Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery

Lavoie, Caroline; Domack, Eugene W.; Pettit, E. C.; Scambos, T. A.; Larter, Robert D; Schenke, Hans Werner; Yoo, Kyu‐Cheul; Gutt, Julian; Wellner, Julia S.; Canals, Miquel; Anderson, John B.; Amblàs, David

doi:10.5194/tc-9-613-2015

Cited by 47 publications

(46 citation statements)

References 64 publications

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“…8). The ice cap that expanded across the South Georgia shelf at the LGM is comparable to the expansion of the northern Antarctic Peninsula Ice Sheet70 and South Orkney Ice Cap71 which were both significantly advanced up to ∼19 cal ka B.P 617…”

Section: Discussionmentioning

confidence: 94%

Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation

et al. 2017

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The history of glaciations on Southern Hemisphere sub-polar islands is unclear. Debate surrounds the extent and timing of the last glacial advance and termination on sub-Antarctic South Georgia in particular. Here, using sea-floor geophysical data and marine sediment cores, we resolve the record of glaciation offshore of South Georgia through the transition from the Last Glacial Maximum to Holocene. We show a sea-bed landform imprint of a shelf-wide last glacial advance and progressive deglaciation. Renewed glacier resurgence in the fjords between c. 15,170 and 13,340 yr ago coincided with a period of cooler, wetter climate known as the Antarctic Cold Reversal, revealing a cryospheric response to an Antarctic climate pattern extending into the Atlantic sector of the Southern Ocean. We conclude that the last glaciation of South Georgia was extensive, and the sensitivity of its glaciers to climate variability during the last termination more significant than implied by previous studies.

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Section: Discussionmentioning

confidence: 94%

Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation

et al. 2017

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“…Lavoie et al . [] investigated a bathymetric compilation around the Antarctic Peninsula and inferred the presence of seven local marine ice domes. These ice domes served as lateral constraints that guided the ice stream outlets.…”

Section: Discussionmentioning

confidence: 98%

A new bathymetry of the Northeast Greenland continental shelf: Constraints on glacial and other processes

Arndt

Jokat

Dorschel

et al. 2015

Geochem Geophys Geosyst

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RESEARCH ARTICLE 10.1002/2015GC005931A new bathymetry of the Northeast Greenland continental shelf: Constraints on glacial and other processes (748N-818N) is presented. The DBM has a grid cell size of 250 m 3 250 m and incorporates bathymetric data from 30 multibeam cruises, more than 20 single-beam cruises and first reflector depths from industrial seismic lines. The new DBM substantially improves the bathymetry compared to older models. The DBM not only allows a better delineation of previously known seafloor morphology but, in addition, reveals the presence of previously unmapped morphological features including glacially derived troughs, fjords, groundingzone wedges, and lateral moraines. These submarine landforms are used to infer the past extent and iceflow dynamics of the Greenland Ice Sheet during the last full-glacial period of the Quaternary and subsequent ice retreat across the continental shelf. The DBM reveals cross-shelf bathymetric troughs that may enable the inflow of warm Atlantic water masses across the shelf, driving enhanced basal melting of the marine-terminating outlet glaciers draining the ice sheet to the coast in Northeast Greenland. Knolls, sinks, and hummocky seafloor on the middle shelf are also suggested to be related to salt diapirism. North-southorientated elongate depressions are identified that probably relate to ice-marginal processes in combination with erosion caused by the East Greenland Current. A single guyot-like peak has been discovered and is interpreted to have been produced during a volcanic event approximately 55 Ma ago.

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“…Beyond that, our analysis of new velocity data shows that some of the glaciers slowed down significantly during recent years. Strong acceleration and increase of calving flux is observed for HGE glaciers and Crane Glacier, downstream of which the seafloor map shows deep troughs (Lavoie et al, 2015). Scambos et al (2004) Farinotti et al (2013Farinotti et al ( , 2014 ance flux (Rott et al, 2011), the resulting rate of mass loss decreased from 3.87 to 0.57 Gt a −1 .…”

Section: Discussionmentioning

confidence: 99%

Evolution of surface velocities and ice discharge of Larsen B outlet glaciers from 1995 to 2013

et al. 2015

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Abstract. We use repeat-pass SAR data to produce detailed maps of surface motion covering the glaciers draining into the former Larsen B Ice Shelf, Antarctic Peninsula, for different epochs between 1995 and 2013. We combine the velocity maps with estimates of ice thickness to analyze fluctuations of ice discharge. The collapse of the central and northern sections of the ice shelf in 2002 led to a near-immediate acceleration of tributary glaciers as well as of the remnant ice shelf in Scar Inlet. Velocities of most of the glaciers discharging directly into the ocean remain to date well above the velocities of the pre-collapse period. The response of individual glaciers differs and velocities show significant temporal fluctuations, implying major variations in ice discharge as well. Due to reduced velocity and ice thickness the ice discharge of Crane Glacier decreased from 5.02 Gt a −1 in 2007 to 1.72 Gt a −1 in 2013, whereas Hektoria and Green glaciers continue to show large temporal fluctuations in response to successive stages of frontal retreat. The velocity on Scar Inlet ice shelf increased 2-3-fold since 1995, with the largest increase in the first years after the break-up of the main section of Larsen B. Flask and Leppard glaciers, the largest tributaries to Scar Inlet ice shelf, accelerated. In 2013 their discharge was 38 % and 46 % higher than in 1995.

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Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery

Cited by 47 publications

References 64 publications

Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation

Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation

A new bathymetry of the Northeast Greenland continental shelf: Constraints on glacial and other processes

Evolution of surface velocities and ice discharge of Larsen B outlet glaciers from 1995 to 2013

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