期刊
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷 121, 期 11, 页码 7991-8007出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016JC012251
关键词
wave modeling; wave dissipation; pancake ice; Beaufort Sea
类别
资金
- Office of Naval Research [322]
- [N000141310290]
- [N0001413WX20825]
- [N000141310294]
- [N000141310284]
- Directorate For Geosciences
- Division Of Ocean Sciences [1332719] Funding Source: National Science Foundation
A model for wind-generated surface gravity waves, WAVEWATCH III (R), 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 skillafter calibration of the effective viscosityfor 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.
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