Effects of calving and submarine melting on steady states and stability of buttressed marine ice sheets

Haseloff, Marianne; Sergienko, Olga V.

doi:10.1017/jog.2022.29

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

i

Effects of calving and submarine melting on steady states and stability of buttressed marine ice sheets

2022
By Haseloff, Marianne ; Sergienko, Olga V.
Source: Journal of Glaciology , First View , pp. 1 - 18

[PDF-2.20 MB]

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Journal Title:

Journal of Glaciology
Personal Author:

Haseloff, Marianne ; Sergienko, Olga V.

Haseloff, Marianne ; Sergienko, Olga V. Less -
NOAA Program & Office:

GFDL (Geophysical Fluid Dynamics Laboratory) ; OAR (Oceanic and Atmospheric Research) ; CIMES (Cooperative Institute for Modeling the Earth System)

GFDL (Geophysical Fluid Dynamics Laboratory) ; OAR (Oceanic and Atmospheric Research) ; CIMES (Cooperative Institute for Modeling the Earth System) Less -
Description:

Mass loss from ice shelves is a strong control on grounding-line dynamics. Here we investigate how calving and submarine melt parameterizations affect steady-state grounding-line positions and their stability. Our results indicate that different calving laws with the same melt parameterization result in more diverse steady-state ice-sheet configurations than different melt parameterizations with the same calving law. We show that the backstress at the grounding line depends on the integrated ice-shelf mass flux. Consequently, ice shelves are most sensitive to high melt rates in the vicinity of their grounding lines. For the same shelf-averaged melt rates, different melt parameterizations can lead to very different ice-shelf configurations and grounding-line positions. If the melt rate depends on the slope of the ice-shelf draft, then the positive feedback between increased melting and steepening of the slope can lead to singular melt rates at the ice-shelf front, producing an apparent lower limit of the shelf front thickness as the ice thickness vanishes over a small boundary layer. Our results illustrate that the evolution of marine ice sheets is highly dependent on ice-shelf mass loss mechanisms, and that existing parameterizations can lead to a wide range of modelled grounding-line behaviours.
Keywords:

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Sea ice
Source:

Journal of Glaciology , First View , pp. 1 - 18
DOI:

https://doi.org/10.1017/jog.2022.29
Document Type:

Journal Article
Funding:

Grant no. NA18OAR4320123
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CC BY
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Submitted
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urn:sha256:1f09fa5ee12dcbdf277a44914f02365aa94832f14f69e8f25e6b79b1ae24898a
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https://repository.library.noaa.gov/view/noaa/46499/noaa_46499_DS1.pdf
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Effects of calving and submarine melting on steady states and stability of buttressed marine ice sheets

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