Initial Results from Seafloor Characterization of Arctic and Antarctic Margins using Multibeam Backscatter
2012 (English)In: Arctic Palaeoclimate and its Extremes: APEX VI / [ed] Ninna Immonen, Martin Jakobsson, Juha Pekka Lunkka, Kari Strand, Oulu: University of Oulu , 2012, 51-51 p.Conference paper, Poster (Other academic)
The seafloor of high-latitude Polar margins is characterized by various submarine glacigenic landforms whose shape and texture were created, and subsequently modified, by ice. These glaciogenic landforms together with deposited seafloor sediments serve as a record of the past glacial history. The Multibeam Echo Sounder (MBES) technology provides a tool to map and study submarine glaciogenic landforms and seafloor texture. MBES bathymetric images have afforded scientists a way to understand many glacial processes such as iceberg movements, advance and retreat patterns of ice sheets, and polar underwater currents, among others. Aside from measuring the bathymetry, MBES systems also record the returned intensity, or backscatter, of the acoustic pulse. Recent developments have shown that the backscatter information can be used to distinguish/classify differences in the surface sediment types. Here we present the preliminary results of an analysis of backscatter data aimed to characterize sediment types at locations of the Arctic and Antarctic margins mapped with Swedish icebreaker Oden and the installed Kongsberg EM122, 12 kHz, deep water MBES. We apply the Angular Range Analysis (ARA) method that is included in the Geocoder Backscatter processing algorithm [Fonseca and Mayer, 2007]. The results are correlated with other geophysical data and core samples to ground-truth the resulting seafloor maps.
Place, publisher, year, edition, pages
Oulu: University of Oulu , 2012. 51-51 p.
Research subject Geology
IdentifiersURN: urn:nbn:se:su:diva-86378ISBN: 978-951-42-9830-1OAI: oai:DiVA.org:su-86378DiVA: diva2:586809
APEX Sixth International Conference and Workshop: Quaternary Glacial and Climate Extremes, May 15-18, 2012, Oulu, Finland