1Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante, Sgonico, 34010, Italy
2Department of Geosciences/CESAM, University of Aveiro, Aveiro, 3810-193, Portugal
3College of Marine Science, University of South Florida, St. Petersburg, Florida 33701, USA
4Department of Geosciences, University of Alaska Fairbanks, Fairbanks, Alaska 99775, USA
5National Snow and Ice Data Center, University of Colorado, Boulder, Colorado 80309, USA
6British Antarctic Survey, Cambridge, Cambridgeshire, CB3 0ET, UK
7Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, 27568, Germany
8Korean Polar Research Institute, Incheon, 406-840, Republic of Korea
9Department of Earth and Atmospheric Sciences, University of Houston, Houston, Texas 77204, USA
10Departament d'Estratigrafia, Paleontologia i Geociències Marines/GRR Marine Geosciences, Universitat de Barcelona, Barcelona 08028, Spain
11Department of Earth Science, Rice University, Houston, Texas 77251, USA
Received: 13 Sep 2014 – Published in The Cryosphere Discuss.: 15 Oct 2014
Abstract. We present a new seafloor map for the northern Antarctic Peninsula (AP), including swath multibeam data sets from five national programs. Our map allows for the examination and interpretation of Last Glacial Maximum (LGM) paleo-ice-flow paths developed on the seafloor from the preservation of mega-scale glacial lineations, drumlinized features, and selective linear erosion. We combine this with terrestrial observations of flow direction to place constraints on ice divides and ice domes on the AP continental shelf during the LGM time interval. The results show a flow bifurcation as ice exits the Larsen B embayment. Flow emanating off the Seal Nunataks (including Robertson Island) is directed toward the southeast, then eastward as the flow transits toward the Robertson Trough. A second, stronger "streaming flow" is directed toward the southeast, then southward as ice overflowed the tip of the Jason Peninsula to reach the southern perimeter of the embayment. Our reconstruction also refines the extent of at least five other distinct paleo-ice-stream systems that, in turn, serve to delineate seven broad regions where contemporaneous ice domes must have been centered on the continental shelf at LGM. Our reconstruction is more detailed than other recent compilations because we followed specific ice-flow indicators and have kept tributary flow paths parallel.
Revised: 18 Feb 2015 – Accepted: 09 Mar 2015 – Published: 01 Apr 2015
Lavoie, C., Domack, E. W., Pettit, E. C., Scambos, T. A., Larter, R. D., Schenke, H.-W., Yoo, K. C., Gutt, J., Wellner, J., Canals, M., Anderson, J. B., and Amblas, D.: Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery, The Cryosphere, 9, 613-629, doi:10.5194/tc-9-613-2015, 2015.