Skip to main content Accessibility help
×
Home

Isostatic uplift in the late Weichselian Barents Sea: implications for ice-sheet growth

  • M. J. Siegert (a1) and W. Fjeldskaar (a2)

Abstract

Results from a recent time-dependent ice-sheet modelling study of the late Weichselian Svalbard—Barents Sea ice sheet suggest that, under environmental conditions representative of those during the late Weichselian, ice derived solely from Svalbard may have occupied only the relatively shallow (<300 m water depth) northwestern Barents Sea, with other deeper regions remaining free of grounded ice (Siegert and Dowdeswell, 1995a). However, late Weichselian geological information from the 400 m deep Bjørnøyrenna (southern Barents Sea) indicates that grounded ice was present in an area modelled by Siegert and Dowdeswell (1995a) as free of ice (e.g. Laberg and Vorren, in press a). Isostatic uplift of the central Barents Sea may have reduced the relative sea level and hence provided a mechanism by which grounded ice could have migrated from relatively shallow regions of the Barents Sea into, previous to uplift, deeper water. We have used an isostatic Earth model to determine the geometry of an isostatic forebulge within the late Weichselian Barents Sea, caused by ice loads over Svalbard, Franz Josef Land, Novaya Zemlya and Fennoscandia. These data were then used as input to a time-dependent glaciological model, in order to predict further information about the magnitude of bedrock uplift required to allow grounded ice to flow from Svalbard into the central and southern Barents Sea. Our experiments suggest that grounded ice, originating from Svalbard, is able to form over Sentralbanken, providing that at least 60 m of uplift is achieved in the central Barents Sea. Grounded ice within Bjørnøyrenna was only predicted when the amplitude of the local forebulge exceeded 250 m.

  • View HTML
    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Isostatic uplift in the late Weichselian Barents Sea: implications for ice-sheet growth
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Isostatic uplift in the late Weichselian Barents Sea: implications for ice-sheet growth
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Isostatic uplift in the late Weichselian Barents Sea: implications for ice-sheet growth
      Available formats
      ×

Copyright

References

Hide All
Budd, W. F., Jenssen, D. and Smith, I. N.. 1984. A three-dimensional time-dependent model of the West Antarctic ice sheet. Ann. Glaciol., 5, 2936.
Cathles, L. 1975. The viscosity of the Earth’s mantle. Princeton, NJ, Princeton University Press.
Denton, G. H. and Hughes, T. J., 1981. The Arctic ice sheet: an outrageous hypothesis. In Denton, G. H. and Hughes, T. J., eds. The last great ice sheets. New York, John Wiley and Sons, 437467.
Elverhoi, A. and Solheim, A.. 1983. The Barents Sea ice sheet — a sedimentological discussion. Polar Res., 1(1), 2342.
Elverhoi, A., Fjeldskaar, W., Solheim, A., M. Nyland-Berg and Russwurm, L., 1993. The Barents Sea ice sheet — a model of its growth and decay during the last ice maximum, Quat. Sci. Rev., 12(10), 863873.
Fairbanks, R. G. 1989. A 17,000-year giacio-eustatic sea level record: influence of glacial melting rates on the Younger Dryas event and deep-ocean circulation. Nature, 342(6250), 637642.
Fjeldskaar, W. and Cathles, L.. 1991. Rheology of mantle and lithosphere inferred from postglacial uplift in Fennoscandia. In Sabadini, R., Lambeck, K. and Boschi, E., eds. Glacial isotacy, sea-level and mantle rheology. Dordrecht, etc., Kluwer Academic Publishers, 1–19. (NATO ASI Series C: Mathematical and Physical Sciences 334.)
Fortuin, J. P. F. and Oerlemans, J.. 1990. Parameterization of the annual surface temperature and mass balance of Antarctica. Ann. Glaciol., 14, 7884.
Grosswald, M. G. 1988. An Antarctic-style ice sheet in the Northern Hemisphere; toward a new global glacial theory. Polar Geogr. Cent., 12(4), 239267.
Hebbeln, D., T. Dokken. Andersen, K. S., Hald, M. and Elverhoi, A.. 1994. Moisture supply for northern ice-sheet growth during me Last Glacial Maximum. Nature, 370(6488), 357360.
Kvasov, D. D. and Blazhchishin, A. I.. 1978. The key to sources of Pliocene and Pleistocene glaciation is at the bottom of the Barents Sea. Nature, 273(5658), 138140.
Laberg, J. S. and Vorren, T. O., In press a. Late Pleistocene evolution of the Bear Island Trough Mouth Fan. Global and Planetary Change, 12.
Laberg, J. S. and Vorren, T. O.. In press b. Late Weichselian submarine debris flow deposits on the Bear Island Trough Mouth Fan. Mar. Geol.
Lindstrom, D. R. and MacAyeal, D. R.. 1989. Scandinavian, Siberian and Arctic Ocean glaciation: effect of Holocene atmospheric C02 variations. Science, 245(4918), 628631.
Mahaffy, M. W. 1976. A three-dimensional numerical model of ice sheets: tests on the Barnes Ice Cap, Northwest Territories, J. Geophys. Res., 81(6), 10591066.
Manabe, S. and Bryan, K.. Jr. 1985. CO2-induced change in a coupled ocean atmosphere model and its paleoclimatic implications. J. Geophys. Res., 90, 11,689–11,707.
Mangerud, J. and Svendsen, J. I.. 1992. Last interglacial glacial period on Spitsbergen, Svalbard. Quat. Sci. Rev., 11(6), 633664.
Oerlemans, J. and C. J. van der Veen, eds. 1984. Ice sheets and climate. Dordrecht, etc., D. Reidel Publishing Company.
Paterson, W. S. B. 1994. The physics of glaciers. Third edition. Oxford, etc., Elsevier Science Ltd.
Pelto, M. S. and Warren, C. R.. 1991. Relationship between tidewater glacier calving velocity and water depth at the calving front. Ann. Glaciol., 15, 115118.
Pelto, M. S., Higgins, S. M., Hughes, T. J. and J. L, Fastook, 1990. Modeling mass-balance changes during a glaciation cycle. Ann. Glaciol., 14, 238241.
Robin, G. de Q. 1955. Ice movement and temperature distribution in glaciers and ice sheets. J. Glaciol., 2(18), 523532.
Sættem, J., Poole, D. A. R., L, Ellingsen and Sejrup, H. P.. 1992. Glacial geology of outer Bjørnøyrenna, southwestern Barents Sea. Mar. Geol., 103(1–3), 1551.
Siegert, M. J. and Dowdeswell, J. A., 1995a. Modelling ice-sheet sensitivity to Late Weichselian environments in the Svalbard–Barents Sea region. J. Quat. Sci., 10, 3343.
Siegert, M. J. and Dowdeswell, J. A.. 1995b. Numerical modelling of the Late Weichselian Svalbard Barents Sea ice sheet. Quat. Res., 43(1), 113.
Siegert, M. J. and Dowdeswell, J. A.. In press. Topographic control on the dynamics of the Svalbard Barents Sea ice sheet. Global and Planetary Change, 12.
Vorren, T. O. and Kristoffersen, Y.. 1986. Late Quaternary glaciation in the south-western Barents Sea. Boreas, 15(1), 5159.
Vorren, T. O., Hald, M. and Lebesbye, E.. 1988. Late Cenozoic environments in the Barents Sea. Paleoceanography, 3(5), 601612.

Isostatic uplift in the late Weichselian Barents Sea: implications for ice-sheet growth

  • M. J. Siegert (a1) and W. Fjeldskaar (a2)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed