Articles | Volume 14, issue 1
https://doi.org/10.5194/tc-14-261-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-14-261-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
28 Jan 2020
Research article |
| 28 Jan 2020
| 28 Jan 2020
Glacial sedimentation, fluxes and erosion rates associated with ice retreat in Petermann Fjord and Nares Strait, north-west Greenland
British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, CB3 0ET, UK
Center for Coastal and Ocean Mapping, University of New Hampshire,
Durham, NH 03824, USA
Martin Jakobsson
Department of Geological Sciences, Stockholm University, 106 91
Stockholm, Sweden
Bolin Centre for Climate Research, Stockholm University, 106 91
Stockholm, Sweden
Larry Mayer
Center for Coastal and Ocean Mapping, University of New Hampshire,
Durham, NH 03824, USA
Brendan T. Reilly
College of Earth, Ocean, and Atmospheric Sciences, Oregon State
University, Corvallis, OR 97331, USA
Anne E. Jennings
Institute of Arctic and Alpine Research, University of Colorado,
Boulder, CO 80309-0450, USA
Joseph S. Stoner
College of Earth, Ocean, and Atmospheric Sciences, Oregon State
University, Corvallis, OR 97331, USA
Tove Nielsen
Geological Survey of Denmark and Greenland, Øster Voldgade 10,
1350 Copenhagen K, Denmark
Katrine J. Andresen
Department of Geoscience, Aarhus University, Hoegh-Guldbergs Gade 2, 8000, Aarhus C, Denmark
Egon Nørmark
Department of Geoscience, Aarhus University, Hoegh-Guldbergs Gade 2, 8000, Aarhus C, Denmark
Katrien A. Heirman
Geological Survey of Denmark and Greenland, Øster Voldgade 10,
1350 Copenhagen K, Denmark
TNO, Geological Survey of the Netherlands, Princetonlaan 6, 3584
CB Utrecht, the Netherlands
Elina Kamla
Geological Survey of Denmark and Greenland, Øster Voldgade 10,
1350 Copenhagen K, Denmark
Rambøll Management Consulting, Hannemanns Allé 53, 2300
Copenhagen S, Denmark
Kevin Jerram
Center for Coastal and Ocean Mapping, University of New Hampshire,
Durham, NH 03824, USA
Christian Stranne
Department of Geological Sciences, Stockholm University, 106 91
Stockholm, Sweden
Bolin Centre for Climate Research, Stockholm University, 106 91
Stockholm, Sweden
Alan Mix
College of Earth, Ocean, and Atmospheric Sciences, Oregon State
University, Corvallis, OR 97331, USA
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Short summary
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Revised manuscript not accepted
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We studied the Coats Land ice margin, Antarctica, providing a multi-disciplinary geophysical assessment of the ice sheet configuration through its last advance and retreat; a description of the physical constraints on the stability of the past and present ice and future margin based on its submarine geomorphology and ice-sheet geometry; and evidence that once detached from the bed, the ice shelves in this region were predisposed to rapid retreat back to coastal grounding lines.
Zhongshi Zhang, Qing Yan, Elizabeth J. Farmer, Camille Li, Gilles Ramstein, Terence Hughes, Martin Jakobsson, Matt O'Regan, Ran Zhang, Ning Tan, Camille Contoux, Christophe Dumas, and Chuncheng Guo
Clim. Past Discuss., https://doi.org/10.5194/cp-2018-79, https://doi.org/10.5194/cp-2018-79, 2018
Revised manuscript not accepted
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Our study challenges the widely accepted idea that the Laurentide-Eurasian ice sheets gradually extended across North America and Northwest Eurasia, and suggests the growth of the NH ice sheets is much more complicated. We find climate feedbacks regulate the distribution of the NH ice sheets, producing swings between two distinct ice sheet configurations: the Laurentide-Eurasian and a circum-Arctic configuration, where large ice sheets existed over Northeast Siberia and the Canadian Rockies.
Christian Stranne, Larry Mayer, Martin Jakobsson, Elizabeth Weidner, Kevin Jerram, Thomas C. Weber, Leif G. Anderson, Johan Nilsson, Göran Björk, and Katarina Gårdfeldt
Ocean Sci., 14, 503–514, https://doi.org/10.5194/os-14-503-2018, https://doi.org/10.5194/os-14-503-2018, 2018
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The ocean surface mixed layer depth (MLD) is an important parameter within several research disciplines, as variations in the MLD influence air–sea CO2 exchange and ocean primary production. A new method is presented in which acoustic mapping of the MLD is done remotely by means of echo sounders. This method allows for observations of high-frequency variability in the MLD, as horizontal and temporal resolutions can be increased by orders of magnitude compared to traditional in situ measurements.
Göran Björk, Martin Jakobsson, Karen Assmann, Leif G. Andersson, Johan Nilsson, Christian Stranne, and Larry Mayer
Ocean Sci., 14, 1–13, https://doi.org/10.5194/os-14-1-2018, https://doi.org/10.5194/os-14-1-2018, 2018
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This study presents detailed bathymetric data along with hydrographic data at two deep passages across the Lomonosov Ridge in the Arctic Ocean. The southern channel is relatively smooth with a sill depth close to 1700 m. Hydrographic data reveals an eastward flow in the southern part and opposite in the northern part. The northern passage is characterized by a narrow and steep ridge with a sill depth of 1470 m. Here, water exchange appears to occur in well-defined but irregular vertical layers.
Laura Gemery, Thomas M. Cronin, Robert K. Poirier, Christof Pearce, Natalia Barrientos, Matt O'Regan, Carina Johansson, Andrey Koshurnikov, and Martin Jakobsson
Clim. Past, 13, 1473–1489, https://doi.org/10.5194/cp-13-1473-2017, https://doi.org/10.5194/cp-13-1473-2017, 2017
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Continuous, highly abundant and well-preserved fossil ostracodes were studied from radiocarbon-dated sediment cores collected on the Lomonosov Ridge (Arctic Ocean) that indicate varying oceanographic conditions during the last ~50 kyr. Ostracode assemblages from cores taken during the SWERUS-C3 2014 Expedition, Leg 2, reflect paleoenvironmental changes during glacial, deglacial, and interglacial transitions, including changes in sea-ice cover and Atlantic Water inflow into the Eurasian Basin.
