BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Talks.cam//talks.cam.ac.uk// X-WR-CALNAME:Talks.cam BEGIN:VEVENT SUMMARY:Dissipation of wind waves by pancake and frazil ice in the autumn Beaufort Sea - Erick Rogers (U.S. Naval Research Laboratory) DTSTART:20170906T140000Z DTEND:20170906T153000Z UID:TALK79331@talks.cam.ac.uk CONTACT:INI IT DESCRIPTION:I will be presenting the following paper:
W.E. Rogers\, J . Thomson\, H.H. Shen M.J. Doble\, P. Wadhams and S. Cheng\, 2016:
Dissipation of wind waves by pancake and frazil ic e in the autumn Beaufort Sea
Journal of Geophysical Research: Oceans vol 121 7991-8007 doi:10.1002/2016JC012251
The full paper ma y be found at the link above.
The abstract follows:
A model for wind-generated surface gravity waves\, WAVEWATCH III (R)\, is used to anal yze 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&ndash\ ;14 October 2015\, for which extensive buoy and ship-borne measurements we re made during a research cruise. The model\, which uses a viscoelastic pa rameterization to represent the impact of sea ice on the waves\, is found to have good skill&mdash\;after calibration of the effective viscosity&mda sh\;for prediction of total energy\, but over-predicts dissipation of high frequency energy by the sea ice. This shortcoming motivates detailed anal ysis of the apparent dissipation rate. A new inversion method is applied t o yield\, for each buoy spectrum\, the inferred dissipation rate as a func tion of wave frequency. For 102 of the measured wave spectra\, visual obse rvations of the sea ice were available from buoy-mounted cameras\,and ice categories (primarily for varying forms of pancake and frazil ice) are ass igned to each based on the photographs. When comparing the inversion-deriv ed dissipation profiles against the independently derived ice categories\, there is remarkable correspondence\, with clear sorting of dissipation pr ofiles into groups of similar ice type. These profiles are largely monoton ic: they do not exhibit the &lsquo\;&lsquo\;roll-over&rsquo\;&rsquo\; that has been found at high frequencies in some previous observat ional studies.

The introduction to the seminar will include a g eneral overview of wave forecasting for the Arctic.
Public release statement: The published paper has been approved for public release. T he introduction/overview slides are pulled from earlier presentations whic h were approved for public release.
 LOCATION:Seminar Room 2\, Newton Institute END:VEVENT END:VCALENDAR