Short-term climate variability in the North Atlantic during the onset of northern hemisphere glaciation and the final closure of the Panamanian seaways, 3.3 - 2.5 Ma.
Long- and short-term Late Pliocene climate variations were studied at North Atlantic Sites (S.) ODP 984 and DSDP 609, supplemented by published records from S. 907 and S. 610. Foraminiferal ?18O records provided the base for stable-isotope stratigraphy. Deepwater and sea surface temperatures (SST) w...
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ftunivkiel:oai:macau.uni-kiel.de:diss_mods_00001692 2024-06-23T07:53:21+00:00 Short-term climate variability in the North Atlantic during the onset of northern hemisphere glaciation and the final closure of the Panamanian seaways, 3.3 - 2.5 Ma. Bartoli, Gretta Sarnthein, Michael Weinelt, Mara 2005 https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-16924 https://macau.uni-kiel.de/receive/diss_mods_00001692 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00001692/d1692.pdf eng eng https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-16924 https://macau.uni-kiel.de/receive/diss_mods_00001692 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00001692/d1692.pdf https://rightsstatements.org/page/InC/1.0/ info:eu-repo/semantics/openAccess ddc:550 thesis Late Pliocene Foraminiferal Mg/Ca Ocean gateways northern hemisphere glaciation sub-millennial scale climate variability Atlantischer Ozean <Nord> Eiszeit Klimaänderung dissertation Text doc-type:PhDThesis 2005 ftunivkiel 2024-06-12T14:21:16Z Long- and short-term Late Pliocene climate variations were studied at North Atlantic Sites (S.) ODP 984 and DSDP 609, supplemented by published records from S. 907 and S. 610. Foraminiferal ?18O records provided the base for stable-isotope stratigraphy. Deepwater and sea surface temperatures (SST) were reconstructed from Mg/Ca values of benthic and planktic foraminifera. Epibenthic ?___ variations were used as tracers of deepwater ventilation. Counts of ice rafted detritus served to trace back the initiation of the Greenland ice-sheet. In addition, counts of benthic foraminifera (M. Weinelt) served as tracer for primary production. Chapter 1 shows that the onset of northern hemisphere glaciation (NHG), in particular on Greenland occurred only slighty after, hence as a result of the final closure of the Central American Seaways, which led to an increase in Caribbean sea surface salinity by up to 0.9‰. A first step occurred 2.95-2.82 Ma (marine istotope stage – MIS – G16-11), a second step 2.75-2.73 Ma (MIS G6), in total amounting to ~90 m of glacial sea-level fall. The first step was coeval with an intensified Atlantic thermohaline circulation (0.2-0.3‰ increase in benthic ?13C; 2-3°C increase in SST), leading to enhanced snow precipitation in northern high-latitudes. Chapter 2 documents millennial-scale climate variations prior and after the onset of NHG at Site 984 to test the hypothesis that Dansgaard-Oeschger (DO) cycles of 1470 yr (and their multiples) are linked to ice-breakouts and meltwater incursions from northern hemisphere ice-sheets. On the long term, periodicities of 1300, 950, and 450 yr prevail, which closely resemble solar cycles of the Holocene. The same applies to selected glacial stages prior to the onset of NHG and to interglacial stages in general. However, glacial stages after the onset of NHG (MIS G14, G6, and 104) show periodicities near 1.47, 2.9 and 4.4 kyr, DO-like periodicities which thus occur in the presence of large northern hemisphere ice-sheets only, and as result of ice ... Doctoral or Postdoctoral Thesis Greenland Ice Sheet 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:550 thesis Late Pliocene Foraminiferal Mg/Ca Ocean gateways northern hemisphere glaciation sub-millennial scale climate variability Atlantischer Ozean <Nord> Eiszeit Klimaänderung |
spellingShingle |
ddc:550 thesis Late Pliocene Foraminiferal Mg/Ca Ocean gateways northern hemisphere glaciation sub-millennial scale climate variability Atlantischer Ozean <Nord> Eiszeit Klimaänderung Bartoli, Gretta Short-term climate variability in the North Atlantic during the onset of northern hemisphere glaciation and the final closure of the Panamanian seaways, 3.3 - 2.5 Ma. |
