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Model predictions of wave overwash extent Into the marginal ice zone


Pitt, JPA and Bennetts, LG and Meylan, MH and Massom, RA and Toffoli, A, Model predictions of wave overwash extent Into the marginal ice zone, Journal of Geophysical Research: Oceans, 127, (10) Article e2022JC018707. ISSN 2169-9275 (2022) [Refereed Article]


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Copyright 2022 The Authors Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

DOI: doi:10.1029/2022JC018707


In the marginal ice zone (MIZ), where ocean waves and sea ice interact, waves can produce flows of water across ice floe surfaces in a process known as wave overwash. Overwash potentially influences wave propagation characteristics, floe thermodynamics, and floe surface biological and chemical processes. However, the extent of the MIZ affected by overwash and its dependence on prevailing wave and ice conditions is unknown. In this paper, we propose a model of overwash extent caused by irregular incoming waves into a MIZ consisting of a random floe field. We validate the overwash extent model against laboratory experiments. We use the model to study mild to extreme incoming waves to floe field characteristics of the spring–summer ice retreat and autumn–winter ice advance and with compact ice edges. Overwash is typically predicted to extend a few kilometers and is generally greater for the autumn–winter advance than the spring–summer retreat. The model predictions provide a basis for improved understanding of the impacts of ocean waves on the ice cover. We also apply the model to incoming waves and a floe field with a diffuse ice edge representative of conditions during a field experiment, predicting overwash extents up to 16 km. During the field experiment, the wave and ice floe properties were intermittently monitored by a camera system, demonstrating how the sparse field data available on overwash can be advanced.

Item Details

Item Type:Refereed Article
Keywords:Antarctic sea ice, marginal ice zone, ocean waves overwashing
Research Division:Earth Sciences
Research Group:Other earth sciences
Research Field:Earth system sciences
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Climate change models
UTAS Author:Massom, RA (Dr Robert Massom)
ID Code:154017
Year Published:2022
Deposited By:Australian Antarctic Program Partnership
Deposited On:2022-10-24
Last Modified:2022-11-28
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