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Mass balance, flow and subglacial processes of a modelled Younger Dryas ice cap in Scotland

  • Nicholas R. Golledge (a1) (a2), Alun L. Hubbard (a3) and David E. Sugden (a2)

Abstract

We use an empirically validated high-resolution three-dimensional ice-sheet model to investigate the mass-balance regime, flow mechanisms and subglacial characteristics of a simulated Younger Dryas Stadial ice cap in Scotland, and compare the resulting model forecasts with geological evidence. Input data for the model are basal topography, a temperature forcing derived from GRIP δ18O fluctuations and a precipitation distribution interpolated from modern data. The model employs a positive-degree-day scheme to calculate net mass balance within a domain of 112500 km2, which, under the imposed climate, gives rise to an elongate ice cap along the axis of the western Scottish Highlands. At its maximum, the ice cap is dynamically and thermally zoned, reflecting topographic and climatic controls, respectively. In order to link these palaeoglaciological conditions to geological interpretations, we calculate the relative balance between sliding and creep within the simulated ice cap, forecast areas of the ice cap with the greatest capacity for basal erosion and predict the likely pattern of subglacial drainage. We conclude that ice flow in central areas of the ice cap is largely due to internal deformation, and is associated with geological evidence of landscape preservation. Conversely, the distribution of streamlined landforms is linked to faster-flowing ice whose velocity is predominantly the result of basal sliding. The geometry of the main ice mass focuses subglacial erosion in the mid-sections of topographic troughs, and produces glaciohydraulic gradients that favour subglacial drainage through low-order arterial routes.

