1. Bottom -attenuation of swell for models Ardhuin et al (2009);Young et al (2013) and one of this paper (see the legend). Results of duration-limited simulations are recasted into dependencies on fetch by simple transformation (Eq.…”

Section: Discussion Swell and The Ocean Environmentmentioning

confidence: 99%

“…Synthetic aperture radar (SAR) allows for a spatial resolution of up to tens of meters (e.g., Ardhuin et al, 2010;Young et al, 2013). Satellite altimeters measure wave height averaged over a snapshot of a few square kilometers.…”

Section: Physical Models Of Ocean Swellmentioning

confidence: 99%

Ocean swell within the kinetic equation for water waves

Badulin

Захаров

2017

Nonlin. Processes Geophys.

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Abstract. Results of extensive simulations of swell evolution within the duration-limited setup for the kinetic Hasselmann equation for long durations of up to 2 × 10 6 s are presented. Basic solutions of the theory of weak turbulence, the so-called Kolmogorov-Zakharov solutions, are shown to be relevant to the results of the simulations. Features of selfsimilarity of wave spectra are detailed and their impact on methods of ocean swell monitoring is discussed. Essential drop in wave energy (wave height) due to wave-wave interactions is found at the initial stages of swell evolution (on the order of 1000 km for typical parameters of the ocean swell). At longer times, wave-wave interactions are responsible for a universal angular distribution of wave spectra in a wide range of initial conditions. Weak power-law attenuation of swell within the Hasselmann equation is not consistent with results of ocean swell tracking from satellite altimetry and SAR (synthetic aperture radar) data. At the same time, the relatively fast weakening of wave-wave interactions makes the swell evolution sensitive to other effects. In particular, as shown, coupling with locally generated wind waves can force the swell to grow in relatively light winds.

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The Decay Rate of Ocean Swell Observed by Altimeter

Cited by 83 publications

References 29 publications

One-dimensional modelling of upper ocean mixing by turbulence due to wave orbital motion

One-dimensional modelling of upper ocean mixing by turbulence due to wave orbital motion

The large-scale influence of the Great Barrier Reef matrix on wave attenuation

Ocean swell within the kinetic equation for water waves

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