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Pathways of basal meltwater from Antarctic ice shelves: a model study

Citation

Kusahara, K and Hasumi, H, Pathways of basal meltwater from Antarctic ice shelves: a model study, Journal of Geophysical Research: Oceans, 119, (9) pp. 5690-5704. ISSN 2169-9275 (2014) [Refereed Article]


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Copyright Statement

Copyright 2014 American Geophysical Union. Kusahara, K., and H. Hasumi (2014), Pathways of basal meltwater from Antarctic ice shelves: A model study, Journal of geophysical research: oceans, 119(9), 5690-5704, 10.1002/2014JC009915 To view the published open abstract, go to http://dx.doi.org/10.1002/2014JC009915

DOI: doi:10.1002/2014JC009915

Abstract

We investigate spreading pathways of basal meltwater released from all Antarctic ice shelves using a circumpolar coupled ice shelf-sea ice-ocean model that reproduces major features of the Southern Ocean circulation, including the Antarctic Circumpolar Current (ACC). Several independent virtual tracers are used to identify detailed pathways of basal meltwaters. The spreading pathways of the meltwater tracers depend on formation sites, because the meltwaters are transported by local ambient ocean circulation. Meltwaters from ice shelves in the Weddell and Amundsen-Bellingshausen Seas in surface/subsurface layers are effectively advected to lower latitudes with the ACC. Although a large portion of the basal meltwaters is present in surface and subsurface layers, a part of the basal meltwaters penetrates into the bottom layer through active dense water formation along the Antarctic coastal margins. The signals at the seafloor extend along the topography, showing a horizontal distribution similar to the observed spreading of Antarctic Bottom Water. Meltwaters originating from ice shelves in the Weddell and Ross Seas and in the Indian sector significantly contribute to the bottom signals. A series of numerical experiments in which thermodynamic interaction between the ice shelf and ocean is neglected regionally demonstrates that the basal meltwater of each ice shelf impacts sea ice and/or ocean thermohaline circulation in the Southern Ocean.

Item Details

Item Type:Refereed Article
Keywords:ice shelf-sea ice-ocean modeling, virtual tracer
Research Division:Earth Sciences
Research Group:Atmospheric Sciences
Research Field:Climate Change Processes
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts)
Author:Kusahara, K (Dr Kazuya Kusahara)
ID Code:109884
Year Published:2014
Web of Science® Times Cited:9
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2016-07-06
Last Modified:2016-10-26
Downloads:45 View Download Statistics

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