Variability of benthic foraminifera north and south of the Denmark Strait
The Denmark Strait is a key area for the exchange of water masses and functions as a deep-water gateway between the Nordic Seas and the North Atlantic. Thus it constitutes an important part of the global thermohaline circulation (THC). The gateway aperture is influenced by eustatically and isostatic...
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ftunivkiel:oai:macau.uni-kiel.de:diss_mods_00001646 2024-06-23T07:52:21+00:00 Variability of benthic foraminifera north and south of the Denmark Strait Lorenz, Andrea Spindler, Michael Kuhnt, Wolfgang 2005 https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-16462 https://macau.uni-kiel.de/receive/diss_mods_00001646 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00001646/d1646.pdf eng eng https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-16462 https://macau.uni-kiel.de/receive/diss_mods_00001646 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00001646/d1646.pdf https://rightsstatements.org/page/InC/1.0/ info:eu-repo/semantics/openAccess ddc:570 thesis Denmark Strait benthic foraminifera faunal exchange community patterns Cibicidoides wuellerstorfi morphology mophometric measurements dissertation Text doc-type:PhDThesis 2005 ftunivkiel 2024-06-12T14:21:16Z The Denmark Strait is a key area for the exchange of water masses and functions as a deep-water gateway between the Nordic Seas and the North Atlantic. Thus it constitutes an important part of the global thermohaline circulation (THC). The gateway aperture is influenced by eustatically and isostatically controlled changes of the Denmark Strait sill and by alteration in density contrasts between the water masses in North and South. In order to determine the faunal exchange through the changing aperture, benthic foraminiferal assemblages were analysed. Eight surface sediment samples were taken along the East Greenland continental margin during the RV "Polarstern" cruise ARK XVIII/1 in July 2002 by means of a multicorer and a box corer respectively. Faunal assemblages of living (stained) and dead benthic foraminifera north and south of the Denmark Strait (980-2564 m water depth) were compared with each other. Northern and southern stations exhibit clear differences in abundances, diversities, number of species, and species composition. Due to strong bottom currents and low carbonate dissolution rates, high abundances with predominating calcareous species of dead and evidently allochthonous foraminifera were recorded south of the sill. Rather low abundances of dead autochthonous foraminiferal assemblages, containing mainly agglutinated species, were found north of the sill because of weak bottom currents and high carbonate dissolution rates. Southern stations showed a large portion of epibenthic species living as suspension feeders. In contrast endobenthic species living as substrate feeders dominated northern stations, pointing to lateral advection of food particles in South and sedimentation of food particles in North. Morphomertic measurements were performed on the high abundant foraminifer Cibicidoides wuellerstorfi. In order to supplement the data of the surface sediment samples and obtain morphometric data of glacial specimens, two long sediment cores were investigated as well. These cores were taken during ... Doctoral or Postdoctoral Thesis Denmark Strait East Greenland Greenland Nordic Seas North Atlantic MACAU: Open Access Repository of Kiel University Greenland |
institution |
Open Polar |
collection |
MACAU: Open Access Repository of Kiel University |
op_collection_id |
ftunivkiel |
language |
English |
topic |
ddc:570 thesis Denmark Strait benthic foraminifera faunal exchange community patterns Cibicidoides wuellerstorfi morphology mophometric measurements |
spellingShingle |
ddc:570 thesis Denmark Strait benthic foraminifera faunal exchange community patterns Cibicidoides wuellerstorfi morphology mophometric measurements Lorenz, Andrea Variability of benthic foraminifera north and south of the Denmark Strait |
topic_facet |
ddc:570 thesis Denmark Strait benthic foraminifera faunal exchange community patterns Cibicidoides wuellerstorfi morphology mophometric measurements |
description |
The Denmark Strait is a key area for the exchange of water masses and functions as a deep-water gateway between the Nordic Seas and the North Atlantic. Thus it constitutes an important part of the global thermohaline circulation (THC). The gateway aperture is influenced by eustatically and isostatically controlled changes of the Denmark Strait sill and by alteration in density contrasts between the water masses in North and South. In order to determine the faunal exchange through the changing aperture, benthic foraminiferal assemblages were analysed. Eight surface sediment samples were taken along the East Greenland continental margin during the RV "Polarstern" cruise ARK XVIII/1 in July 2002 by means of a multicorer and a box corer respectively. Faunal assemblages of living (stained) and dead benthic foraminifera north and south of the Denmark Strait (980-2564 m water depth) were compared with each other. Northern and southern stations exhibit clear differences in abundances, diversities, number of species, and species composition. Due to strong bottom currents and low carbonate dissolution rates, high abundances with predominating calcareous species of dead and evidently allochthonous foraminifera were recorded south of the sill. Rather low abundances of dead autochthonous foraminiferal assemblages, containing mainly agglutinated species, were found north of the sill because of weak bottom currents and high carbonate dissolution rates. Southern stations showed a large portion of epibenthic species living as suspension feeders. In contrast endobenthic species living as substrate feeders dominated northern stations, pointing to lateral advection of food particles in South and sedimentation of food particles in North. Morphomertic measurements were performed on the high abundant foraminifer Cibicidoides wuellerstorfi. In order to supplement the data of the surface sediment samples and obtain morphometric data of glacial specimens, two long sediment cores were investigated as well. These cores were taken during ... |
author2 |
Spindler, Michael Kuhnt, Wolfgang |
format |
Doctoral or Postdoctoral Thesis |
author |
Lorenz, Andrea |
author_facet |
Lorenz, Andrea |
author_sort |
Lorenz, Andrea |
title |
Variability of benthic foraminifera north and south of the Denmark Strait |
title_short |
Variability of benthic foraminifera north and south of the Denmark Strait |
title_full |
Variability of benthic foraminifera north and south of the Denmark Strait |
title_fullStr |
Variability of benthic foraminifera north and south of the Denmark Strait |
title_full_unstemmed |
Variability of benthic foraminifera north and south of the Denmark Strait |
title_sort |
variability of benthic foraminifera north and south of the denmark strait |
publishDate |
2005 |
url |
https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-16462 https://macau.uni-kiel.de/receive/diss_mods_00001646 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00001646/d1646.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Denmark Strait East Greenland Greenland Nordic Seas North Atlantic |
genre_facet |
Denmark Strait East Greenland Greenland Nordic Seas North Atlantic |
op_relation |
https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-16462 https://macau.uni-kiel.de/receive/diss_mods_00001646 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00001646/d1646.pdf |
op_rights |
https://rightsstatements.org/page/InC/1.0/ info:eu-repo/semantics/openAccess |
_version_ |
1802643630312128512 |