Matt O'Regan, Jan Backman, Natalia Barrientos, Thomas M. Cronin, Laura Gemery, Nina Kirchner, Larry A. Mayer, Johan Nilsson, Riko Noormets, Christof Pearce, Igor Semiletov, Christian Stranne, and Martin Jakobsson
Clim. Past, 13, 1269–1284, https://doi.org/10.5194/cp-13-1269-2017, https://doi.org/10.5194/cp-13-1269-2017, 2017
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Past glacial activity on the East Siberian continental margin is poorly known, partly due to the lack of geomorphological evidence. Here we present geophysical mapping and sediment coring data from the East Siberian shelf and slope revealing the presence of a glacially excavated cross-shelf trough reaching to the continental shelf edge north of the De Long Islands. The data provide direct evidence for extensive glacial activity on the Siberian shelf that predates the Last Glacial Maximum.
Thomas M. Cronin, Matt O'Regan, Christof Pearce, Laura Gemery, Michael Toomey, Igor Semiletov, and Martin Jakobsson
Clim. Past, 13, 1097–1110, https://doi.org/10.5194/cp-13-1097-2017, https://doi.org/10.5194/cp-13-1097-2017, 2017
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Global sea level rise during the last deglacial flooded the Siberian continental shelf in the Arctic Ocean. Sediment cores, radiocarbon dating, and microfossils show that the regional sea level in the Arctic rose rapidly from about 12 500 to 10 700 years ago. Regional sea level history on the Siberian shelf differs from the global deglacial sea level rise perhaps due to regional vertical adjustment resulting from the growth and decay of ice sheets.
Martin Jakobsson, Christof Pearce, Thomas M. Cronin, Jan Backman, Leif G. Anderson, Natalia Barrientos, Göran Björk, Helen Coxall, Agatha de Boer, Larry A. Mayer, Carl-Magnus Mörth, Johan Nilsson, Jayne E. Rattray, Christian Stranne, Igor Semiletov, and Matt O'Regan
Clim. Past, 13, 991–1005, https://doi.org/10.5194/cp-13-991-2017, https://doi.org/10.5194/cp-13-991-2017, 2017
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The Arctic and Pacific oceans are connected by the presently ~53 m deep Bering Strait. During the last glacial period when the sea level was lower than today, the Bering Strait was exposed. Humans and animals could then migrate between Asia and North America across the formed land bridge. From analyses of sediment cores and geophysical mapping data from Herald Canyon north of the Bering Strait, we show that the land bridge was flooded about 11 000 years ago.
Johan Nilsson, Martin Jakobsson, Chris Borstad, Nina Kirchner, Göran Björk, Raymond T. Pierrehumbert, and Christian Stranne
The Cryosphere, 11, 1745–1765, https://doi.org/10.5194/tc-11-1745-2017, https://doi.org/10.5194/tc-11-1745-2017, 2017
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Recent data suggest that a 1 km thick ice shelf extended over the glacial Arctic Ocean during MIS 6, about 140 000 years ago. Here, we theoretically analyse the development and equilibrium features of such an ice shelf. The ice shelf was effectively dammed by the Fram Strait and the mean ice-shelf thickness was controlled primarily by the horizontally integrated mass balance. Our results can aid in resolving some outstanding questions of the state of the glacial Arctic Ocean.
Clint M. Miller, Gerald R. Dickens, Martin Jakobsson, Carina Johansson, Andrey Koshurnikov, Matt O'Regan, Francesco Muschitiello, Christian Stranne, and Carl-Magnus Mörth
Biogeosciences, 14, 2929–2953, https://doi.org/10.5194/bg-14-2929-2017, https://doi.org/10.5194/bg-14-2929-2017, 2017
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Continental slopes north of the East Siberian Sea are assumed to hold large amounts of methane. We present pore water chemistry from the 2014 SWERUS-C3 expedition. These are among the first results generated from this vast climatically sensitive region, and they imply that abundant methane, including gas hydrates, do not characterize the East Siberian Sea slope or rise. This contradicts previous modeling and discussions, which due to the lack of data are almost entirely based assumption.
Leif G. Anderson, Göran Björk, Ola Holby, Sara Jutterström, Carl Magnus Mörth, Matt O'Regan, Christof Pearce, Igor Semiletov, Christian Stranne, Tim Stöven, Toste Tanhua, Adam Ulfsbo, and Martin Jakobsson
Ocean Sci., 13, 349–363, https://doi.org/10.5194/os-13-349-2017, https://doi.org/10.5194/os-13-349-2017, 2017
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We use data collected in 2014 to show that the outflow of nutrient-rich water occurs much further to the west than has been reported in the past. We suggest that this is due to much less summer sea-ice coverage in the northwestern East Siberian Sea than in the past decades. Further, our data support a more complicated flow pattern in the region where the Mendeleev Ridge reaches the shelf compared to the general cyclonic circulation within the individual basins as suggested historically.
Christof Pearce, Aron Varhelyi, Stefan Wastegård, Francesco Muschitiello, Natalia Barrientos, Matt O'Regan, Thomas M. Cronin, Laura Gemery, Igor Semiletov, Jan Backman, and Martin Jakobsson
Clim. Past, 13, 303–316, https://doi.org/10.5194/cp-13-303-2017, https://doi.org/10.5194/cp-13-303-2017, 2017
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The eruption of the Alaskan Aniakchak volcano of 3.6 thousand years ago was one of the largest Holocene eruptions worldwide. The resulting ash is found in several Alaskan sites and as far as Newfoundland and Greenland. In this study, we found ash from the Aniakchak eruption in a marine sediment core from the western Chukchi Sea in the Arctic Ocean. Combined with radiocarbon dates on mollusks, the volcanic age marker is used to calculate the marine radiocarbon reservoir age at that time.
