The sedimentary cover of the Eastern Agulhas Ridge as seen in multichannel seismic reflection profiles: indications for changes in deep ocean circulation
The Agulhas Ridge forms an elongated part of the Agulhas-Falkland Fracture Zone (AFFZ) (43° S/9° E - 41° S/16° E) rising more than 2,000 m above the surrounding seafloor. Constituting a topographic barrier the ridge has a strong influence on the exchange of water masses between high and lower latitu...
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Deutsche Geophysikalischen Gesellschaft (DGG)
2014
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ftawi:oai:epic.awi.de:35288 2023-05-15T13:40:26+02:00 The sedimentary cover of the Eastern Agulhas Ridge as seen in multichannel seismic reflection profiles: indications for changes in deep ocean circulation Gruetzner, Jens Uenzelmann-Neben, Gabriele 2014-03 https://epic.awi.de/id/eprint/35288/ https://hdl.handle.net/10013/epic.43302 unknown Deutsche Geophysikalischen Gesellschaft (DGG) Gruetzner, J. orcid:0000-0001-5445-2393 and Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 (2014) The sedimentary cover of the Eastern Agulhas Ridge as seen in multichannel seismic reflection profiles: indications for changes in deep ocean circulation , 74. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG), Karlsruhe, 10 March 2014 - 13 March 2014 . hdl:10013/epic.43302 EPIC374. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG), Karlsruhe, 2014-03-10-2014-03-13Deutsche Geophysikalischen Gesellschaft (DGG) Conference notRev 2014 ftawi 2021-12-24T15:39:27Z The Agulhas Ridge forms an elongated part of the Agulhas-Falkland Fracture Zone (AFFZ) (43° S/9° E - 41° S/16° E) rising more than 2,000 m above the surrounding seafloor. Constituting a topographic barrier the ridge has a strong influence on the exchange of water masses between high and lower latitudes. While Antarctic Bottomwater (AABW) and Circumpolar Deepwater (CDW) originating in the Southern Ocean provide the inflow of cold water masses in larger water depths, the Agulhas leakage is the main source of warm and salty waters carried towards the Subpolar North Atlantic as the upper limb of the Meridional Overturning Circulation (MOC). In order to track past changes in this circulation pattern 5400 km of high-resolution multichannel seismic reflection data were acquired during RV Maria S. Merian cruise MSM 19/2 in the Agulhas Ridge area. Here we present processed profiles and a preliminary interpretation from the hitherto unexplored eastern plateau of the ridge and the area between the plateau and the Cape Rise Seamounts. Via crosscorrelation with ODP Leg 177 drillsites and a reconnaissance survey, prominent reflectors marking the early Oligocene, the middle Miocene and the base of the Pleistocene were identified. Sediment drifts deposited between these erosional surfaces indicate steady contour current acitivity at various depth levels. The chronological development of those drift structures studied both in 2d and 3d (depth to horizon and thickness maps) provide information on the displacement of depocenters and thus current pathways over time. Conference Object Antarc* Antarctic North Atlantic Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Southern Ocean Falkland Fracture Zone ENVELOPE(-41.000,-41.000,-49.333,-49.333) |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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description |
The Agulhas Ridge forms an elongated part of the Agulhas-Falkland Fracture Zone (AFFZ) (43° S/9° E - 41° S/16° E) rising more than 2,000 m above the surrounding seafloor. Constituting a topographic barrier the ridge has a strong influence on the exchange of water masses between high and lower latitudes. While Antarctic Bottomwater (AABW) and Circumpolar Deepwater (CDW) originating in the Southern Ocean provide the inflow of cold water masses in larger water depths, the Agulhas leakage is the main source of warm and salty waters carried towards the Subpolar North Atlantic as the upper limb of the Meridional Overturning Circulation (MOC). In order to track past changes in this circulation pattern 5400 km of high-resolution multichannel seismic reflection data were acquired during RV Maria S. Merian cruise MSM 19/2 in the Agulhas Ridge area. Here we present processed profiles and a preliminary interpretation from the hitherto unexplored eastern plateau of the ridge and the area between the plateau and the Cape Rise Seamounts. Via crosscorrelation with ODP Leg 177 drillsites and a reconnaissance survey, prominent reflectors marking the early Oligocene, the middle Miocene and the base of the Pleistocene were identified. Sediment drifts deposited between these erosional surfaces indicate steady contour current acitivity at various depth levels. The chronological development of those drift structures studied both in 2d and 3d (depth to horizon and thickness maps) provide information on the displacement of depocenters and thus current pathways over time. |
format |
Conference Object |
author |
Gruetzner, Jens Uenzelmann-Neben, Gabriele |
spellingShingle |
Gruetzner, Jens Uenzelmann-Neben, Gabriele The sedimentary cover of the Eastern Agulhas Ridge as seen in multichannel seismic reflection profiles: indications for changes in deep ocean circulation |
author_facet |
Gruetzner, Jens Uenzelmann-Neben, Gabriele |
author_sort |
Gruetzner, Jens |
title |
The sedimentary cover of the Eastern Agulhas Ridge as seen in multichannel seismic reflection profiles: indications for changes in deep ocean circulation |
title_short |
The sedimentary cover of the Eastern Agulhas Ridge as seen in multichannel seismic reflection profiles: indications for changes in deep ocean circulation |
title_full |
The sedimentary cover of the Eastern Agulhas Ridge as seen in multichannel seismic reflection profiles: indications for changes in deep ocean circulation |
title_fullStr |
The sedimentary cover of the Eastern Agulhas Ridge as seen in multichannel seismic reflection profiles: indications for changes in deep ocean circulation |
title_full_unstemmed |
The sedimentary cover of the Eastern Agulhas Ridge as seen in multichannel seismic reflection profiles: indications for changes in deep ocean circulation |
title_sort |
sedimentary cover of the eastern agulhas ridge as seen in multichannel seismic reflection profiles: indications for changes in deep ocean circulation |
publisher |
Deutsche Geophysikalischen Gesellschaft (DGG) |
publishDate |
2014 |
url |
https://epic.awi.de/id/eprint/35288/ https://hdl.handle.net/10013/epic.43302 |
long_lat |
ENVELOPE(-41.000,-41.000,-49.333,-49.333) |
geographic |
Antarctic Southern Ocean Falkland Fracture Zone |
geographic_facet |
Antarctic Southern Ocean Falkland Fracture Zone |
genre |
Antarc* Antarctic North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic North Atlantic Southern Ocean |
op_source |
EPIC374. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG), Karlsruhe, 2014-03-10-2014-03-13Deutsche Geophysikalischen Gesellschaft (DGG) |
op_relation |
Gruetzner, J. orcid:0000-0001-5445-2393 and Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 (2014) The sedimentary cover of the Eastern Agulhas Ridge as seen in multichannel seismic reflection profiles: indications for changes in deep ocean circulation , 74. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG), Karlsruhe, 10 March 2014 - 13 March 2014 . hdl:10013/epic.43302 |
_version_ |
1766133925305909248 |