Planktonic foraminifera Mg/Ca paleotemperatures and oxygen isotopes of ODP Hole 175-1078C
High resolution planktonic foraminifera Mg/Ca paleotemperatures and oxygen isotopes of seawater of Ocean Drilling Program (ODP) Site 1078 (off Angola) have been reconstructed and reveal insights into the seasonal thermal evolution of the Angola Current (AC), the Angola-Benguela Front (ABF), and the...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.772226 2024-09-15T18:22:03+00:00 Planktonic foraminifera Mg/Ca paleotemperatures and oxygen isotopes of ODP Hole 175-1078C Hessler, Ines Steinke, Stephan Groeneveld, Jeroen Dupont, Lydie M Wefer, Gerold LATITUDE: -11.920770 * LONGITUDE: 13.400250 * DATE/TIME START: 1997-09-03T18:10:00 * DATE/TIME END: 1997-09-04T06:05:00 2011 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.772226 https://doi.org/10.1594/PANGAEA.772226 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.772226 https://doi.org/10.1594/PANGAEA.772226 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Hessler, Ines; Steinke, Stephan; Groeneveld, Jeroen; Dupont, Lydie M; Wefer, Gerold (2011): Impact of abrupt climate change in the tropical southeast Atlantic during Marine Isotope Stage (MIS) 3. Paleoceanography, 26, PA4209, https://doi.org/10.1029/2011PA002118 175-1078C Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP dataset publication series 2011 ftpangaea https://doi.org/10.1594/PANGAEA.77222610.1029/2011PA002118 2024-08-21T00:02:25Z High resolution planktonic foraminifera Mg/Ca paleotemperatures and oxygen isotopes of seawater of Ocean Drilling Program (ODP) Site 1078 (off Angola) have been reconstructed and reveal insights into the seasonal thermal evolution of the Angola Current (AC), the Angola-Benguela Front (ABF), and the Benguela Current (BC) during the last glacial (50-23.5 ka BP). Special emphasis is put on time intervals possibly associated with the North Atlantic Heinrich Stadials (HS), which are thought to lead to an accumulation of heat in the South Atlantic due to a reduction of the Atlantic Meridional Overturning Circulation (AMOC). Within dating uncertainties, Globigerinoides ruber (pink) Mg/Ca-based sea surface temperature (SST) estimates that represent southern hemisphere summer surface conditions show several warming episodes that coincide with North Atlantic HS, thus supporting the concept of the bipolar thermal seesaw. In contrast, the Mg/Ca-based temperatures of Globigerina bulloides, representing the SST of the ABF/BC system during southern hemisphere winter, show no obvious response to the North Atlantic HS in the study area. We suggest that surface water cooling during the winter season is due to enhanced upwelling or upwelling of colder water masses which has most likely mitigated a warming of the ABF/BC system during HS. We further speculate that the seasonal asymmetry in our SST record results from seasonal differences in the dominance of atmospheric and oceanic teleconnections during periods of northern high latitude cooling. Other/Unknown Material North Atlantic Planktonic foraminifera South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(13.400250,13.400250,-11.920770,-11.920770) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
175-1078C Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP |
spellingShingle |
175-1078C Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP Hessler, Ines Steinke, Stephan Groeneveld, Jeroen Dupont, Lydie M Wefer, Gerold Planktonic foraminifera Mg/Ca paleotemperatures and oxygen isotopes of ODP Hole 175-1078C |
topic_facet |
175-1078C Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP |
description |
High resolution planktonic foraminifera Mg/Ca paleotemperatures and oxygen isotopes of seawater of Ocean Drilling Program (ODP) Site 1078 (off Angola) have been reconstructed and reveal insights into the seasonal thermal evolution of the Angola Current (AC), the Angola-Benguela Front (ABF), and the Benguela Current (BC) during the last glacial (50-23.5 ka BP). Special emphasis is put on time intervals possibly associated with the North Atlantic Heinrich Stadials (HS), which are thought to lead to an accumulation of heat in the South Atlantic due to a reduction of the Atlantic Meridional Overturning Circulation (AMOC). Within dating uncertainties, Globigerinoides ruber (pink) Mg/Ca-based sea surface temperature (SST) estimates that represent southern hemisphere summer surface conditions show several warming episodes that coincide with North Atlantic HS, thus supporting the concept of the bipolar thermal seesaw. In contrast, the Mg/Ca-based temperatures of Globigerina bulloides, representing the SST of the ABF/BC system during southern hemisphere winter, show no obvious response to the North Atlantic HS in the study area. We suggest that surface water cooling during the winter season is due to enhanced upwelling or upwelling of colder water masses which has most likely mitigated a warming of the ABF/BC system during HS. We further speculate that the seasonal asymmetry in our SST record results from seasonal differences in the dominance of atmospheric and oceanic teleconnections during periods of northern high latitude cooling. |
format |
Other/Unknown Material |
author |
Hessler, Ines Steinke, Stephan Groeneveld, Jeroen Dupont, Lydie M Wefer, Gerold |
author_facet |
Hessler, Ines Steinke, Stephan Groeneveld, Jeroen Dupont, Lydie M Wefer, Gerold |
author_sort |
Hessler, Ines |
title |
Planktonic foraminifera Mg/Ca paleotemperatures and oxygen isotopes of ODP Hole 175-1078C |
title_short |
Planktonic foraminifera Mg/Ca paleotemperatures and oxygen isotopes of ODP Hole 175-1078C |
title_full |
Planktonic foraminifera Mg/Ca paleotemperatures and oxygen isotopes of ODP Hole 175-1078C |
title_fullStr |
Planktonic foraminifera Mg/Ca paleotemperatures and oxygen isotopes of ODP Hole 175-1078C |
title_full_unstemmed |
Planktonic foraminifera Mg/Ca paleotemperatures and oxygen isotopes of ODP Hole 175-1078C |
title_sort |
planktonic foraminifera mg/ca paleotemperatures and oxygen isotopes of odp hole 175-1078c |
publisher |
PANGAEA |
publishDate |
2011 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.772226 https://doi.org/10.1594/PANGAEA.772226 |
op_coverage |
LATITUDE: -11.920770 * LONGITUDE: 13.400250 * DATE/TIME START: 1997-09-03T18:10:00 * DATE/TIME END: 1997-09-04T06:05:00 |
long_lat |
ENVELOPE(13.400250,13.400250,-11.920770,-11.920770) |
genre |
North Atlantic Planktonic foraminifera South Atlantic Ocean |
genre_facet |
North Atlantic Planktonic foraminifera South Atlantic Ocean |
op_source |
Supplement to: Hessler, Ines; Steinke, Stephan; Groeneveld, Jeroen; Dupont, Lydie M; Wefer, Gerold (2011): Impact of abrupt climate change in the tropical southeast Atlantic during Marine Isotope Stage (MIS) 3. Paleoceanography, 26, PA4209, https://doi.org/10.1029/2011PA002118 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.772226 https://doi.org/10.1594/PANGAEA.772226 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.77222610.1029/2011PA002118 |
_version_ |
1810461350822936576 |