Erik Gustafsson, Christoph Humborg, Göran Björk, Christian Stranne, Leif G. Anderson, Marc C. Geibel, Carl-Magnus Mörth, Marcus Sundbom, Igor P. Semiletov, Brett F. Thornton, and Bo G. Gustafsson
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-115, https://doi.org/10.5194/bg-2017-115, 2017
Preprint withdrawn
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In this study we quantify key carbon cycling processes on the East Siberian Arctic Shelf. A specific aim is to determine the pathways of terrestrial organic carbon (OC) supplied by rivers and coastline erosion – and particularly to what extent degradation of terrestrial OC contributes to air-sea CO2 exchange. We estimate that the shelf is a weak CO2 sink, although this sink is considerably reduced mainly by degradation of eroded OC and to a lesser extent by degradation of riverine OC.
T. K. Bauska, E. J. Brook, A. C. Mix, and A. Ross
Atmos. Meas. Tech., 7, 3825–3837, https://doi.org/10.5194/amt-7-3825-2014, https://doi.org/10.5194/amt-7-3825-2014, 2014
A. Schmittner, N. Gruber, A. C. Mix, R. M. Key, A. Tagliabue, and T. K. Westberry
Biogeosciences, 10, 5793–5816, https://doi.org/10.5194/bg-10-5793-2013, https://doi.org/10.5194/bg-10-5793-2013, 2013
F. O. Nitsche, K. Gohl, R. D. Larter, C.-D. Hillenbrand, G. Kuhn, J. A. Smith, S. Jacobs, J. B. Anderson, and M. Jakobsson
The Cryosphere, 7, 249–262, https://doi.org/10.5194/tc-7-249-2013, https://doi.org/10.5194/tc-7-249-2013, 2013
Related subject area
Discipline: Ice sheets | Subject: Glacigenic Sediments
Holocene history of the 79° N ice shelf reconstructed from epishelf lake and uplifted glaciomarine sediments
James A. Smith, Louise Callard, Michael J. Bentley, Stewart S. R. Jamieson, Maria Luisa Sánchez-Montes, Timothy P. Lane, Jeremy M. Lloyd, Erin L. McClymont, Christopher M. Darvill, Brice R. Rea, Colm O'Cofaigh, Pauline Gulliver, Werner Ehrmann, Richard S. Jones, and David H. Roberts
The Cryosphere, 17, 1247–1270, https://doi.org/10.5194/tc-17-1247-2023, https://doi.org/10.5194/tc-17-1247-2023, 2023
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The Greenland Ice Sheet is melting at an accelerating rate. To understand the significance of these changes we reconstruct the history of one of its fringing ice shelves, known as 79° N ice shelf. We show that the ice shelf disappeared 8500 years ago, following a period of enhanced warming. An important implication of our study is that 79° N ice shelf is susceptible to collapse when atmospheric and ocean temperatures are ~2°C warmer than present, which could occur by the middle of this century.
Cited articles
Aarseth, I.: Western Norwegian fjord sediments: age, volume, stratigraphy,
and role as temporary depository during glacial cycles, Mar. Geol., 143,
39–53, 1997.
Alley, R. B., Blakenship, D. D., Rooney, S. T., and Bentley, C. R.:
Sedimentation beneath ice shelves – the view from Ice Stream B, Mar. Geol., 85, 101–202, 1989.
Alley, R. B., Anandakrishnan, S., Dupont, T. K., Parizek, B. R., and
Pollard, D.: Effect of Sedimentation on Ice-Sheet Grounding-Line Stability, Science,
315, 1838–1841, 2007.
Amundson, J. M., M. Fahnestock, M. Truffer, J. Brown, M. P. Lüthi, and
R. J. Motyka: Ice mélange dynamics and implications for terminus
stability, Jakobshavn Isbræ, Greenland, J. Geophys. Res.,
115, F01005, https://doi.org/10.1029/2009JF001405, 2010.
Anandakrishnan, S., Catania, G. A., Alley, R. B., and Horgan, H. J.:
Discovery of Till Deposition at the Grounding Line of Whillans Ice Stream,
Science, 315, 1835–1838, 2007.
Anderson, J. B.: Antarctic Marine Geology, Cambridge University Press,
London, UK, 1999.
Andrews, J. T., Milliman, J. D., Jennings, A. E., Rynes, N., and Dwyer, J.:
Sediment Thicknesses and Holocene Glacial Marine Sedimentation Rates in
Three East Greenland Fjords (ca. 68∘ N), J. Geol.,
102, 669–683, 1994.
Bellwald, B., Hjelstuen, B. O., Sejrup, H. P., and Haflidason, H.:
Postglacial mass movements and depositional environments in a high-latitude
fjord system – Hardangerfjorden, Western Norway, Mar. Geol., 379,
157–175, 2016.
Bjarnadóttir, L. R., Rüther, D. C., Winsborrow, M. C. M., and
Andreassen, K.: Grounding-line dynamics during the last deglaciation of
Kveithola, W Barents Sea, as revealed by seabed geomorphology and shallow
seismic stratigraphy, Boreas, 42, 84–107, 2013.
Bøe, R., Longva, O., Lepland, A., Blikra, L. H., Sønstegaard, E.,
Haflidason, H., Bryn, P., and Lien, R.: Postglacial mass movements and their
causes in fjords and lakes in western Norway, Norsk Geol. Tidsskr.,
84, 35–55, 2004.
Briner, J. P., Miller, G. H., Davis, P. T., and Finkel, R. C.: Cosmogenic
radionuclides from fiord landscapes support differential erosion by
overriding ice sheets, GSA Bulletin, 118, 406–420, 2006.
Cai, C., Rignot, E., Menemenlis, D., and Nakayama, Y.: Observations and
modeling of ocean-induced melt beneath Petermann Glacier Ice Shelf in
northwestern Greenland, Geophys. Res. Lett., 44, 8396–8403, 2017.
Callard, S. L., Ó Cofaigh, C., Benetti, S., Chiverrell, R. C., Van
Landeghem, K. J. J., Saher, M. H., Gales, J. A., Small, D., Clark, C. D.,
Livingstone, S. J., Fabel, D., and Moreton, S. G.: Extent and retreat
history of the Barra Fan Ice Stream offshore western Scotland and northern
Ireland during the last glaciation, Quaternary Sci. Rev., 201,
280–302, 2018.
Christoffersen, P., Tulaczyk, S., and Behar, A.: Basal ice sequences in
Antarctic ice stream: Exposure of past hydrologic conditions and a principal
mode of sediment transfer, J. Geophys. Res.-Earth,
115, F03034, https://doi.org/10.1029/2009JF001430, 2010.
