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The Fugløy Reef at 70°N; acoustic signature, geologic, geomorphologic and oceanographic setting

The Fugløy Reef at 70°N; acoustic signature, geologic, geomorphologic and oceanographic setting
The Fugløy Reef at 70°N; acoustic signature, geologic, geomorphologic and oceanographic setting
This is the first in-depth study of a cluster of cold-water coral reefs, the Fugløy Reefs, found at 70°N on the Norwegian margin. Combining high-resolution seismic reflection data, side-scan sonar, video-images, and oceanographic measurements reveals the geologic, geomorphologic and oceanographic setting in which the reefs occur. The reefs consist mainly of the scleractinian ahermatypic Lophelia pertusa, and exist below the thermocline at water depths between 140 m and 190 m. The reefs appear as cone-shaped, acoustically transparent features on seismic reflection data, consistently located in places characterized by the availability of hard substrate, high relief, and periodical exposure to high tidal currents (>30 cm/s). These currents transport water of the Norwegian Atlantic Current to the reefs from an area with fluid expulsion-related pockmarks. The spatial relationship between reef, pockmark locations, and current directions suggests that seepage of biogenic gas might be a catalyst to reef growth. With a height of more than 40 m some of the Fugløy reefs are among the highest reported from the Norwegian Margin. This indicates highly favourable growth conditions, and conservative estimates indicate a net growth rate for the reefs of ~5 mm/year. We expect that cold-water reefs will be found further north along the Barents Sea margin as general awareness on the geophysical signature and appearance of the reefs increases, because all known factors involved in reef establishment and growth are within the required intervals also further north.
1437-3254
201-213
Lindberg, B.
9b4dcd62-8c6f-459f-9ba4-3545a49fe9bf
Berndt, C.
231544d4-f681-44a2-ae6e-74385e588bf6
Mienert, J.
90ba1f28-5249-4663-ad09-b6abc8b46068
Lindberg, B.
9b4dcd62-8c6f-459f-9ba4-3545a49fe9bf
Berndt, C.
231544d4-f681-44a2-ae6e-74385e588bf6
Mienert, J.
90ba1f28-5249-4663-ad09-b6abc8b46068

Lindberg, B., Berndt, C. and Mienert, J. (2007) The Fugløy Reef at 70°N; acoustic signature, geologic, geomorphologic and oceanographic setting. International Journal of Earth Sciences, 96 (1), 201-213. (doi:10.1007/s00531-005-0495-y).

Record type: Article

Abstract

This is the first in-depth study of a cluster of cold-water coral reefs, the Fugløy Reefs, found at 70°N on the Norwegian margin. Combining high-resolution seismic reflection data, side-scan sonar, video-images, and oceanographic measurements reveals the geologic, geomorphologic and oceanographic setting in which the reefs occur. The reefs consist mainly of the scleractinian ahermatypic Lophelia pertusa, and exist below the thermocline at water depths between 140 m and 190 m. The reefs appear as cone-shaped, acoustically transparent features on seismic reflection data, consistently located in places characterized by the availability of hard substrate, high relief, and periodical exposure to high tidal currents (>30 cm/s). These currents transport water of the Norwegian Atlantic Current to the reefs from an area with fluid expulsion-related pockmarks. The spatial relationship between reef, pockmark locations, and current directions suggests that seepage of biogenic gas might be a catalyst to reef growth. With a height of more than 40 m some of the Fugløy reefs are among the highest reported from the Norwegian Margin. This indicates highly favourable growth conditions, and conservative estimates indicate a net growth rate for the reefs of ~5 mm/year. We expect that cold-water reefs will be found further north along the Barents Sea margin as general awareness on the geophysical signature and appearance of the reefs increases, because all known factors involved in reef establishment and growth are within the required intervals also further north.

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Published date: February 2007

Identifiers

Local EPrints ID: 50397
URI: http://eprints.soton.ac.uk/id/eprint/50397
ISSN: 1437-3254
PURE UUID: 39b607f0-3271-49a9-a197-fca914a79d7a

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Date deposited: 22 Feb 2008
Last modified: 13 Mar 2019 20:51

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