The last Welsh Ice Cap: Part 2 - Dynamics of a topographically controlled icecap

Boreas

Volumn 42, Issue 3, 2013, Pages 491-510

  Patton, Henry ^a   Hubbard, Alun ^a   Glasser, Neil F ^a   Bradwell, Tom ^b   Golledge, Nicholas R ^c  

^a ABERYSTWYTH UNIVERSITY   (United Kingdom)

^b BRITISH GEOLOGICAL SURVEY   (United Kingdom)

^c VICTORIA UNIVERSITY OF WELLINGTON   (New Zealand)

Author keywords

[No Author keywords available]

Indexed keywords

GEOACCUMULATION; GEOLOGICAL RECORD; GEOMORPHOLOGY; ICE CAP; ICE MECHANICS; ICE SHEET; ICE THICKNESS; LAST GLACIAL MAXIMUM; RECONSTRUCTION; TOPOGRAPHIC EFFECT; YOUNGER DRYAS;

UNITED KINGDOM; WALES;

BOREAS;

EID: 84879556209     PISSN: 03009483     EISSN: 15023885     Source Type: Journal    
DOI: 10.1111/j.1502-3885.2012.00301.x     Document Type: Article

References (103)

1. A{eth}algeirsdóttir, G. T., Gudmundsson, G. H. & Björnsson, H. 2005: Volume sensitivity of Vatnajökull Ice Cap, Iceland, to perturbations in equilibrium line altitude. Journal of Geophysical Research 110, F04001, doi: 10.1029/2005jf000289.
2. Addison, K. 1978: Magnificent Nant Ffrancon on the Holyhead road. Geographical Magazine 40, 315-319.
3. Addison, K. 1990: Introduction to the Quaternary in North Wales. In Addison, K., Edge, M. J. & Watkin, R. (eds): The Quaternary of North Wales: Field Guide, 1-19. Quaternary Research Association, Coventry, UK.
4. Alley, R. B., Blankenship, D. D., Bentley, C. R. & Rooney, S. T. 1986: Deformation of till beneath ice stream B, West Antarctica. Nature 322, 57-59.
5. Alley, R. B., Cuffey, K. M., Evenson, E. B., Strasser, J. C., Lawson, D. E. & Larson, G. J. 1997: How glaciers entrain and transport basal sediment: physical constraints. Quaternary Science Reviews 16, 1017-1038.
6. Amundson, J. M. & Iverson, N. R. 2006: Testing a glacial erosion rule using hang heights of hanging valleys, Jasper National Park, Alberta, Canada. Journal of Geophysical Research 111, F01020, doi: 10.1029/2005JF000359.
7. Anderson, R. S., Molnar, P. & Kessler, M. A. 2006: Features of glacial valley profiles simply explained. Journal of Geophysical Research 111, F01004, doi: 10.1029/2005jf000344.
8. Arnold, N. & Sharp, M. 2002: Flow variability in the Scandinavian ice sheet: modelling the coupling between ice sheet flow and hydrology. Quaternary Science Reviews 21, 485-502.
9. Ballantyne, C. K. 2010: Extent and deglacial chronology of the last British-Irish Ice Sheet: implications of exposure dating using cosmogenic isotopes. Journal of Quaternary Science 25, 515-534.
10. Bendle, J. M. & Glasser, N. F. 2012: Palaeoclimatic reconstruction from Lateglacial (Younger Dryas Chronozone) cirque glaciers in Snowdonia, North Wales. Proceedings of the Geologists' Association 123, 130-145.
11. Boulton, G. S. & Hagdorn, M. 2006: Glaciology of the British Isles Ice Sheet during the last glacial cycle: form, flow, streams and lobes. Quaternary Science Reviews 25, 3359-3390.
12. Bowen, D. Q. 1970: South-east and central South Wales. In Lewis, C. A. (ed.): The Glaciations of Wales and Adjoining Regions, 197-228. Longman, London.
13. Bowen, D. Q. 1981: The 'South Wales end-moraine': fifty years after. In Neale, J. & Flenley, J. (eds): The Quaternary of Britain, 60-67. Pergamon Press, Oxford.
14. Bowen, D. Q. & Gregory, K. J. 1965: A glacial drainage system near Fishguard, Pembrokeshire. Proceedings of the Geologists' Association 76, 275-281.
15. Bowen, D. Q., Phillips, F. M., McCabe, A. M., Knutz, P. C. & Sykes, G. A. 2002: New data for the Last Glacial Maximum in Great Britain and Ireland. Quaternary Science Reviews 21, 89-101.
16. Bradwell, T., Stoker, M. & Krabbendam, M. 2008: Megagrooves and streamlined bedrock in NW Scotland: the role of ice streams in landscape evolution. Geomorphology 97, 135-156.