Cochrane, G. R., De Santis, L., and Cooper, A. K.: Seismic velocity
expression of glacial sedimentary rocks beneath the Ross Sea from sonobuoy
seismic-refraction data, Antar. Res. S., 68, 261–270, 1995.
Cowton, T., Nienow, P., Bartholomew, I., Sole, A., and Mair, D.: Rapid
erosion beneath the Greenland ice sheet, Geology, 40, 343–346, 2012.
Dawes, W.: Explanatory notes to the Geological map of Greenland, 1:500 000,
Humboldt Gletscher, Sheet 6. 1–48, Geological Survey of Denmark and
Greenland, Copenhagen, Denmark, 2004.
Dawes, P. R., Frisch, T., Garde, A. A., Iannelli, T. R., Ineson, J. R., Jensen, S. M., Pirajno, F., Sønderholm, M., Stemmerik, L., and Stouge, S.: Kane Basin 1999: mapping, stratigraphic studies and economic assessment of Precambrian and Lower Palaeozoic provinces in north-western Greenland, Geology of Greenland Survey Bulletin, 186, 11–28, 2000.
DMI: https://www.dmi.dk/en/groenland/hav/ice-charts/ (last access: 9 December 2019), 2018.
Dowdeswell, J. A. and Fugelli, E.: The seismic architecture and geometry of
grounding-zone wedges formed at the marine margins of past ice sheets,
Geol. Soc. Am. Bull., 124, 1750–1761, 2012.
Dühnforth, M., Anderson, R. S., Ward, D., and Stock, G. M.: Bedrock
fracture control of glacial erosion processes and rates, Geology, 38,
423–426, 2010.
Elverhøi, A., Pfirman, S. L., Solheim, A., and Larssen, B. B.:
Glacimarine sedimentation in epicontinental seas exemplified by the northern
Barents Sea, Mar. Geol., 85, 225–250, 1989.
Elverhøi, A., Svendsen, J. I., Solheim, A., Andersen, E. S., Milliman,
J., Mangerud, J., and Hooke, R. L.: Late Quaternary Sediment Yield from the
High Arctic Svalbard Area, J. Geol., 103, 1–17, 1995.
Elverhøi, A., Hooke, R. L., and Solheim, A.: Late Cenozoic erosion and
sediment yield from the Svalbard–Barents Sea region: implications for
understanding erosion of glacierized basins, Quaternary Sci. Rev., 17,
209–241, 1998.
Enderlin, E. M., Howat, I. M., Jeong, S., Noh, M.-J., van Angelen, J. H.,
and van den Broeke, M. R.: An improved mass budget for the Greenland ice
sheet, Geophys. Res. Lett., 41, 866–872, 2014.
Engelhardt, H. F. and Kamb, B.: Basal sliding of Ice Stream B, West
Antarctica, J. Glaciol., 44, 223–230, 1998.
England, J.: Coalescent Greenland and Innuitian ice during the Last Glacial
Maximum: revising the Quaternary of the Canadian High Arctic, Quaternary Sci. Rev., 18, 421–456, 1999.
England, J., Atkinson, N., Bednarski, J., Dyke, A. S., Hodgson, D. A., and
Ó Cofaigh, C.: The Innuitian Ice Sheet: configuration, dynamics and
chronology, Quaternary Sci. Rev., 25, 689–703, 2006.
Esteves, M., Bjarnadóttir, L. R., Winsborrow, M. C. M., Shackleton, C.
S., and Andreassen, K.: Retreat patterns and dynamics of the
Sentralbankrenna glacial system, central Barents Sea, Quaternary Sci. Rev., 169, 131–147, 2017.
Evans, J., Dowdeswell., J.A., Grobe, H., Niessen, F., Stein, R., Hubberten,
H.-W., and Whittington, R. J.: Late Quaternary sedimentation in Kejser
Franz Joseph Fjord and the continental margin of East Greenland, Geological
Society, London, Special Publications, 203, 149–179, 2002.
Fernandez, R. A., Anderson, J. B., Wellner, J. S., Minzoni, R. L., Hallet,
B., and Smith, R. T.: Latitudinal variation in glacial erosion rates from
Patagonia and the Antarctic Peninsula (46∘ S–65∘ S),
GSA Bulletin, 128, 1000–1023, 2016.
Flink, A. E., Noormets, R., Kirchner, N., Benn, D. I., Luckman, A., and
Lovell, H.: The evolution of a submarine landform record following recent
and multiple surges of Tunabreen glacier, Svalbard, Quaternary Sci. Rev., 108, 37–50, 2015.
Funder, S., Kjeldsen, K. K., Kjær, K. H., and Ó Cofaigh, C.: Chapter
50 – The Greenland Ice Sheet During the Past 300,000 Years: A Review, in:
Developments in Quaternary Sciences, edited by: Ehlers, J., Gibbard, P. L., and Hughes,
P. D., Elsevier, Amsterdam, the Netherlands, 2011.
Georgiadis, E., Giraudeau, J., Martinez, P., Lajeunesse, P., St-Onge, G., Schmidt, S., and Massé, G.: Deglacial to postglacial history of Nares Strait, Northwest Greenland: a marine perspective from Kane Basin, Clim. Past, 14, 1991–2010, https://doi.org/10.5194/cp-14-1991-2018, 2018.
Gilbert, R., Nielsen, N., Desloges, J. R., and Rasch, M.: Contrasting
glacimarine sedimentary environments of two arctic fiords on Disko, West
Greenland, Mar. Geol., 147, 63–83, 1998.
Gilbert, R., Nielsen, N., Möller, H., Desloges, J. R., and Rasch, M.: Glacimarine
sedimentation in Kangerdluk (Disko Fjord), West Greenland, in response to a
surging glacier, Mar. Geol., 191, 1–18, 2002.
Gohl, K.: The Expedition of the Research Vessel “Polarstern” to the
Amundsen Sea, Antarctica, in 2010 (ANT-XXVI/3), Berichte zur Polar- und
Meeresforschung, Alfred Wegener Institute for Polar and Marine Research,
Bremerhaven, Germany, 168 pp., 2010.
