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Regional modeling of the Shirase drainage basin, East Antarctica : full Stokes vs. shallow ice dynamics

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Title: Regional modeling of the Shirase drainage basin, East Antarctica : full Stokes vs. shallow ice dynamics
Authors: Seddik, Hakime Browse this author
Greve, Ralf Browse this author →KAKEN DB
Zwinger, Thomas Browse this author
Sugiyama, Shin Browse this author →KAKEN DB
Issue Date: 18-Sep-2017
Publisher: Copernicus Publications on behalf of the European Geosciences Union (EGU)
Journal Title: The Cryosphere
Volume: 11
Issue: 5
Start Page: 2213
End Page: 2229
Publisher DOI: 10.5194/tc-11-2213-2017
Abstract: A hierarchy of approximations of the force balance for the flow of grounded ice exists, ranging from the most sophisticated full Stokes (FS) formulation to the most simplified shallow ice approximation (SIA). Both are implemented in the ice flow model Elmer/Ice, and we compare them by applying the model to the East Antarctic Shirase drainage basin. First, we apply the control inverse method to infer the distribution of basal friction with FS. We then compare FS and SIA by simulating the flow of the drainage basin under present-day conditions and for three scenarios 100 years into the future defined by the SeaRISE (Sea-level Response to Ice Sheet Evolution) project. FS reproduces the observed flow pattern of the drainage basin well, in particular the zone of fast flow near the grounding line, while SIA generally overpredicts the surface velocities. As for the transient scenarios, the ice volume change (relative to the constantclimate control run) of the surface climate experiment is nearly the same for FS and SIA, while for the basal sliding experiment (halved basal friction), the ice volume change is 30% larger for SIA than for FS. This confirms findings of earlier studies that, in order to model ice sheet areas containing ice streams and outlet glaciers with high resolution and precision, careful consideration must be given to the choice of a suitable force balance.
Rights: http://creativecommons.org/licenses/by/3.0/
http://creativecommons.org/licenses/by/3.0/
Type: article
URI: http://hdl.handle.net/2115/67131
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: Greve Ralf

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