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An East Siberian ice shelf during the Late Pleistocene glaciations: Numerical reconstructions
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för naturgeografi.
Vise andre og tillknytning
Rekke forfattare: 52016 (engelsk)Inngår i: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 147, nr SI, s. 148-163Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A recent data campaign in the East Siberian Sea has revealed evidence of grounded and floating ice dynamics in regions of up to 1000 m water depth, and which are attributed to glaciations older than the Last Glacial Maximum (21 kyrs BP). The main hypothesis based on this evidence is that a small ice cap developed over Beringia and expanded over the East Siberian continental margin during some of the Late Pleistocene glaciations. Other similar evidence of ice dynamics that have been previously collected on the shallow continental shelves of the Arctic Ocean have been attributed to the penultimate glaciation, i.e. Marine Isotopes Stage 6 (approximate to 140 kyrs BP). We use an ice sheet model, forced by two previously simulated MIS 6 glacial maximum climates, to carry out a series of sensitivity experiments testing the impact of dynamics and mass-balance related parameters on the geometry of the East Siberian ice cap and ice shelf. Results show that the ice cap developing over Beringia connects to the Eurasian ice sheet in all simulations and that its volume ranges between 6 and 14 m SLE, depending on the climate forcing. This ice cap generates an ice shelf of dimensions comparable with or larger than the present-day Ross ice shelf in West Antarctica. Although the ice shelf extent strongly depends on the ice flux through the grounding line, it is particularly sensitive to the choice of the calving and basal melting parameters. Finally, inhibiting a merging of the Beringia ice cap with the Eurasian ice sheet affects the expansion of the ice shelf only in the simulations where the ice cap fluxes are not large enough to compensate for the fluxes coming from the Eurasian ice sheet.

sted, utgiver, år, opplag, sider
2016. Vol. 147, nr SI, s. 148-163
Emneord [en]
Late Pleistocene glaciations, Arctic ocean, East Siberian ice shelf, Ice sheet model, Glacial climate
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-134395DOI: 10.1016/j.quascirev.2015.12.023ISI: 000382409500010OAI: oai:DiVA.org:su-134395DiVA, id: diva2:1040029
Konferanse
2nd International Conference of the Palaeo-Arctic-Spatial-and-Temporal-Gateways-Network (PAST Gateways), Trieste, Italy, 2014
Tilgjengelig fra: 2016-10-26 Laget: 2016-10-06 Sist oppdatert: 2017-11-29bibliografisk kontrollert

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