Goudie, A. S.: The Schmidt Hammer in geomorphological research, Prog.
Phys. Geog., 30, 703–718, 2006.
Hallet, B., Hunter, L., and Bogen, J.: Rates of erosion and sediment
evacuation by glaciers: A review of field data and their implications,
Global Planet. Change, 12, 213–235, 1996.
Hamilton, E. L.: Sound velocity, elasticity, and related properties of
marine sediments, North Pacific, 1, Sediment properties, environmental
control, and empirical relationships, Naval Undersea Research Development
Center Technical Publication 1J3, San Diego, CA, USA, 1969.
Hasholt, B., van As, D., Mikkelsen, A. B., Mernild, S. H., and Yde, J. C.:
Observed sediment and solute transport from the Kangerlussuaq sector of the
Greenland Ice Sheet (2006–2016), Arct. Antarct. Alp. Res.,
50, S100009, https://doi.org/10.1080/15230430.2018.1433789, 2018.
Hawkings, J. R., Wadham, J. L., Tranter, M., Lawson, E., Sole, A., Cowton,
T., Tedstone, A. J., Bartholomew, I., Nienow, P., Chandler, D., and Telling,
J.: The effect of warming climate on nutrient and solute export from the
Greenland Ice Sheet, Geochem. Perspect. Lett., 1, 94–104, 2015.
Henriksen, N., Higgins, A. K., Kalsbeek, F., and Pulvertaft, T. C.:
Greenland from Archaean to Quaternary Descriptive text to the 1995
Geological map of Greenland, 1 : 2 500 000, Geological Survey of Denmark and Greenland Bulletin, 18, 1–93, 2009.
Hesse, R., Khodabakhsh, S., Klaucke, I., and Ryan, W. B. F.: Asymmetrical
turbid surface-plume deposition near ice-outlets of the Pleistocene
Laurentide ice sheet in the Labrador Sea, Geo-Mar. Lett., 17, 179–187,
1997.
Heuzé, C., Wåhlin, A., Johnson, H. L., and Münchow, A.: Pathways
of Meltwater Export from Petermann Glacier, Greenland, J. Phys.
Oceanogr., 47, 405–418, 2017.
Hjelstuen, B. O., Haflidason, H., Sejrup, H. P., and Lyså, A.:
Sedimentary processes and depositional environments in glaciated fjord
systems – Evidence from Nordfjord, Norway, Mar. Geol., 258, 88–99,
2009.
Hofstede, C., Christoffersen, P., Hubbard, B., Doyle, S. H., Young, T. J.,
Diez, A., Eisen, O., and Hubbard, A.: Physical Conditions of Fast Glacier
Flow: 2. Variable Extent of Anisotropic Ice and Soft Basal Sediment From
Seismic Reflection Data Acquired on Store Glacier, West Greenland, J. Geophys. Res.-Earth, 123, 349–362, 2018.
Hogan, K. A., Dowdeswell, J., and Cofaigh, C. Ó.: Glacimarine sedimentary
processes and depositional environments in an embayment fed by West
Greenland ice streams, Mar. Geol., 311, 1–16, 2012.
Holland, D. M., Thomas, R. H., De Yound, B., Ribergaard, M. H., and Lyberth,
B.: Acceleration of Jakobshavn Isbræ triggered by warm subsurface ocean
waters, Nat. Geosci., 1, 659–664, 2008.
Hooke, R. and Elverhøi, A.: Sediment flux from a fjord during glacial
periods, Isfjorden, Spitsbergen, Global Planet. Change, 12, 237–249,
1996.
Howat, I. M.: MEaSUREs Greenland Ice Velocity: Selected Glacier Site
Velocity Maps from Optical Images, Version 2, edited by: Howat, I. M., NASA
National Snow and Ice Data Center Distributed Active Archive Center. Ice
Velocity, Boulder, Colorado, USA, 2017.
Hunter, L.: Grounding-line systems of modern temperate glaciers and their
effects on glacier stability, PhD, Northern Illinois University, DeKalb, USA,
467 pp., 1994.
Jackson, H. R., Hannon, T., Neben, S., Piepjohn, K., and Brent, T.: Seismic
Reflection Profiles from Kane to Hall Basin, Nares Strait: Evidence for
Faulting, Polarforschung, 74, 21–39, 2006.
Jakobsson, M., Mayer, L., Coakley, B., Dowdeswell, J. A., Forbes, S.,
Fridman, B., Hodnesdal, H., Noormets, R., Pedersen, R., Rebesco, M.,
Schenke, H. W., Zarayskaya, Y., Accettella, D., Armstrong, A., Anderson, R.
M., Bienhoff, P., Camerlenghi, A., Church, I., Edwards, M., Gardner, J. V.,
Hall, J. K., Hell, B., Hestvik, O., Kristoffersen, Y., Marcussen, C.,
Mohammad, R., Mosher, D., Nghiem, S. V., Pedrosa, M. T., Travaglini, P. G.,
and Weatherall, P.: The International Bathymetric Chart of the Arctic Ocean
(IBCAO) Version 3.0, Geophys. Res. Lett., 39, L12609, https://doi.org/10.1029/2012GL052219, 2012.
Jakobsson, M., Hogan, K. A., Mayer, L. A., Mix, A., Jennings, A., Stoner,
J., Eriksson, B., Jerram, K., Mohammad, R., Pearce, C., Reilly, B., and
Stranne, C.: The Holocene retreat dynamics and stability of Petermann
Glacier in northwest Greenland, Nat. Commun., 9, 2104, https://doi.org/10.1038/s41467-018-04573-2, 2018.
Jennings, A. E., Sheldon, C., Cronin, T. M., Francus, P., Stoner, J., and
Andrews, J.: The Holocene History Of Nares Strait: Transition from Glacial
Bay to Arctic-Atlantic Throughflow, Oceanography, 24, 26–41, 2011.
Jennings, A. E., Reilly, B., Andrews, J., Walczak, M., Stoner, J., Mix, A., and
Jakobsson, M.: Sediment and Faunal Evidence of Ice Shelves and Their
Disintegration during the Early Holocene Deglaciation of Nares Strait, American Geophysical Union, Fall Meeting 2018, 10–14 December 2018,
Washington, D.C., USA, PP41B-02, 2018.
