Relating wave attenuation to pancake ice thickness, using field measurements and model results

Doble, M; Carolis, Giacomo De; Meylan, Michael H.; Bidlot, Jean‐Raymond; Wadhams, Peter

doi:10.1002/2015gl063628

Cited by 84 publications

(127 citation statements)

References 22 publications

Supporting

Mentioning

119

Contrasting

Order By: Relevance

“…Doble et al . [] found k i values up to approximately

7 \times 1 0^{- 4}

m −1 in pancake ice near Antarctica, for waves of 8 second period, with values for thinner pancake being significantly smaller, e.g., 1

\times 1 0^{- 4}

m −1 . The reader is referred to other articles for examples of attenuation rate in non‐pancake floes: Wadhams et al .…”

Section: Resultsmentioning

confidence: 99%

“…It is, of course, unsurprising that of the ice types observed in the experiment, the “pancakes and frazil” sets have the highest estimated dissipation rates. Analysis of wave buoy data in the Antarctic has shown that wave attenuation (hence dissipation) can be directly scaled with pancake and frazil ice thickness [ Doble et al ., ]. Of the cases with mixed open water, grease, and frazil, the cases with brash pancakes have higher dissipation rate (i.e.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Dissipation of wind waves by pancake and frazil ice in the autumn Beaufort Sea

Rogers

Thomson

Shen

et al. 2016

J. Geophys. Res. Oceans

Self Cite

112

159

View full text Add to dashboard Cite

A model for wind‐generated surface gravity waves, WAVEWATCH III®, is used to analyze and interpret buoy measurements of wave spectra. The model is applied to a hindcast of a wave event in sea ice in the western Arctic, 11–14 October 2015, for which extensive buoy and ship‐borne measurements were made during a research cruise. The model, which uses a viscoelastic parameterization to represent the impact of sea ice on the waves, is found to have good skill—after calibration of the effective viscosity—for prediction of total energy, but over‐predicts dissipation of high frequency energy by the sea ice. This shortcoming motivates detailed analysis of the apparent dissipation rate. A new inversion method is applied to yield, for each buoy spectrum, the inferred dissipation rate as a function of wave frequency. For 102 of the measured wave spectra, visual observations of the sea ice were available from buoy‐mounted cameras, and ice categories (primarily for varying forms of pancake and frazil ice) are assigned to each based on the photographs. When comparing the inversion‐derived dissipation profiles against the independently derived ice categories, there is remarkable correspondence, with clear sorting of dissipation profiles into groups of similar ice type. These profiles are largely monotonic: they do not exhibit the “roll‐over” that has been found at high frequencies in some previous observational studies.

show abstract

“…Doble et al . [] found k i values up to approximately

7 \times 1 0^{- 4}

m −1 in pancake ice near Antarctica, for waves of 8 second period, with values for thinner pancake being significantly smaller, e.g., 1

\times 1 0^{- 4}

m −1 . The reader is referred to other articles for examples of attenuation rate in non‐pancake floes: Wadhams et al .…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Dissipation of wind waves by pancake and frazil ice in the autumn Beaufort Sea

Rogers

Thomson

Shen

et al. 2016

J. Geophys. Res. Oceans

Self Cite

112

159

View full text Add to dashboard Cite

show abstract

“…Purely viscous rheological models have also been used to model wave propagation in ice-infested seas as mentioned in section 1, and have been calibrated with success for pancake ice [see e.g., Doble et al, 2015]. It is then reasonable to investigate the fit to the attenuation data of Meylan et al [2014] by a simpler viscous layer model, which does not include elastic effects.…”

Section: Ws Model Without Elasticitymentioning

confidence: 99%

Comparison of viscoelastic‐type models for ocean wave attenuation in ice‐covered seas

2015

View full text Add to dashboard Cite

Continuum‐based models that describe the propagation of ocean waves in ice‐infested seas are considered, where the surface ocean layer (including ice floes, brash ice, etc.) is modeled by a homogeneous viscoelastic material which causes waves to attenuate as they travel through the medium. Three ice layer models are compared, namely a viscoelastic fluid layer model currently being trialed in the spectral wave model WAVEWATCH III® and two simpler viscoelastic thin beam models. All three models are two dimensional. A comparative analysis shows that one of the beam models provides similar predictions for wave attenuation and wavelength to the viscoelastic fluid model. The three models are calibrated using wave attenuation data recently collected in the Antarctic marginal ice zone as an example. Although agreement with the data is obtained with all three models, several important issues related to the viscoelastic fluid model are identified that raise questions about its suitability to characterize wave attenuation in ice‐covered seas. Viscoelastic beam models appear to provide a more robust parameterization of the phenomenon being modeled, but still remain questionable as a valid characterization of wave‐ice interactions generally.

show abstract

“…The two dominant mechanisms for wave attenuation in ice are due to discrete scattering from several small floes and/or inhomogeneities in the ice [ Kohout and Meylan , ], or viscous effects associated with an ice continuum from frazil and grease ice [ Weber , ], viscous effects in the water or ice [ Wang and Shen , ] or ice creep [ Wadhams , ]. Observations of attenuation have focused on lower frequency ice motion (less than 0.1 Hz) and use measurements over several kilometers to obtain accurate statistics [ Meylan et al ., ; Kohout et al ., ; Doble et al ., ].…”

Section: Wave Propagation In Icementioning

confidence: 99%

Observations of wave dispersion and attenuation in landfast ice

Sutherland

Rabault

2016

JGR Oceans

View full text Add to dashboard Cite

Observations of wave propagation in landfast ice were obtained in Tempelfjorden, Svalbard during March 2015. Wave motion was measured near the ice edge using inertial motion units and consisted of a combination of swell from the North Atlantic and wind‐generated waves. The waves were observed to be unidirectional in the ice with comparable magnitudes in the vertical and horizontal displacements. The dispersion relation was calculated from the measured phase difference between two adjacent sensors separated by a distance of approximately 60 m. Deviations from the gravity wave dispersion relation were observed during the growth phase of the waves and were consistent with the presence of flexural waves. This period of wave growth was accompanied by significant wave attenuation in the high frequency portion of the wave spectrum which persisted for 3–5 h.

show abstract

Relating wave attenuation to pancake ice thickness, using field measurements and model results

Cited by 84 publications

References 22 publications

Dissipation of wind waves by pancake and frazil ice in the autumn Beaufort Sea

Dissipation of wind waves by pancake and frazil ice in the autumn Beaufort Sea

Comparison of viscoelastic‐type models for ocean wave attenuation in ice‐covered seas

Observations of wave dispersion and attenuation in landfast ice

Contact Info

Product

Resources

About