17. British Geological Survey 2008: EW210 Fishguard. British Geological Survey, Keyworth.
18. Campbell, S. & Bowen, D. Q. 1989: Geological Conservation Review: Quaternary of Wales. Nature Conservancy Council, Peterborough.
19. Carr, S. 2001: A glaciological approach for the discrimination of Loch Lomond Stadial glacial landforms in the Brecon Beacons, South Wales. Proceedings of the Geologists' Association 112, 253-262.
20. Charlesworth, J. K. 1929: The South Wales end-moraine. Quarterly Journal of the Geological Society, London 85, 335-358.
21. Chiverrell, R. C. & Thomas, G. S. P. 2010: Extent and timing of the Last Glacial Maximum (LGM) in Britain and Ireland: a review. Journal of Quaternary Science 25, 535-549.
22. Clark, C. D. & Meehan, R. T. 2001: Subglacial bedform geomorphology of the Irish Ice Sheet reveals major configuration changes during growth and decay. Journal of Quaternary Science 16, 483-496.
23. Clark, C. D., Evans, D. J. A., Khatwa, A., Bradwell, T., Jordan, C. J., Marsh, S. H., Mitchell, W. A. & Bateman, M. D. 2004: Map and GIS database of glacial landforms and features related to the last British Ice Sheet. Boreas 33, 359-375.
24. Clark, C. D., Knight, J. K. & Gray, T. J. 2000: Geomorphological reconstruction of the Labrador Sector of the Laurentide Ice Sheet. Quaternary Science Reviews 19, 1343-1366.
25. Echelmeyer, K. & Harrison, W. D. 1990: Jakobshavns Isbrae, West Greenland - seasonal-variations in velocity or lack thereof. Journal of Glaciology 36, 82-88.
26. Egholm, D. L., Nielsen, S. B., Pedersen, V. K. & Lesemann, J. E. 2009: Glacial effects limiting mountain height. Nature 460, 884.
27. Embleton, C. 1970: North-eastern Wales. In Lewis, C. A. (ed.): The Glaciations of Wales and Adjoining Regions, 59-82. Longman, London.
28. Foster, H. D. 1970: Sarn Badrig, a submarine moraine in Cardigan Bay, north Wales. Zeitschrift für Geomorphologie 14, 473-486.
29. Garrard, R. A. & Dobson, M. R. 1974: The nature and maximum extent of glacial sediments off the west coast of Wales. Marine Geology 16, 31-44.
30. Gemmell, C., Smart, D. & Sugden, D. 1986: Striae and former ice-flow directions in Snowdonia, North Wales. The Geographical Journal 152, 19-29.
31. Glasser, N. F., Hambrey, M. J., Huddart, D., Gonzalez, S., Crawford, K. R. & Maltman, A. J. 2001: Terrestrial glacial sedimentation on the eastern margin of the Irish Sea basin: Thurstaston, Wirral. Proceedings of the Geologists' Association 112, 131-146.
32. 26Al exposure-age dating of bedrock surfaces on the Aran Ridge, Wales: evidence for a thick Welsh Ice Cap at the last glacial maximum. Journal of Quaternary Science 27, 97-104.
33. Golledge, N., Hubbard, A. & Sugden, D. 2009: Mass balance, flow and subglacial processes of a modelled Younger Dryas ice cap in Scotland. Journal of Glaciology 55, 32-42.
34. Gray, J. M. 1982: The last glaciers (Loch Lomond Advance) in Snowdonia, N. Wales. Geological Journal 17, 111-133.
35. Gudmundsson, G. H. 2003: Transmission of basal variability to a glacier surface. Journal of Geophysical Research 108, 2253, doi: 10.1029/2002jb002107.
36. Hallet, B. 1979: A theoretical model of glacial abrasion. Journal of Glaciology 23, 39-50.
37. Hallet, B. 1981: Glacial abrasion and sliding: their dependence on the debris in basal ice. Annals of Glaciology 2, 23-28.
38. Hallet, B. 1996: Glacial quarrying: a simple theoretical model. Annals of Glaciology 22, 1-8.
39. Hambrey, M. J., Davies, J. R., Glasser, N. F., Waters, R. A., Dowdeswell, J. A., Wilby, P. R., Wilson, D. & Etienne, J. L. 2001: Devensian glacigenic sedimentation and landscape evolution in the Cardigan area of southwest Wales. Journal of Quaternary Science 16, 455-482.
