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A deep scattering layer under the North Pole pack ice by Snoeijs-Leijonmalm, Pauline (author);Gjøsæter, Harald (author);Ingvaldsen, Randi B. (author);Knutsen, Tor (author);Korneliussen, Rolf (author);Ona, Egil (author);Skjoldal, Hein Rune (author);Stranne, Christian (author);Mayer, Larry (author);Jakobsson, Martin (author);Gårdfeldt, Katarina (author) is a Earth and Planetary Sciences article available to read on EtoBox.

What is A deep scattering layer under the North Pole pack ice about?

The 3.3 million km 2 marine ecosystem around the North Pole, defined as the Central Arctic Ocean (CAO), is a blind spot on the map of the world's fish stocks. The CAO essentially comprises the permanently ice-covered deep basins and ridges outside the continental shelves, and is only accessible by ice-breakers. Traditional trawling for assessing fish stocks is impossible under the thick pack ice, and coherent hydroacoustic surveys are unachievable due to ice-breaking noise. Consequently, nothing is known about the existence of any pelagic fish stocks in the CAO, although juveniles of Boreogadus saida richly occur at the surface associated with the sea ice and iceassociated Arctogadus glacialis has been reported as well. We here present a first indication of a possible mesopelagic fish stock in the CAO. We had the opportunity to analyse a geophysical hydroacoustic data set with 13 time windows of usable acoustic data over a transect from 84.4 • N in the Nansen Basin, across the North Pole (90.0 • N), to 82.4 • N in the Canada Basin. We discovered a deep scattering layer (DSL), suggesting the presence of zooplankton and fish, at 300-600 m of depth in the Atlantic water layer of the C

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Author

Snoeijs-Leijonmalm, Pauline (author);Gjøsæter, Harald (author);Ingvaldsen, Randi B. (author);Knutsen, Tor (author);Korneliussen, Rolf (author);Ona, Egil (author);Skjoldal, Hein Rune (author);Stranne, Christian (author);Mayer, Larry (author);Jakobsson, Martin (author);Gårdfeldt, Katarina (author)

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)