Rollover of apparent wave attenuation in ice covered seas

Wave attenuation from two field experiments in the ice‐covered Southern Ocean is examined. Instead of monotonically increasing with shorter waves, the measured apparent attenuation rate peaks at an intermediate wave period. This “rollover” phenomenon has been postulated as the result of wind input a...

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Main Authors: Li, Jingkai, Kohout, Alison L., Doble, Martin J., Wadhams, Peter, Guan, Changlong, Shen, Hayley H.
Other Authors: DHI-NTU Centre
Format: Article
Language:English
Published: 2018
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Online Access:https://hdl.handle.net/10356/87522
http://hdl.handle.net/10220/45440
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-875222020-09-26T22:03:52Z Rollover of apparent wave attenuation in ice covered seas Li, Jingkai Kohout, Alison L. Doble, Martin J. Wadhams, Peter Guan, Changlong Shen, Hayley H. DHI-NTU Centre Nanyang Environment and Water Research Institute Wave Attenuation Wave Frequencies Wave attenuation from two field experiments in the ice‐covered Southern Ocean is examined. Instead of monotonically increasing with shorter waves, the measured apparent attenuation rate peaks at an intermediate wave period. This “rollover” phenomenon has been postulated as the result of wind input and nonlinear energy transfer between wave frequencies. Using WAVEWATCH III®, we first validate the model results with available buoy data, then use the model data to analyze the apparent wave attenuation. With the choice of source parameterizations used in this study, it is shown that rollover of the apparent attenuation exists when wind input and nonlinear transfer are present, independent of the different wave attenuation models used. The period of rollover increases with increasing distance between buoys. Furthermore, the apparent attenuation for shorter waves drops with increasing separation between buoys or increasing wind input. These phenomena are direct consequences of the wind input and nonlinear energy transfer, which offset the damping caused by the intervening ice. MOE (Min. of Education, S’pore) Published version 2018-08-03T03:54:42Z 2019-12-06T16:43:41Z 2018-08-03T03:54:42Z 2019-12-06T16:43:41Z 2017 Journal Article Li, J., Kohout, A. L., Doble, M. J., Wadhams, P., Guan, C., & Shen, H. H. (2017). Rollover of apparent wave attenuation in ice covered seas. Journal of Geophysical Research: Oceans, 122(11), 8557-8566. 2169-9275 https://hdl.handle.net/10356/87522 http://hdl.handle.net/10220/45440 10.1002/2017JC012978 en Journal of Geophysical Research: Oceans © 2017 American Geophysical Union. This paper was published in Journal of Geophysical Research: Oceans and is made available as an electronic reprint (preprint) with permission of American Geophysical Union. The published version is available at: [http://dx.doi.org/10.1002/2017JC012978]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 10 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Wave Attenuation
Wave Frequencies
spellingShingle Wave Attenuation
Wave Frequencies
Li, Jingkai
Kohout, Alison L.
Doble, Martin J.
Wadhams, Peter
Guan, Changlong
Shen, Hayley H.
Rollover of apparent wave attenuation in ice covered seas
description Wave attenuation from two field experiments in the ice‐covered Southern Ocean is examined. Instead of monotonically increasing with shorter waves, the measured apparent attenuation rate peaks at an intermediate wave period. This “rollover” phenomenon has been postulated as the result of wind input and nonlinear energy transfer between wave frequencies. Using WAVEWATCH III®, we first validate the model results with available buoy data, then use the model data to analyze the apparent wave attenuation. With the choice of source parameterizations used in this study, it is shown that rollover of the apparent attenuation exists when wind input and nonlinear transfer are present, independent of the different wave attenuation models used. The period of rollover increases with increasing distance between buoys. Furthermore, the apparent attenuation for shorter waves drops with increasing separation between buoys or increasing wind input. These phenomena are direct consequences of the wind input and nonlinear energy transfer, which offset the damping caused by the intervening ice.
author2 DHI-NTU Centre
author_facet DHI-NTU Centre
Li, Jingkai
Kohout, Alison L.
Doble, Martin J.
Wadhams, Peter
Guan, Changlong
Shen, Hayley H.
format Article
author Li, Jingkai
Kohout, Alison L.
Doble, Martin J.
Wadhams, Peter
Guan, Changlong
Shen, Hayley H.
author_sort Li, Jingkai
title Rollover of apparent wave attenuation in ice covered seas
title_short Rollover of apparent wave attenuation in ice covered seas
title_full Rollover of apparent wave attenuation in ice covered seas
title_fullStr Rollover of apparent wave attenuation in ice covered seas
title_full_unstemmed Rollover of apparent wave attenuation in ice covered seas
title_sort rollover of apparent wave attenuation in ice covered seas
publishDate 2018
url https://hdl.handle.net/10356/87522
http://hdl.handle.net/10220/45440
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