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Investigation of land ice-ocean interaction with a fully coupled ice-ocean model: 1. Model description and behavior

Author(s): Goldberg, D.N.; Little, C.M.; Sergienko, Olga V.; Gnanadesikan, A.; Hallberg, Robert W.; et al

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Abstract: Antarctic ice shelves interact closely with the ocean cavities beneath them, with ice shelf geometry influencing ocean cavity circulation, and heat from the ocean driving changes in the ice shelves, as well as the grounded ice streams that feed them. We present a new coupled model of an ice stream-ice shelf-ocean system that is used to study this interaction. The model is capable of representing a moving grounding line and dynamically responding ocean circulation within the ice shelf cavity. Idealized experiments designed to investigate the response of the coupled system to instantaneous increases in ocean temperature show ice-ocean system responses on multiple timescales. Melt rates and ice shelf basal slopes near the grounding line adjust in 12 years, and downstream advection of the resulting ice shelf thinning takes place on decadal timescales. Retreat of the grounding line and adjustment of grounded ice takes place on a much longer timescale, and the system takes several centuries to reach a new steady state. During this slow retreat, and in the absence of either an upward-or downward-sloping bed or long-term trends in ocean heat content, the ice shelf and melt rates maintain a characteristic pattern relative to the grounding line.
Publication Date: Jun-2012
Electronic Publication Date: 29-Jun-2012
Citation: Goldberg, DN, Little, CM, Sergienko, OV, Gnanadesikan, A, Hallberg, R, Oppenheimer, M. (2012). Investigation of land ice-ocean interaction with a fully coupled ice-ocean model: 1. Model description and behavior. Journal of Geophysical Research: Earth Surface, 117 (F2), 1 - 16. doi:10.1029/2011JF002246
DOI: doi:10.1029/2011JF002246
ISSN: 0148-0227
Pages: 1 - 16
Type of Material: Journal Article
Journal/Proceeding Title: Journal of Geophysical Research: Earth Surface
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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