40. Harbor, J. M., Hallet, B. & Raymond, C. F. 1988: A numerical model of landform development by glacial erosion. Nature 333, 347-349.
41. Harrison, W. D., Echelmeyer, K. A. & Larsen, C. F. 1998: Measurement of temperature in a margin of Ice Stream B, Antarctica: implications for margin migration and lateral drag. Journal of Glaciology 44, 615-624.
42. Herman, F. & Braun, J. 2008: Evolution of the glacial landscape of the Southern Alps of New Zealand: insights from a glacial erosion model. Journal of Geophysical Research 113, F02009, doi: 10.1029/2007jf000807.
43. Herman, F., Beaud, F., Champagnac, J. D., Lemieux, J. M. & Sternai, P. 2011: Glacial hydrology and erosion patterns: a mechanism for carving glacial valleys. Earth and Planetary Science Letters 310, 498-508.
44. Hildes, D. H. D., Clarke, G. K. C., Flowers, G. E. & Marshall, S. J. 2004: Subglacial erosion and englacial sediment transport modelled for North American ice sheets. Quaternary Science Reviews 23, 409-430.
45. Hubbard, A. 2006: The validation and sensitivity of a model of the Icelandic ice sheet. Quaternary Science Reviews 25, 2297-2313.
46. Hubbard, A., Bradwell, T., Golledge, N., Hall, A., Patton, H., Sugden, D., Cooper, R. & Stoker, M. 2009: Dynamic cycles, ice streams and their impact on the extent, chronology and deglaciation of the British-Irish ice sheet. Quaternary Science Reviews 28, 758-776.
47. Hughes, P. D. 2002: Loch Lomond Stadial glaciers in the Aran and Arenig Mountains, North Wales, Great Britain. Geological Journal 37, 9-15.
48. Hughes, P. D. 2009: Loch Lomond Stadial (Younger Dryas) glaciers and climate in Wales. Geological Journal 44, 375-391.
49. Hulbe, C. L. & MacAyeal, D. R. 1999: A new numerical model of coupled inland ice sheet, ice stream, and ice shelf flow and its application to the West Antarctic Ice Sheet. Journal of Geophysical Research 104, 25349-25366.
50. Jackson, M. & Kamb, B. 1997: The marginal shear stress of Ice Stream B, West Antarctica. Journal of Glaciology 43, 415-426.
51. Jansson, K. N. & Glasser, N. F. 2005a: Palaeoglaciology of the Welsh sector of the British-Irish Ice Sheet. Journal of the Geological Society 162, 25-37.
52. Jansson, K. N. & Glasser, N. F. 2005b: Using Landsat 7 ETM+ imagery and Digital Terrain Models for mapping glacial lineaments on former ice sheet beds. International Journal of Remote Sensing 26, 3931-3941.
53. Jansson, K. N. & Glasser, N. F. 2008: Modification of peripheral mountain ranges by former ice sheets: the Brecon Beacons, Southern UK. Geomorphology 97, 178-189.
54. John, B. S. 1970: Pembrokeshire. In Lewis, C. A. (ed.): The Glaciations of Wales and Adjoining Regions, 229-265. Longman, London.
55. John, B. S. 1981: Presely Hills (Pembrokeshire Coast National Park Area Guide). 32 pp. Greencroft Books, Newport, UK.
56. Jones, O. T. 1965: Glacial and post glacial history of the lower Teifi valley. Quarterly Journal of the Geological Society 121, 247-281.
57. Kleman, J. 1994: Preservation of landforms under ice sheets and ice caps. Geomorphology 9, 19-32.
58. Kleman, J. & Borgström, I. 1996: Reconstruction of palaeo-ice sheets: the use of geomorphological data. Earth Surface Processes and Landforms 21, 893-909.
59. Kleman, J., Hättestrand, C., Borgström, I. & Stroeven, A. 1997: Fennoscandian palaeoglaciology reconstructed using a glacial geological inversion model. Journal of Glaciology 43, 283-299.
60. Lambeck, K. 1996: Glaciation and sea-level change for Ireland and the Irish Sea since Late Devensian/Midlandian time. Journal of the Geological Society 153, 853-872.
