Reconstruction of oceanic currents and climate change in the Transkei Basin, South African gateway
Reflection seismics, sediment drifts, bottom currents. - The region south of South Africa has been a crucial gateway for large scale Thermohaline Circulations since late Eocene times. Here, three of the most important currents for maintaining the global heat exchange, namely the warm and surface rel...
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ftsubggeo:oai:e-docs.geo-leo.de:11858/00-1735-0000-0001-31C6-4 2024-06-09T07:45:37+00:00 Reconstruction of oceanic currents and climate change in the Transkei Basin, South African gateway Schlüter, Philip 2007 application/pdf http://hdl.handle.net/11858/00-1735-0000-0001-31C6-4 https://doi.org/10.23689/fidgeo-315 deu ger Univ. Bremen Geophysik doi:10.23689/fidgeo-315 550931783 http://hdl.handle.net/11858/00-1735-0000-0001-31C6-4 http://e-docs.geo-leo.de/rights ddc:551.462 ddc:551.69 ddc:550 doc-type:book publishedVersion 2007 ftsubggeo https://doi.org/10.23689/fidgeo-315 2024-05-10T04:57:11Z Reflection seismics, sediment drifts, bottom currents. - The region south of South Africa has been a crucial gateway for large scale Thermohaline Circulations since late Eocene times. Here, three of the most important currents for maintaining the global heat exchange, namely the warm and surface related Agulhas Current (AC), and the cold and denser North Atlantic Deep Water (NADW) as well as the Atlantic Bottom Water (AABW), flow around South Africa. Due to the special tectonic and geologic situation, a huge amount of the deep and bottom water masses that flow around South Africa have to pass the narrow Agulhas Passage, located between the South African continental shelf and the submarine Agulhas Plateau. As a result, the sedimentary infill of the Transkei Basin, which is located east of the Agulhas Plateau, has been predominantly influenced by NADW and AABW activity since ~36 Ma. Via the analysis of this sedimentary infill, a palaeo current reconstruction of (proto-) NADW and (proto-) AABW revealed changing flow paths and flow strengths since then. These variations in current attributes were triggered by large scale effects, such as the opening of the Tasman Gateway and the Drake Passage in the Late Eocene, or the closure of the Isthmus of Panama in the Pliocene. A more detailed analysis of the Transkei Basin's depocentre locations and interface outlines resulted in a palaeo flow path reconstruction for this region. Moreover, palaeo climate conditions from the Late Cretaceous were partially reconstructed . thesis Book Drake Passage NADW North Atlantic Deep Water North Atlantic GEO-LEOe-docs (FID GEO) Drake Passage |
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language |
German |
topic |
ddc:551.462 ddc:551.69 ddc:550 |
spellingShingle |
ddc:551.462 ddc:551.69 ddc:550 Schlüter, Philip Reconstruction of oceanic currents and climate change in the Transkei Basin, South African gateway |
topic_facet |
ddc:551.462 ddc:551.69 ddc:550 |
description |
Reflection seismics, sediment drifts, bottom currents. - The region south of South Africa has been a crucial gateway for large scale Thermohaline Circulations since late Eocene times. Here, three of the most important currents for maintaining the global heat exchange, namely the warm and surface related Agulhas Current (AC), and the cold and denser North Atlantic Deep Water (NADW) as well as the Atlantic Bottom Water (AABW), flow around South Africa. Due to the special tectonic and geologic situation, a huge amount of the deep and bottom water masses that flow around South Africa have to pass the narrow Agulhas Passage, located between the South African continental shelf and the submarine Agulhas Plateau. As a result, the sedimentary infill of the Transkei Basin, which is located east of the Agulhas Plateau, has been predominantly influenced by NADW and AABW activity since ~36 Ma. Via the analysis of this sedimentary infill, a palaeo current reconstruction of (proto-) NADW and (proto-) AABW revealed changing flow paths and flow strengths since then. These variations in current attributes were triggered by large scale effects, such as the opening of the Tasman Gateway and the Drake Passage in the Late Eocene, or the closure of the Isthmus of Panama in the Pliocene. A more detailed analysis of the Transkei Basin's depocentre locations and interface outlines resulted in a palaeo flow path reconstruction for this region. Moreover, palaeo climate conditions from the Late Cretaceous were partially reconstructed . thesis |
format |
Book |
author |
Schlüter, Philip |
author_facet |
Schlüter, Philip |
author_sort |
Schlüter, Philip |
title |
Reconstruction of oceanic currents and climate change in the Transkei Basin, South African gateway |
title_short |
Reconstruction of oceanic currents and climate change in the Transkei Basin, South African gateway |
title_full |
Reconstruction of oceanic currents and climate change in the Transkei Basin, South African gateway |
title_fullStr |
Reconstruction of oceanic currents and climate change in the Transkei Basin, South African gateway |
title_full_unstemmed |
Reconstruction of oceanic currents and climate change in the Transkei Basin, South African gateway |
title_sort |
reconstruction of oceanic currents and climate change in the transkei basin, south african gateway |
publisher |
Univ. Bremen |
publishDate |
2007 |
url |
http://hdl.handle.net/11858/00-1735-0000-0001-31C6-4 https://doi.org/10.23689/fidgeo-315 |
geographic |
Drake Passage |
geographic_facet |
Drake Passage |
genre |
Drake Passage NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Drake Passage NADW North Atlantic Deep Water North Atlantic |
op_relation |
Geophysik doi:10.23689/fidgeo-315 550931783 http://hdl.handle.net/11858/00-1735-0000-0001-31C6-4 |
op_rights |
http://e-docs.geo-leo.de/rights |
op_doi |
https://doi.org/10.23689/fidgeo-315 |
_version_ |
1801375079709278208 |