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Lagrangian modelling of frazil ice in the ocean

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/61139

Title: Lagrangian modelling of frazil ice in the ocean
Authors: Matsumura, Yoshimasa Browse this author →KAKEN DB
Ohshima, Kay I. Browse this author
Keywords: frazil ice
ice/ocean interactions
sea-ice modelling
Issue Date: 1-Oct-2015
Publisher: International Glaciological Society (IGS)
Journal Title: Annals of glaciology
Volume: 56
Issue: 69
Start Page: 373
End Page: 382
Publisher DOI: 10.3189/2015AoG69A657
Abstract: A new modelling framework using Lagrangian particle tracking has been developed to assess dynamic and thermodynamic effects of underwater frazil ice. This frazil-ice model treats a Lagrangian particle as a bulk cluster of many frazil crystals, and calculates the thermodynamic growth of each particle and the corresponding budget of latent heat and fresh water. The effective density and viscosity of sea water depend on the mass fraction of underwater frazil ice, and hence affect ocean convection. An idealized experiment using our model successfully reproduces the formation of underwater frazil ice and its transition to grease ice at the surface. Because underwater frazil ice does not reduce the atmosphere/ocean heat exchange, surface heat flux and net sea-ice production in the experiment with frazil ice are relatively high compared with the experiment where surface cooling directly leads to columnar growth of a solid ice cover which effectively insulates the heat flux. These results suggest that large-scale sea-ice models which do not take account of the effects of frazil ice might underestimate atmosphere/ocean heat exchange, particularly at times of active new ice formation.
Rights: © 2015 International Glaciological Society
Relation: http://www.igsoc.org/
Type: article
URI: http://hdl.handle.net/2115/61139
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松村 義正

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