Blar i forfatter "Lågstad, Petter Arthur"
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Formation of a large submarine crack during the final stage of retrogressive mass wasting on the continental slope offshore northern Norway
Laberg, Jan Sverre; Baeten, Nicole Jeanne; Lågstad, Petter Arthur; Forwick, Matthias; Vorren, Tore Ola (Journal article; Tidsskriftartikkel; Peer reviewed, 2013-08-30)High-resolution swath-bathymetry data integrated with sub-bottom profiles and single-channel seismics reveal an 18 km long, up to 1000 m wide and 10-15 m deep crack located approx. 4 km upslope from a slide scar on the continental slope off northern Norway. This crack is formed by subsidence of the sea-floor sediments to a depth of 120 m due to downslope movement of a ~80 km2 large sediment slab ... -
On the use of the HUGIN 1000 HUS Autonomous Underwater Vehicle for high resolution zooplankton measurements
Pedersen, Ole Petter; Gaardsted, Frank; Lågstad, Petter Arthur; Tande, Kurt Steinar (Journal article; Tidsskriftartikkel; Peer reviewed, 2010)This paper evaluates and tests the HUGIN 1000 HUS AUV as a carrier platform for the Laser Optical Plankton Counter (LOPC). The LOPC was mounted outside on top of the carrier platform, and the tests confirm that this concept did not create turbulence and zooplankton avoidance. A negligible velocity difference between the flow passing through the sampling tube and the AUV speed was detected. The ... -
Strategy for Detection and High-Resolution Characterization of Authigenic Carbonate Cold Seep Habitats Using Ships and Autonomous Underwater Vehicles on Glacially Influenced Terrain
Thorsnes, Terje; Chand, Shyam; Brunstad, Harald; Lepland, Aivo; Lågstad, Petter Arthur (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-11-26)Cold seep habitats with authigenic carbonates and associated chemosynthetic communities in glacially influenced terrains constitute an important part of the benthic ecosystems, but they are difficult to detect in large-scale seabed surveys. The areas they occupy are normally small, and survey platforms and sensors allowing high-resolution spatial characterization are necessary. We have developed a ...