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Bathymetry and glacial geomorphology in the sub-Antarctic Auckland Islands

Published online by Cambridge University Press:  22 October 2018

Emily J. Tidey Open the ORCID record for Emily J. Tidey [Opens in a new window]  and
Christina L. Hulbe
Emily J. Tidey*
Affiliation:
School of Surveying/Te Kura Kairūri, University of Otago/Te Whare Wānanga o Otāgo, 310 Castle Street, Dunedin/Ōtepoti, New Zealand/Aotearoa
Christina L. Hulbe
Affiliation:
School of Surveying/Te Kura Kairūri, University of Otago/Te Whare Wānanga o Otāgo, 310 Castle Street, Dunedin/Ōtepoti, New Zealand/Aotearoa
*
emily.tidey@otago.ac.nz
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Abstract

New high-resolution multibeam swath bathymetry along the east coast of the Auckland Islands is combined with subaerial topography and evaluated in the context of Quaternary glaciation of the islands. The marine geomorphology represents a mixture of past and current processes so that submerged glacial features are more evident in some areas than others. Fjords in the central and southern parts of the coastline are characterized by well-preserved terminal moraines and other glacial features while fjords to the north tend to have more subdued glacial features and a smoother seabed. This is the farthest north record yet established of extensive sub-Antarctic glaciation, relative to the position of the modern sub-Antarctic and Polar Front. This is the first analysis of detailed sea floor geomorphology in the area and provides a starting point for new studies of paleoclimate and past glaciations.

Keywords

glaciationmultibeamQuaternarySouthern Oceansubsea geomorphology
Type
Earth Sciences
Information
Antarctic Science , Volume 30 , Issue 6 , December 2018 , pp. 357 - 370
Copyright
© Antarctic Science Ltd 2018 

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