Benthic-pelagic coupling in the Greenland-Norwegian Sea and its effect on the geological record.

Graf, Gerhard, Gerlach, Sebastian A., Linke, Peter , Queisser, Wolfgang, Ritzrau, W., Scheltz, A., Thomsen, L. and Witte, Ursula (1995) Benthic-pelagic coupling in the Greenland-Norwegian Sea and its effect on the geological record. Open Access Geologische Rundschau, 84 . pp. 49-58. DOI 10.1007/BF00192241.

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Abstract

The sedimentation pattern of organic material in the Greenland-Norwegian Sea is reflected in the surface sediments, although less than 0.5% of the organic matter is buried in the sediment. Maximum fluxes and benthic responses are observed during June and/or August/September, following the pattern of export production in the pelagial zone. The annual remineralization rate on the Vøring Plateau is 3.0 g C m−2 a −1 Freshly settled phytodetritus, as detected by chlorophyll measurements, is rapidly mixed into the sediment and decomposed. It stimulates the activity of benthic organisms, especially foraminifera. The mixing coefficient for this material is D b=0.2 cm2 d−1, which is two to three orders of magnitude higher than that estimated from radiotracer methods. The effect on the geological record, however, is likely to be small. Chlorophyll-containing particles are at first very evenly distributed on the seafloor. After partial decomposition and resuspension, a secondary redistribution of particles occurs which can result in the formation of a high accumulation area, with an up to 80-fold increase in the sedimentation rate by lateral advection. This is mainly due to physical processes, because biodeposition mediated by benthic animals increases sedimentation by only a factor of two or three.

Document Type: Article
Keywords: Benthic-pelagic coupling, Greenland-Norwegian Sea, Remineralization, Bioturbation, Sediment accumulation, RV Poseidon, RV Meteor, POS119, POS128, POS137, POS141/2, M2/1, M7/4, M10/3, M13/1, M17/1, M21/5
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > Institute for Marine Science Kiel
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/BF00192241
ISSN: 0016-7835
Expeditions/Models/Experiments:
Date Deposited: 18 Feb 2008 17:27
Last Modified: 23 Sep 2019 19:16
URI: http://oceanrep.geomar.de/id/eprint/8174

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