61. Le Meur, E. & Vincent, C. 2003: A two-dimensional shallow ice-flow model of Glacier de Saint-Sorlin, France. Journal of Glaciology 49, 527-538.
62. Le Meur, E., Gagliardini, O., Zwinger, T. & Ruokolainen, J. 2004: Glacier flow modelling: a comparison of the Shallow Ice Approximation and the full-Stokes solution. Comptes Rendus Physique 5, 709-722.
63. Lewis, C. A. & Thomas, G. S. P. 2005: The upper Wye and Usk regions. In Lewis, C. A. & Richards, A. E. (eds.): The Glaciations of Wales and Adjacent Areas, 101-128. Logaston Press, Logaston, UK.
64. Leysinger Vieli, G. J.-M. C. & Gudmundsson, G. H. 2004: On estimating length fluctuations of glaciers caused by changes in climatic forcing. Journal of Geophysical Research 109, F01007, doi: 10.1029/2003jf000027.
65. Lowe, S. 1994: The Devensian Lateglacial and Early Flandrian stratigraphy of southern Snowdonia, North Wales. Ph.D thesis. Queen Mary, University of London, London, 259 pp.
66. MacGregor, K. R., Anderson, R. S., Anderson, S. P. & Waddington, E. D. 2000: Numerical simulations of glacial-valley longitudinal profile evolution. Geology 28, 1031-1034.
67. Marshall, S. J., Tarasov, L., Clarke, G. K. C. & Peltier, W. R. 2000: Glaciological reconstruction of the Laurentide Ice Sheet: physical processes and modelling challenges. Canadian Journal of Earth Sciences 37, 769-793.
68. McCarroll, D. & Ballantyne, C. K. 2000: The last ice sheet in Snowdonia. Journal of Quaternary Science 15, 765-778.
69. McCarroll, D., Stone, J. O., Ballantyne, C. K., Scourse, J. D., Fifield, L. K., Evans, D. J. A. & Hiemstra, J. F. 2010: Exposure-age constraints on the extent, timing and rate of retreat of the last Irish Sea ice stream. Quaternary Science Reviews 29, 1844-1852.
70. Murray, T. 1997: Assessing the paradigm shift: deformable glacier beds. Quaternary Science Reviews 16, 995-1016.
71. Nye, J. F. 1952: The mechanics of glacier flow. Journal of Glaciology 2, 82-93.
72. Ó Cofaigh, C. & Evans, D. J. A. 2007: Radiocarbon constraints on the age of the maximum advance of the British-Irish Ice Sheet in the Celtic Sea. Quaternary Science Reviews 26, 1197-1203.
73. Oerlemans, J. 1984: Numerical experiments on glacial erosion. Zeitschrift für Gletscherkunde und Glazialgeologie 20, 107-126.
74. Patton, H. & Hambrey, M. J. 2009: Ice-marginal sedimentation associated with the Late Devensian Welsh Ice Cap and the Irish Sea Ice Stream: Tonfanau, West Wales. Proceedings of the Geologists' Association 120, 256-274.
75. Patton, H., Hubbard, A., Glasser, N. F., Bradwell, T. & Golledge, N. R. 2012: The last Welsh Ice Cap: Part 1 - Modelling its evolution, sensitivity and associated climate. Boreas, doi: 10.1111/j.1502-3885.2012.00300.x.
76. Pattyn, F. 2002: Transient glacier response with a higher-order numerical ice-flow model. Journal of Glaciology 48, 467-477.
77. Payne, A. J. 1999: A thermomechanical model of ice flow in West Antarctica. Climate Dynamics 15, 115-125.
78. Phillips, F. M., Bowen, D. Q. & Elmore, D. 1994: Surface exposure dating of glacial features in Great Britain using cosmogenic chlorine-36. Mineralogists' Magazine 58A, 722-723.
79. Pimentel, S., Flowers, G. E. & Schoof, C. G. 2010: A hydrologically coupled higher-order flow-band model of ice dynamics with a Coulomb friction sliding law. Journal of Geophysical Research 115, F04023, doi: 10.1029/2009jf001621.
80. Rea, B. R. & Evans, D. J. A. 2007: Quantifying climate and glacier mass balance in north Norway during the Younger Dryas. Palaeogeography, Palaeoclimatology, Palaeoecology 246, 307-330.
81. Richards, A. E. 2005: Herefordshire. In Lewis, C. A. & Richards, A. E. (eds.): The Glaciations of Wales and Adjacent Areas, 129-144. Logaston Press, Logaston, UK.