topic_facet |
ddc:550 thesis Late Pliocene Foraminiferal Mg/Ca Ocean gateways northern hemisphere glaciation sub-millennial scale climate variability Atlantischer Ozean <Nord> Eiszeit Klimaänderung |
description |
Long- and short-term Late Pliocene climate variations were studied at North Atlantic Sites (S.) ODP 984 and DSDP 609, supplemented by published records from S. 907 and S. 610. Foraminiferal ?18O records provided the base for stable-isotope stratigraphy. Deepwater and sea surface temperatures (SST) were reconstructed from Mg/Ca values of benthic and planktic foraminifera. Epibenthic ?___ variations were used as tracers of deepwater ventilation. Counts of ice rafted detritus served to trace back the initiation of the Greenland ice-sheet. In addition, counts of benthic foraminifera (M. Weinelt) served as tracer for primary production. Chapter 1 shows that the onset of northern hemisphere glaciation (NHG), in particular on Greenland occurred only slighty after, hence as a result of the final closure of the Central American Seaways, which led to an increase in Caribbean sea surface salinity by up to 0.9‰. A first step occurred 2.95-2.82 Ma (marine istotope stage – MIS – G16-11), a second step 2.75-2.73 Ma (MIS G6), in total amounting to ~90 m of glacial sea-level fall. The first step was coeval with an intensified Atlantic thermohaline circulation (0.2-0.3‰ increase in benthic ?13C; 2-3°C increase in SST), leading to enhanced snow precipitation in northern high-latitudes. Chapter 2 documents millennial-scale climate variations prior and after the onset of NHG at Site 984 to test the hypothesis that Dansgaard-Oeschger (DO) cycles of 1470 yr (and their multiples) are linked to ice-breakouts and meltwater incursions from northern hemisphere ice-sheets. On the long term, periodicities of 1300, 950, and 450 yr prevail, which closely resemble solar cycles of the Holocene. The same applies to selected glacial stages prior to the onset of NHG and to interglacial stages in general. However, glacial stages after the onset of NHG (MIS G14, G6, and 104) show periodicities near 1.47, 2.9 and 4.4 kyr, DO-like periodicities which thus occur in the presence of large northern hemisphere ice-sheets only, and as result of ice ... |
author2 |
Sarnthein, Michael Weinelt, Mara |
format |
Doctoral or Postdoctoral Thesis |
author |
Bartoli, Gretta |
author_facet |
Bartoli, Gretta |
author_sort |
Bartoli, Gretta |
title |
Short-term climate variability in the North Atlantic during the onset of northern hemisphere glaciation and the final closure of the Panamanian seaways, 3.3 - 2.5 Ma. |
title_short |
Short-term climate variability in the North Atlantic during the onset of northern hemisphere glaciation and the final closure of the Panamanian seaways, 3.3 - 2.5 Ma. |
title_full |
Short-term climate variability in the North Atlantic during the onset of northern hemisphere glaciation and the final closure of the Panamanian seaways, 3.3 - 2.5 Ma. |
title_fullStr |
Short-term climate variability in the North Atlantic during the onset of northern hemisphere glaciation and the final closure of the Panamanian seaways, 3.3 - 2.5 Ma. |
title_full_unstemmed |
Short-term climate variability in the North Atlantic during the onset of northern hemisphere glaciation and the final closure of the Panamanian seaways, 3.3 - 2.5 Ma. |
title_sort |
short-term climate variability in the north atlantic during the onset of northern hemisphere glaciation and the final closure of the panamanian seaways, 3.3 - 2.5 ma. |
publishDate |
2005 |
url |
https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-16924 https://macau.uni-kiel.de/receive/diss_mods_00001692 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00001692/d1692.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet North Atlantic |
genre_facet |
Greenland Ice Sheet North Atlantic |
op_relation |
https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-16924 https://macau.uni-kiel.de/receive/diss_mods_00001692 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00001692/d1692.pdf |
op_rights |
https://rightsstatements.org/page/InC/1.0/ info:eu-repo/semantics/openAccess |
_version_ |
1802644944722067456 |