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References

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Alley, R.B. 2000. The Younger Dryas cold interval as viewed from central Greenland. Quat. Sci. Rev., 19(1–5), 213226.
Atkinson, T.C., Briffa, K.R. and Coope, G.R.. 1987. Seasonal temperatures in Britain during the past 22 000 years, reconstructed using beetle remains. Nature, 325(6105), 587592.
Bahr, D.B., Pfeffer, W.T., Sassolas, C. and Meier, M.F.. 1998. Response time of glaciers as a function of size and mass balance. 1. Theory. J. Geophys. Res., 103(B5), 97779782.
Ballantyne, C.K. 1979. A sequence of Lateglacial ice-dammed lakes in East Argyll. Scot. J. Geol., 15(2), 153160.
Ballantyne, C.K. 1989. The Loch Lomond readvance on the Island of Skye, Scotland: glacier reconstruction and paleoclimatic implications. J. Quat. Sci., 4(2), 95108.
Ballantyne, C.K. 2002. The Loch Lomond Readvance on the Isle of Mull, Scotland: glacier reconstruction and palaeoclimatic implications. J. Quat. Sci., 17(8), 759771.
Bamber, J., Krabill, W., Raper, V. and Dowdeswell, J.. 2004. Anomalous recent growth of part of a large Arctic ice cap: Austfonna, Svalbard. Geophys. Res. Lett., 31(12), L12402. (10.1029/2004GL019667.)
Benn, D.I., Lowe, J.J. and Walker, M.J.C.. 1992. Glacier response to climatic change during the Loch Lomond Stadial and early Flandrian: geomorphological and palynological evidence from the Isle of Skye, Scotland. J. Quat. Sci., 7(2), 125144.
Benn, D.I., Hulton, N.R.J. and Mottram, R.H.. 2007a. ‘Calving laws’, ‘sliding laws’ and the stability of tidewater glaciers. Ann. Glaciol., 46, 123130.
Benn, D.I., Warren, C.W. and Mottram, R.H.. 2007b. Calving processes and the dynamics of calving glaciers. Earth-Sci. Rev., 82(3–4), 143179.
Bennett, M.R. and Boulton, G.S.. 1993. Deglaciation of the Younger Dryas or Loch Lomond stadial ice-field in the northern Highlands, Scotland. J. Quat. Sci., 8(2), 133145.
Boulton, G.S. 1986. Geophysics: a paradigm shift in glaciology? Nature, 322(6074), 18.
Boulton, G.S., Dobbie, K.E. and Zatsepin, S.. 2001. Sediment deformation beneath glaciers and its coupling to the subglacial hydraulic system. Quat. Int., 86(1), 328.
Brooks, S.J. and Birks, H.J.B.. 2000. Chironomid-inferred Late-glacial air temperatures at Whitrig Bog, Southeast Scotland. J. Quat. Sci., 15(8), 759764.
Brown, C.S., Meier, M.F. and Post, A.. 1982. Calving speed of Alaska tidewater glaciers, with application to Columbia Glacier. USGS Prof. Pap. 1258-C, C1C13.
Charbit, S., Ritz, C. and Ramstein, G.. 2002. Simulations of Northern Hemisphere ice-sheet retreat: sensitivity to physical mechanisms involved during the last deglaciation. Quat. Sci. Rev., 21(1–3), 243265.
Clapperton, C.M. 1997. Greenland ice cores and North Atlantic sediments: implications for the last glaciation in Scotland. In Gordon, J.E., ed. Reflections on the Ice Age in Scotland: an update on Quaternary studies. Glasgow, Scottish Association of Geography Teachers and Scottish Natural Heritage.
Clark, C.D. and 7 others. 2004. Map and GIS database of glacial landforms and features related to the last British Ice Sheet. Boreas, 33(4), 359375.
Colgan, W., Davis, J. and Sharp, M.. 2008. Is the high-elevation region of the Devon Ice Cap thickening? J. Glaciol., 54(186), 428436.
Dethloff, K. and 9 others. 2002. Recent Greenland accumulation estimated from regional climate model simulations and ice core analysis. J. Climate, 15(19), 28212832.
Dowdeswell, J.A. and 10 others. 1997. The mass balance of circum-Arctic glaciers and recent climate change. Quat. Res., 48(1), 114.
Evans, D.J.A. and Wilson, S.B.. 2006. Scottish landform example 39: the Lake of Menteith glacitectonic hill-hole pair. Scot. Geogr. J., 122(4), 352364.
Glen, J.W. 1955. The creep of polycrystalline ice. Proc. R. Soc. London, Ser. A, 228(1175), 519538.
Golledge, N.R. 2006. The Loch Lomond stadial glaciation south of Rannoch Moor: new evidence and palaeoglaciological insights. Scot. Geogr. J., 122(4), 326343.
Golledge, N.R. 2007a. An ice cap landsystem for palaeoglaciological reconstructions: characterizing the Younger Dryas in western Scotland. Quat. Sci. Rev., 26(1–2), 213229.
Golledge, N.R. 2007b. Sedimentology, stratigraphy, and glacier dynamics, western Scottish Highlands. Quat. Res., 68(1), 7995.
Golledge, N.R. and Phillips, E.. 2008. Sedimentology and architecture of De Geer moraines in the western Scottish Highlands, and implications for grounding-line glacier dynamics. Sediment. Geol., 208(1–2), 114.
Golledge, N.R., Hubbard, A. and Sugden, D.E.. 2008. High-resolution numerical simulation of Younger Dryas glaciation in Scotland. Quat. Sci. Rev., 27(9–10), 888904.
Hubbard, A. 1999. High-resolution modeling of the advance of the Younger Dryas ice sheet and its climate in Scotland. Quat. Res., 52(1), 2743.
Hubbard, A. 2000. The verification and significance of three approaches to longitudinal stresses in high-resolution models of glacier flow. Geogr. Ann., Ser. A, 82(4), 471487.
Hubbard, A. 2006. The validation and sensitivity of a model of the Icelandic ice sheet. Quat. Sci. Rev., 25(17–18), 22972313.