Jennings, A. E., Andrews, J. T., Oliver, B., Walczak, M., and Mix, A.:
Retreat of the Smith Sound Ice Stream in the Early Holocene, Boreas, 48,
825–840, 2019.
Johnson, H. L., Münchow, A., Falkner, K. K., and Melling, H.: Ocean
circulation and properties in Petermann Fjord, Greenland, J. Geophys. Res.-Oceans, 116, C01003, https://doi.org/10.1029/2010JC006519, 2011.
Kamb, B.: Basal Zone of the West Antarctic Ice Streams and its Role in
Lubrication of Their Rapid Motion, in: The West Antarctic Ice Sheet:
Behavior and Environment, Antar. Res. S., 77, 157–199, 2001.
King, E. C., Woodward, J., and Smith, A. M.: Seismic evidence for a
water-filled canal in deforming till beneath Rutford Ice Stream, West
Antarctica, Geophys. Res. Lett., 31, L20402, https://doi.org/10.1029/2004GL020379, 2004.
Koppes, M. and Hallet, B.: Erosion rates during rapid deglaciation in Icy
Bay, Alaska, J. Geophys. Res.-Earth, 111, F02023, https://doi.org/10.1029/2005JF000349, 2006.
Koppes, M., Hallet, B., Rignot, E., Mouginot, J., Wellner, J. S., and Boldt,
K.: Observed latitudinal variations in erosion as a function of glacier
dynamics, Nature, 526, 100–103, https://doi.org/10.1038/nature15385, 2015.
Koppes, M., Hallet, B., and Anderson, J.: Synchronous acceleration of ice loss and glacial erosion, Glaciar Marinelli, Chilean Tierra del Fuego, J. Glaciol., 55, 207–220, 2009.
Koppes, M. N. and Montgomery, D. R.: The relative efficacy of fluvial and
glacial erosion over modern to orogenic timescales, Nat. Geosci., 2,
644–647, https://doi.org/10.1038/ngeo616, 2009.
Koppes, M. L. N. and Hallet, B.: Influence of rapid glacial retreat on the
rate of erosion by tidewater glaciers, Geology, 30, 47–50, 2002.
Krabbendam, M. and Glasser, N. F.: Glacial erosion and bedrock properties in
NW Scotland: Abrasion and plucking, hardness and joint spacing,
Geomorphology, 130, 374–383, 2011.
Laberg, J. S. and Vorren, T. O.: The Trænadjupet Slide, offshore Norway
– morphology, evacuation and triggering mechanisms, Mar. Geol., 171,
95–114, 2000.
Larsen, N. K., Kjær, K. H., Funder, S., Möller, P., van der Meer, J.
J. M., Schomacker, A., Linge, H., and Darby, D. A.: Late Quaternary
glaciation history of northernmost Greenland – Evidence of shelf-based ice,
Quaternary Sci. Rev., 29, 3399–3414, 2010.
Larter, R. D. and Vanneste, L. E.: Relict subglacial deltas on the Antarctic
Peninsula outer shelf, Geology, 23, 33–36, 1995.
Lecavalier, B. S., Fisher, D. A., Milne, G. A., Vinther, B. M., Tarasov, L.,
Huybrechts, P., Lacelle, D., Main, B., Zheng, J., Bourgeois, J., and Dyke,
A. S.: High Arctic Holocene temperature record from the Agassiz ice cap and
Greenland ice sheet evolution, P. Natl. Acad.
Sci. USA, 114, 5952–5957, https://doi.org/10.1073/pnas.1616287114, 2017.
Lomac-MacNair, K., Jakobsson, M., Mix, A., Freire, F., Hogan, K., Mayer, L.,
and Smultea, M. A.: Seal occurrence and habitat use during summer in
Petermann Fjord, northwestern Greenland, Arctic, 71, 334–349, 2018.
MacDonald, G., Banwell, A. F., and MacAyeal, D. R.: Seasonal evolution of
supraglacial lakes on a floating ice tongue, Petermann Glacier, Greenland,
Ann. Glaciol., 59, 56–65, 2018.
Madaj, L.: Holocene Organic Carbon and Carbonate Records from Northeast
Baffin Bay: Preliminary Age Model and Paleoenvironmental Significance, MSc,
Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden, 48 pp., 2016.
Möller, P., Larsen, N. K., Kjær, K. H., Funder, S., Schomacker, A.,
Linge, H., and Fabel, D.: Early to middle Holocene valley glaciations on
northernmost Greenland, Quaternary Sci. Rev., 29, 3379–3398, 2010.
Mouginot, J., Rignot, E., Bjørk, A. A., van den Broeke, M., Millan, R.,
Morlighem, M., Noël, B., Scheuchl, B., and Wood, M.: Forty-six years of
Greenland Ice Sheet mass balance from 1972 to 2018, P.
Natl. Acad. Sci. USA, 116, 9239–9244, https://doi.org/10.1073/pnas.1904242116, 2019.
Mudie, P. J., Rochon, A., Prins, M. A., Soenarjo, D., Troelstra, S. R.,
Levac, E., Scott, D. B., Roncaglia, L., and Kuijpers, A.: Late
Pleistocene-Holocene Marine Geology of Nares Strait Region:
Palaeoceanography from Foraminifera and Dinoflagellate Cysts, Sedimentology
and Stable Isotopes, Polarforschung, 74, 169–183, 2006.
Münchow, A., Melling, H., and Falkner, K. K.: An Observational Estimate
of Volume and Freshwater Flux Leaving the Arctic Ocean through Nares Strait,
J. Phys. Oceanogr., 36, 2025–2041, 2006.
Münchow, A., Padman, L., Washam, P., and Nicholls, K. W.: The Ice Shelf
Of Petermann Gletscher, North Greenland, And Its Connection To The Arctic
And Atlantic Oceans, Oceanography, 29, 84–95, 2016.
Nick, F. M., Luckman, A., Vieli, A., Van Der Veen, C.J., Van As, D., Van De
Wal, R. S. W., Pattyn, F., Hubbard, A. L., and Floriciou, D.: The response of
Petermann Glacier, Greenland, to large calving events, and its future
stability in the context of atmospheric and oceanic warming, J. Glaciol., 208, 229–239, 2012.