82. Rippin, D. M., Bamber, J. L., Siegert, M. J., Vaughan, D. G. & Corr, H. F. J. 2004: The role of ice thickness and bed properties on the dynamics of the enhanced-flow tributaries of Bailey Ice Stream and Slessor Glacier, East Antarctica. Annals of Glaciology 39, 366-372.
83. Roberts, D. H. & Long, A. J. 2005: Streamlined bedrock terrain and fast ice flow, Jakobshavns Isbrae, West Greenland: implications for ice stream and ice sheet dynamics. Boreas 34, 25-42.
84. Ross, N., Harris, C., Brabham, P. J. & Sheppard, T. H. 2011: Internal structure and geological context of ramparted depressions, llanpumsaint, Wales. Permafrost and Periglacial Processes 22, 291-305.
85. Rutt, I. C., Hagdorn, M., Hulton, N. R. J. & Payne, A. J. 2009: The Glimmer community ice sheet model. Journal of Geophysical Research 114, F02004. doi: 10.1029/2008jf001015.
86. Sahlin, E. A. U., Glasser, N. F., Jansson, K. N. & Hambrey, M. J. 2009: Connectivity analyses of valley patterns indicate preservation of a preglacial fluvial valley system in the Dyfi basin, Wales. Proceedings of the Geologists' Association 120, 245-255.
87. Seddon, B. 1957: Late-glacial cwm glaciers in Wales. Journal of Glaciology 3, 94-99.
88. Shakesby, R. A. 2002: Classic Landforms of the Brecon Beacons. 48 pp. Geographical Association, Sheffield, UK.
89. Shakesby, R. A. & Matthews, J. A. 1993: Loch Lomond stadial glacier at Fan Hir, Mynydd Du (Brecon Beacons), South Wales: critical evidence and palaeoclimatic implications. Geological Journal 28, 69-79.
90. Shakesby, R. A. & Matthews, J. A. 1996: Glacial activity and paraglacial landsliding in the Devensian Lateglacial: evidence from Craig Cerrig-gleisiad and Fan Dringarth, Fforest Fawr (Brecon Beacons), South Wales. Geological Journal 31, 143-157.
91. Shakesby, R. A. & Matthews, J. A. 2009: Comments on Jansson, K.N. and Glasser, N.F. (2008) 'Modification of peripheral mountain ranges by former ice sheets: the Brecon Beacons, southern UK, ' Geomorphology 97, 178-189. Geomorphology 110, 217-225.
92. Sugden, D. & John, B. S. 1976: Glaciers and Landscape. 376 pp. Arnold, London.
93. Thomas, G. S. & Chiverrell, R. C. 2007: Structural and depositional evidence for repeated ice-marginal oscillation along the eastern margin of the Late Devensian Irish Sea Ice Stream. Quaternary Science Reviews 26, 2375-2405.
94. Thomas, G. S. P. 1989: The Late Devensian glaciation along the western margin of the Cheshire-Shropshire lowland. Journal of Quaternary Science 4, 167-181.
95. Thomas, G. S. P. 2005: North-east Wales. In Lewis, C. A. & Richards, A. E. (eds): The Glaciations of Wales and Adjacent Areas, 41-58. Logaston Press, Logaston, UK.
96. Thomas, G. S. P., Chester, D. K. & Crimes, P. 1998: The Late Devensian glaciation of the eastern Lleyn Peninsula, North Wales: evidence for terrestrial depositional environments. Journal of Quaternary Science 13, 255-270.
97. Truffer, M. & Echelmeyer, K. A. 2003: Of isbrae and ice streams. Annals of Glaciology 36, 66-72.
98. Unwin, D. J. 1975: The nature and origin of the corrie moraines of Snowdonia. Cambria 2, 20-33.
99. Walker, M. J. C. 1980: Late-Glacial history of the Brecon Beacons, South Wales. Nature 287, 133-135.
100. Watson, E. & Watson, S. 1972: Investigations of some pingo basins near Aberystwyth, Wales. Report of the 24th International Geological Congress (Montreal), Section 12, 212-223.
101. Watson, E. & Watson, S. 1974: Remains of pingos in the Cletwr Basin, Southwest Wales. Geografiska Annaler, Series A, Physical Geography 56, 213-225.
102. Weertman, J. 1964: The theory of glacier sliding. Journal of Glaciology 5, 287-303.
103. Whittow, J. B. & Ball, D. F. 1970: North-west Wales. In Lewis, C. A. (ed.): The Glaciations of Wales and Adjoining Areas, 21-58. Longman, London.