Ardhuin, Fabrice; Merrifield, Sophia; Terrill, Eric; Otero, Mark; Grouazel, Antoine (2020). Data from: Ice break-up controls dissipation of wind-waves across Southern Ocean sea ice. UC San Diego Library Digital Collections. https://doi.org/10.6075/J0V40SM5

Sea ice inhibits the development of wind‐generated surface gravity waves which are the dominant factor in upper ocean mixing and air‐sea fluxes. In turn, sea ice properties are modified by wave action. Understanding the interaction of ice and waves is important for characterizing both air‐sea interactions and sea ice dynamics. Current leading theory attributes wave attenuation primarily to scattering by ice floes. Here we use new in situ wave measurements to show that attenuation is dominated by dissipation with negligible effect by scattering. Time series of wave height in ice exhibit an "on/off" behavior that is consistent with switching between two states of sea ice; a relatively unbroken state associated with strong damping (off), possibly caused by ice flexure, and very weak attenuation (on) across sea ice that has been broken up by wave action.

• 2018-05 to 2018-07

• 2020

• Ardhuin, Fabrice
• Grouazel, Antoine
• Merrifield, Sophia
• Otero, Mark
• Terrill, Eric

Freely drifting wave buoys were deployed in the Southern Ocean in 2018, and advected into advancing sea ice. The buoys concurrently measured wave conditions ranging from open water to 150 km into sea ice. The magnitude and a plausible cause of wave attenuation in sea ice was investigated using a numerical wave model (WAVEWATCH III, version 6.05).

Analysis was supported by the U.S. Office of Naval Research. We thank the New Zealand Navy for deploying the buoys.

• Antarctic Ocean
• Southern Ocean

• Sea ice
• Wind waves

Polygon: -61.7,-180 -61.7,-151.3 -67.1,-151.3, -67.1,-180 -61.7,-180

• data

• No linguistic content; Not applicable

Identifier: Antoine Grouazel: https://orcid.org/0000-0002-9113-9467

Identifier: Eric Terrill: https://orcid.org/0000-0003-1807-8351

Identifier: Fabrice Ardhuin: https://orcid.org/0000-0002-9309-9681

Identifier: Mark Otero: https://orcid.org/0000-0001-6848-752X

Identifier: Sophia Merrifield: https://orcid.org/0000-0002-4152-7285

Doi: https://doi.org/10.6075/J0V40SM5

Primary associated publication

• Ardhuin, F., Otero, M., Merrifield, S., Grouazel, A., & Terrill, E. (2020). Ice break‐up controls dissipation of wind‐waves across Southern Ocean sea ice. Geophysical Research Letters, 47, e2020GL087699. https://doi.org/10.1029/2020GL087699

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2022-11-28