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Modelling the Antarctic marine cryosphere at the Last Glacial Maximum

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Title: Modelling the Antarctic marine cryosphere at the Last Glacial Maximum
Authors: Kusahara, Kazuya Browse this author
Sato, Tatsuru Browse this author
Oka, Akira Browse this author
Obase, Takashi Browse this author
Greve, Ralf Browse this author →KAKEN DB
Abe-Ouchi, Ayako Browse this author
Hasumi, Hiroyasu Browse this author
Keywords: climate change
ice shelves
ice/ocean interactions
sea-ice modelling
Issue Date: 1-Oct-2015
Publisher: International Glaciological Society
Journal Title: Annals of Glaciology
Volume: 56
Issue: 69
Start Page: 425
End Page: 435
Publisher DOI: 10.3189/2015AoG69A792
Abstract: We estimate the sea-ice extent and basal melt of Antarctic ice shelves at the Last Glacial Maximum (LGM) using a coupled ice-shelf–sea-ice–ocean model. The shape of Antarctic ice shelves, ocean conditions and atmospheric surface conditions at the LGM are different from those in the present day; these are derived from an ice-shelf–ice-sheet model, a sea-ice–ocean model and a climate model for glacial simulations, respectively. The winter sea ice in the LGM is shown to extend up to ~7° of latitude further equatorward than in the present day. For the LGM summer, the model shows extensive sea-ice cover in the Atlantic sector and little sea ice in the other sectors. These modelled sea-ice features are consistent with those reconstructed from sea-floor sedimentary records. Total basal melt of Antarctic ice shelves in the LGM was ~2147 Gt a–1, which is much larger than the present-day value. More warm waters originating from Circumpolar Deep Water could be easily transported into ice-shelf cavities during the LGM because the full glacial grounding line extended to shelf break regions and ice shelves overhung continental slopes. This increased transport of warm water masses underneath an ice shelf and into their basal cavities led to the high basal melt of ice shelves in the LGM.
Rights: © 2015 International Glaciological Society
Type: article
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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