Nielsen, T. and Rasmussen, T. L.: Reconstruction of ice sheet retreat after
the Last Glacial maximum in Storfjorden, southern Svalbard, Mar. Geol.,
402, 228–243, 2018.
Nitsche, F. O., Gohl, K., Larter, R. D., Hillenbrand, C.-D., Kuhn, G., Smith, J. A., Jacobs, S., Anderson, J. B., and Jakobsson, M.: Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica, The Cryosphere, 7, 249–262, https://doi.org/10.5194/tc-7-249-2013, 2013.
Nygård, A.: Pleistocene sedimentary processes and glacial
history of the Southern Norwegian continental margin, PhD, University of
Bergen, Bergen, Norway, 126 pp., 2003.
Nygård, A., Sejrup, H. P., Haflidason, H., Lekens, W. A. H.,
Clark, C. D., and Bigg, G. R.: Extreme sediment and ice discharge from
marine-based ice streams: New evidence from the North Sea, Geology, 35,
395–398, 2007.
Ó Cofaigh, C., Dowdeswell, J. A., and Grobe, H.: Holocene glacimarine
sedimentation, inner Scoresby Sund, East Greenland: influence of
fast-flowing ice-sheet outlet glaciers, Mar. Geol., 175, 103–129, 2001.
Ó Cofaigh, C., Dowdeswell, J. A., Allen, C. S., Hiemstra, J. F., Pudsey,
C. J., Evans, J., and Evans, D. J. A.: Flow dynamics and till genesis
associated with a marine-based Antarctic palaeo-ice stream, Quaternary Sci. Rev., 24, 709–740, 2005.
Ó Cofaigh, C., Dowdeswell, J. A., Jennings, A. E., Hogan, K. A., Kilfeather, A., Hiemstra, J. F., Noormets, R., Evans, J., McCarthy, D. J., Andrews, J. T., Lloyd, J. M., and Moros, M.: An extensive and dynamic ice sheet on the West Greenland shelf during the last glacial cycle, Geology, 41, 219–222, 2013.
Ó Cofaigh, C., Hogan, K. A., Dowdeswell, J. A., and Streuff, K.: Stratified
glacimarine basin-fills in West Greenland fjords, Geological Society,
London, Memoirs, 46, 99–100, 2016.
O'Regan, M., Backman, J., Barrientos, N., Cronin, T. M., Gemery, L., Kirchner, N., Mayer, L. A., Nilsson, J., Noormets, R., Pearce, C., Semiletov, I., Stranne, C., and Jakobsson, M.: The De Long Trough: a newly discovered glacial trough on the East Siberian continental margin, Clim. Past, 13, 1269–1284, https://doi.org/10.5194/cp-13-1269-2017, 2017.
Ottesen, D. and Dowdeswell, J. A.: Assemblages of submarine landforms
produced by tidewater glaciers in Svalbard, J. Geophys. Res.-Earth, 111, F01016, https://doi.org/10.1029/2005JF000330, 2006.
Overeem, I., Hudson, B. D., Syvitski, J. P. M., Mikkelsen, A. B., Hasholt,
B., van den Broeke, M. R., Noël, B. P. Y., and Morlighem, M.:
Substantial export of suspended sediment to the global oceans from glacial
erosion in Greenland, Nat. Geosci., 10, 859–863, 2017.
Pollard, D., DeConto, R. M., and Alley, R. B.: Potential Antarctic Ice Sheet
retreat driven by hydrofracturing and ice cliff failure, Earth Planet.
Sc. Lett., 412, 112–121, 2015.
Powell, R. D.: Glacimarine processes and inductive lithofacies modelling of
ice shelf and tidewater glacier sediments based on Quaternary examples,
Mar. Geol., 57, 1–52, 1984.
Powell, R. D.: Subaquatic Landsystems: fjord, in: Glacial Landsystems,
edited by: Evans, D. J. A., Hodder Arnold, London, UK, 2005.
Powell, R. D. and Domack, G. W.: 12 – Modern glacimarine environments, in:
Modern and Past Glacial Environments, edited by: Menzies, J.,
Butterworth-Heinemann, Oxford, UK, 2002.
Powell, R. D., Anderson, J. B., and Ashley, G. M.: Grounding-line systems as second-order controls on fluctuations of tidewater termini of temperate glaciers, Glacial marine sedimentation: paleoclimatic significance, Geological Society of America, Special Paper Boulder, CO, USA, 261, 75–93, 1991.
Reilly, B. T., Stoner, J. S., and Wiest, J.: SedCT: MATLABTM tools for
standardized and quantitative processing of sediment core computed
tomography (CT) data collected using a medical CT scanner, Geochem. Geophy.
Geosy., 18, 3231–3240, 2017.
Reilly, B. T., Stoner, J., Mix, A., Walczak, M. H., Jennings, A., Jakobsson,
M., Dyke, L., Glueder, A., Nicholls, K. W., Hogan, K., Mayer, L. A.,
Hatfield, R., Fallon, S., and Cheseby, M.: Holocene Break-up and
Reestablishment of the Petermann Ice Tongue, Northwest Greenland, Quaternary Sci. Rev., 218, 322–342, 2019.
Reimer, P. J., Bard, E., Bayliss, A., Beck, J. W., Blackwell, P. G., Ramsey,
C. B., Buck, C. E., Cheng, H., Edwards, R. L., Friedrich, M., Grootes, P.
M., Guilderson, T. P., Haflidason, H., Hajdas, I., Hatté, C., Heaton, T.
J., Hoffmann, D. L., Hogg, A. G., Hughen, K. A., Kaiser, K. F., Kromer, B.,
Manning, S. W., Niu, M., Reimer, R. W., Richards, D. A., Scott, E. M.,
Southon, J. R., Staff, R. A., Turney, C. S. M., and van der Plicht, J.:
IntCal13 and Marine13 Radiocarbon Age Calibration Curves 0–50 000 Years cal
BP, Radiocarbon, 55, 1869–1887, 2013.
Rignot, E. and Kanagaratnam, P.: Changes in the Velocity Structure of the
Greenland Ice Sheet, Science, 311, 986–990, 2006.