Hubbard, A., Hein, A.S., Kaplan, M.R., Hulton, N.R.J. and Glasser, N.. 2005. A modelling reconstruction of the Last Glacial Maximum ice sheet and its deglaciation in the vicinity of the Northern Patagonian Icefield, South America. Geogr. Ann., 87A(2), 375391.
Hubbard, A., Sugden, D., Dugmore, A.J., Norddahl, H. and Pétursson, H.G.. 2006. A modelling insight into the Icelandic Last Glacial Maximum ice sheet. Quat. Sci. Rev., 25(17–18), 22832296.
Jamieson, S.S.R., Hulton, N.R.J. and Hagdorn, M.. 2008. Modelling landscape evolution under ice sheets. Geomorphology, 97(1–2), 91108.
Johnsen, S.J., Dahl-Jensen, D., Dansgaard, W. and Gundestrup, N.S.. 1995. Greenland paleotemperatures derived from GRIP borehole temperature and ice core isotope profiles. Tellus, 47B(5), 624629.
Johnsen, S.J. and 8 others. 2001. Oxygen isotope and palaeo-temperature records from six Greenland ice-core stations: Camp Century, Dye-3, GRIP, GISP2, Renland and NorthGRIP. J. Quat. Sci., 16(4), 299307.
Kamb, B. 1987. Glacier surge mechanism based on linked cavity configuration of the basal water conduit system. J. Geophys. Res., 92(B9), 90839100.
Kjær, K.H. and 7 others. 2006. Subglacial decoupling at the sediment/bedrock interface: a new mechanism for rapid flowing ice. Quat. Sci. Rev., 25(21–22), 27042712.
Knight, J.. 2003. Evaluating controls on ice dynamics in the northeast Atlantic using an event stratigraphy approach. Quat. Int., 99–100, 4557.
Kroon, D., Austin, W.E.N., Chapman, M.R. and Ganssen, G.M.. 1997. Deglacial surface circulation changes in the northeastern Atlantic: temperature and salinity records off NW Scotland on a century scale. Paleoceanography, 12(6), 755763.
Laumann, T. and Reeh, N.. 1993. Sensitivity to climate change of the mass balance of glaciers in southern Norway. J. Glaciol., 39(133), 656665.
MacAyeal, D.R. 1993. Binge/purge oscillations of the Laurentide ice sheet as a cause of the North Atlantic’s Heinrich events. Paleoceanography, 8(6), 775784.
Mangerud, J. 1991. The last interglacial/glacial cycle in Northern Europe. In Shane, L.C.K. and Cushing, E., eds. Quaternary Landscapes. Minneapolis, University of Minnesota Press, 3875.
Murray, T. and 6 others. 2000. Glacier surge propagation by thermal evolution at the bed. J. Geophys. Res., 105(B6), 13,49113,507.
Paterson, W.S.B. 1994. The physics of glaciers. Third edition. Oxford, etc., Elsevier.
Payne, A.J. and Sugden, D.E.. 1990. Topography and ice sheet dynamics. Earth Surf. Process. Landf., 15(7), 625639.
Peacock, J.D., Graham, D.K., Robinson, J.E. and Wilkinson, I.P.. 1977. Evolution and chronology of Lateglacial marine environments at Lochgilphead, Scotland. In Gray, J.M. and Lowe, J.J., eds. Studies in the Scottish Lateglacial environment. Oxford, Pergamon.
Perry, M. and Hollis, D.. 2005. The generation of monthly gridded datasets for a range of climatic variables over the UK. Int. J. Climatol., 25(8), 10231148.
Pfeffer, W.T., Sassolas, C., Bahr, D.B. and Meier, M.F.. 1998. Response time of glaciers as a function of size and mass balance: II. Numerical experiments. J. Geophys. Res., 103(B5), 97839789.
Piotrowski, J.A., Mickelson, D.M., Tulaczyk, S., Krzyszkowski, D. and Junge, F.W.. 2001. Were deforming subglacial beds beneath past ice sheets really widespread? Quat. Int., 86(1), 139150.
Piotrowski, J.A., Mickelson, D.M., Tulaczyk, S., Krzyszkowski, D. and Junge, F.W.. 2002. Reply to the comments by G.S. Boulton, K.E. Dobbie, S. Zatsepin on: deforming soft beds under ice sheets: how extensive were they? Quat. Int., 97–98, 173177.
Piotrowski, J.A., Larsen, N.K. and Junge, F.W.. 2004. Reflections on soft subglacial beds as a mosaic of deforming and stable spots. Quat. Sci. Rev., 23(9–10), 9931000.
Rabus, B.T. and Echelmeyer, K.A.. 1998. The mass balance of McCall Glacier, Brooks Range, Alaska, U.S.A.; its regional relevance and implications for climate change in the Arctic. J. Glaciol., 44(147), 333351.
Shennan, I. and 6 others. 1998. Sea level, climate change and coastal evolution in Morar, northwest Scotland. Geol. Mijnbouw, 77(3–4), 247262.
Siegert, M.J. and Dowdeswell, J.A.. 2004. Numerical reconstructions of the Eurasian Ice Sheet and climate during the Late Weichselian. Quat. Sci. Rev., 23(11–13), 12731283.
Sissons, J.B. 1967. The evolution of Scotland’s scenery. Edinburgh, Oliver & Boyd.
Sissons, J.B. 1979. The Loch Lomond stadial in the British Isles. Nature, 280(5719), 199203.
Strahler, A.N. 1952. Dynamic basis of geomorphology. Geol. Soc. Am. Bull., 63(9), 923938.
Sutherland, D.G. 1984. The Quaternary deposits and landforms of Scotland and the neighbouring shelves: a review. Quat. Sci. Rev., 3(2–3), 157254.
Thorp, P.W. 1986. A mountain icefield of Loch Lomond stadial age, western Grampians, Scotland. Boreas, 15(1), 8397.
Thorp, P.W. 1991. Surface profiles and basal shear stresses of outlet glaciers from a Late-glacial mountain ice field in western Scotland. J. Glaciol., 37(125), 7788.
Trabant, D.C. and Mayo, L.R.. 1985. Estimation and effects of internal accumulation on five glaciers in Alaska. Ann. Glaciol., 6, 113117.
Van der Veen, C.J. 1999. Fundamentals of glacier dynamics. Rotterdam, A.A. Balkema.
Zweck, C. and Huybrechts, P.. 2003. Modeling the marine extent of Northern Hemisphere ice sheets during the last glacial cycle. Ann. Glaciol., 37, 173180.

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