Roberts, D. H. and Long, A. J.: Streamlined bedrock terrain and fast ice
flow, Jakobshavns Isbræ, West Greenland: implications for ice stream and
ice sheet dynamics, Boreas, 34, 25–42, 2005.
Roberts, D. H., Lloyd, J. M., O Cofaigh, C., Callard, S. L., Grobe, H., and
Kappelsberger, M.: NEGIS: Understanding the mechanisms controlling the
long-term stability of the Northeast Greenland Ice Stream, in: The
Expedition PS100 of the Research Vessel POLARSTERN to the Fram Strait in
2016, edited by: Kanzow, T., Berichte zur Polar-und Meeresforschung: Reports on
Polar and Marine Research, Alfred Wegener Institut, Bremerhaven, Germany, 2017.
Smith, A. M.: Basal conditions on Rutford Ice Stream, West Antarctica, from
seismic observations, J. Geophys. Res.-Sol. Ea., 102,
543–552, 1997.
Smith, J. A., Graham, A. G., Post, A. L., Hillenbrand, C. D., Bart, P. J., and Powell, R. D.: The marine geological imprint of Antarctic ice shelves, Nat. Commun., 10, 5635, https://doi.org/10.1038/s41467-019-13496-5, 2019.
Smith, R. W., Bianchi, T. S., Allison, M., Savage, C., and Galy, V.: High
rates of organic carbon burial in fjord sediments globally, Nat. Geosci., 8, 450–453, 2015.
Smith, W. H. F. and Wessel, P.: Gridding with continuous curvature splines
in tension, Geophysics, 55, 293–305, 1990.
Stoker, M. S., Bradwell, T., Howe, J. A., Wilkinson, I. P., and McIntyre,
K., Lateglacial ice-cap dynamics in NW Scotland: evidence from the fjords of
the Summer Isles region, Quaternary Sci. Rev., 28, 3161–3184, 2009.
Straneo, F., Sutherland, D. A., Holland, D., Gladish, C., Hamilton, G. S.,
Johnson, H. L., Rignot, E., Xu, Y., and Koppes, M.: Characteristics of ocean
waters reaching Greenland's glaciers, Ann. Glaciol., 53, 202–210,
2012.
Stravers, J. A. and Syvitski, J. P. M.: Land-Sea Correlations and Evolution
of the Cambridge Fiord Marine Basin during the Last Deglaciation of Northern
Baffin Island, Quaternary Res., 35, 72–90, 1991.
Streuff, K., Ó Cofaigh, C., Hogan, K., Jennings, A., Lloyd, J. M.,
Noormets, R., Nielsen, T., Kuijpers, A., Dowdeswell, J. A., and Weinrebe,
W.: Seafloor geomorphology and glacimarine sedimentation associated with
fast-flowing ice sheet outlet glaciers in Disko Bay, West Greenland,
Quaternary Sci. Rev., 169, 206–230, 2017.
Stroeven, A. P., Fabel, D., Harbor, J., Hättestrand, C., and Kleman, J.:
Reconstructing the erosion history of glaciated passive margins:
applications of in situ produced cosmogenic nuclide techniques, Geological
Society, London, Special Publications, 196, 153–168, https://doi.org/10.1144/GSL.SP.2002.196.01.10, 2002.
Sugden, D. E., Glasser, N., and Clapperton, C. M.: Evolution of Large Roches
Moutonnées, Geogr. Ann. A, 74,
253–264, 1992.
Syvitski, J. P. M. and Shaw, J.: Sedimentology and Geomorphology of Fjords,
Developments in Sedimentology, 53, 113–178, 1995.
Syvitski, J. P. M., Andrews, J. T., and Dowdeswell, J. A.: Sediment
deposition in an iceberg-dominated glacimarine environment, East Greenland:
basin fill implications, Global Planet. Change, 12, 251–270, 1996.
Tessensohn, F., Jackson, H. R., and Reid, I. D.: The tectonic evolution of
Nares strait: implications of new data, Polarforschung, 2006, 191–198, 2006.
Tinto, K. J., Bell, R. E., Cochran, J. R., and Münchow, A.: Bathymetry
in Petermann fjord from Operation IceBridge aerogravity, Earth Planet.
Sc. Lett., 422, 58–66, 2015.
Tulaczyk, S., Kamb, B., Scherer, R. P., and Engelhardt, H. F.: Sedimentary
processes at the base of a West Antarctic ice stream; constraints from
textural and compositional properties of subglacial debris, J.
Sediment. Res., 68, 487–496, 1998.
Uenzelmann-Neben, G., Jokat, W., and Vanneste, K.: Quaternary sediments in
Scoresby Sund, East Greenland: their distribution as revealed by reflection
seismic data, LUNDQUA Report, 33, 139–148, 1991.
Walter, F., Chaput, J., and Lüthi, M. P.: Thick sediments beneath
Greenland's ablation zone and their potential role in future ice sheet
dynamics, Geology, 42, 487–490, 2014.
Young, N. E. and Briner, J. P.: Holocene evolution of the western Greenland Ice Sheet: Assessing geophysical ice-sheet models with geological reconstructions of ice-margin change, Quaternary Sci. Rev., 114, 1–17, 2015.
Young, N. E., Briner, J. P., Rood, D. H., Finkel, R. C., Corbett, L. B., and
Bierman, P. R.: Age of the Fjord Stade moraines in the Disko Bugt region,
western Greenland, and the 9.3 and 8.2 ka cooling events, Quaternary Sci. Rev., 60, 76–90, 2013.
Yr.no: https://www.yr.no/place/Greenland/Other/Thule_Air_Base/, last access: 9 December 2019.
Short summary
Glacial sediments in fjords hold a key record of environmental and ice dynamic changes during ice retreat. Here we use a comprehensive geophysical survey from the Petermann Fjord system in NW Greenland to map these sediments, identify depositional processes and calculate glacial erosion rates for the retreating palaeo-Petermann ice stream. Ice streaming is the dominant control on glacial erosion rates which vary by an order of magnitude during deglaciation and are in line with modern rates.
Glacial sediments in fjords hold a key record of environmental and ice dynamic changes during...
