Distribution of planktonic foraminifera and paleotemperature reconstruction for the Subantarctic Zone of the South Atlantic
Pleistocene summer sea-surface temperatures (SSST) have been reconstructed on a composite core section recovered in the Subantarctic Zone of the Southern Ocean from planktonic foraminifers applying the Modern Analog Technique. The composite consists of Core PS2489-2 and the sections recovered at ODP...
Main Authors: | , |
---|---|
Format: | Other/Unknown Material |
Language: | English |
Published: |
PANGAEA
2002
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.706226 https://doi.org/10.1594/PANGAEA.706226 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.706226 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.706226 2024-09-15T18:31:07+00:00 Distribution of planktonic foraminifera and paleotemperature reconstruction for the Subantarctic Zone of the South Atlantic Becquey, Sabine Gersonde, Rainer LATITUDE: -42.913617 * LONGITUDE: 8.899817 * DATE/TIME START: 1997-12-25T00:00:00 * DATE/TIME END: 1997-12-25T00:00:00 2002 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.706226 https://doi.org/10.1594/PANGAEA.706226 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.706226 https://doi.org/10.1594/PANGAEA.706226 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Becquey, Sabine; Gersonde, Rainer (2002): Past hydrographic and climatic changes in the Subantarctic Zone of the South Atlantic - The Pleistocene record from ODP Site 1090. Palaeogeography, Palaeoclimatology, Palaeoecology, 182(3-4), 221-239, https://doi.org/10.1016/S0031-0182(01)00497-7 177-1090 COMPCORE Composite Core Joides Resolution Leg177 Ocean Drilling Program ODP South Atlantic Ocean dataset publication series 2002 ftpangaea https://doi.org/10.1594/PANGAEA.70622610.1016/S0031-0182(01)00497-7 2024-07-24T02:31:42Z Pleistocene summer sea-surface temperatures (SSST) have been reconstructed on a composite core section recovered in the Subantarctic Zone of the Southern Ocean from planktonic foraminifers applying the Modern Analog Technique. The composite consists of Core PS2489-2 and the sections recovered at ODP Site 1090, and documents the last 1.83 Ma. Three distinct climatic periods can be identified that mirror the Pleistocene development of the Southern Ocean hydrography. Cold climatic conditions prevailed at 43°S during glacial as well as during interglacial periods during the early Pleistocene (1.83-0.87 Ma), indicating a northward shift of isotherms that characterize the present-day Polar Front Zone by about 7° of latitude. Evidence shows a strong linkage between Southern Ocean and low latitude climate during that interval time. Between the Mid-Pleistocene Revolution (ca. 0.9 Ma) and the Mid-Brunhes Event (ca. 0.4 Ma), we observe higher amplitude fluctuations in the SSST between glacial and interglacial periods, corresponding to the temperature range between the present Polar Front and Subantarctic Front. These climatic variations have been related to changes in the northern hemisphere ice sheets. The past 0.4 Ma are characterized by strong SSST variations, of up to 8°C, between glacials and interglacials. Only during the climatic optima (stages 11.3, 9.3, 7.5, 7.1, 5.5, and the early Holocene), SSST exceeded present SSST at the core locality (10.2°C). Although the carbonate dissolution record exhibits high variability during the Pleistocene, it can be shown that SSST estimates were not significantly biased. The Mid-Brunhes dissolution cycle as well as the Mid-Pleistocene enhanced carbonate preservation appear to belong to a global long-term variability in carbonate preservation. Other/Unknown Material Planktonic foraminifera South Atlantic Ocean Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(8.899817,8.899817,-42.913617,-42.913617) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
177-1090 COMPCORE Composite Core Joides Resolution Leg177 Ocean Drilling Program ODP South Atlantic Ocean |
spellingShingle |
177-1090 COMPCORE Composite Core Joides Resolution Leg177 Ocean Drilling Program ODP South Atlantic Ocean Becquey, Sabine Gersonde, Rainer Distribution of planktonic foraminifera and paleotemperature reconstruction for the Subantarctic Zone of the South Atlantic |
topic_facet |
177-1090 COMPCORE Composite Core Joides Resolution Leg177 Ocean Drilling Program ODP South Atlantic Ocean |
description |
Pleistocene summer sea-surface temperatures (SSST) have been reconstructed on a composite core section recovered in the Subantarctic Zone of the Southern Ocean from planktonic foraminifers applying the Modern Analog Technique. The composite consists of Core PS2489-2 and the sections recovered at ODP Site 1090, and documents the last 1.83 Ma. Three distinct climatic periods can be identified that mirror the Pleistocene development of the Southern Ocean hydrography. Cold climatic conditions prevailed at 43°S during glacial as well as during interglacial periods during the early Pleistocene (1.83-0.87 Ma), indicating a northward shift of isotherms that characterize the present-day Polar Front Zone by about 7° of latitude. Evidence shows a strong linkage between Southern Ocean and low latitude climate during that interval time. Between the Mid-Pleistocene Revolution (ca. 0.9 Ma) and the Mid-Brunhes Event (ca. 0.4 Ma), we observe higher amplitude fluctuations in the SSST between glacial and interglacial periods, corresponding to the temperature range between the present Polar Front and Subantarctic Front. These climatic variations have been related to changes in the northern hemisphere ice sheets. The past 0.4 Ma are characterized by strong SSST variations, of up to 8°C, between glacials and interglacials. Only during the climatic optima (stages 11.3, 9.3, 7.5, 7.1, 5.5, and the early Holocene), SSST exceeded present SSST at the core locality (10.2°C). Although the carbonate dissolution record exhibits high variability during the Pleistocene, it can be shown that SSST estimates were not significantly biased. The Mid-Brunhes dissolution cycle as well as the Mid-Pleistocene enhanced carbonate preservation appear to belong to a global long-term variability in carbonate preservation. |
format |
Other/Unknown Material |
author |
Becquey, Sabine Gersonde, Rainer |
author_facet |
Becquey, Sabine Gersonde, Rainer |
author_sort |
Becquey, Sabine |
title |
Distribution of planktonic foraminifera and paleotemperature reconstruction for the Subantarctic Zone of the South Atlantic |
title_short |
Distribution of planktonic foraminifera and paleotemperature reconstruction for the Subantarctic Zone of the South Atlantic |
title_full |
Distribution of planktonic foraminifera and paleotemperature reconstruction for the Subantarctic Zone of the South Atlantic |
title_fullStr |
Distribution of planktonic foraminifera and paleotemperature reconstruction for the Subantarctic Zone of the South Atlantic |
title_full_unstemmed |
Distribution of planktonic foraminifera and paleotemperature reconstruction for the Subantarctic Zone of the South Atlantic |
title_sort |
distribution of planktonic foraminifera and paleotemperature reconstruction for the subantarctic zone of the south atlantic |
publisher |
PANGAEA |
publishDate |
2002 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.706226 https://doi.org/10.1594/PANGAEA.706226 |
op_coverage |
LATITUDE: -42.913617 * LONGITUDE: 8.899817 * DATE/TIME START: 1997-12-25T00:00:00 * DATE/TIME END: 1997-12-25T00:00:00 |
long_lat |
ENVELOPE(8.899817,8.899817,-42.913617,-42.913617) |
genre |
Planktonic foraminifera South Atlantic Ocean Southern Ocean |
genre_facet |
Planktonic foraminifera South Atlantic Ocean Southern Ocean |
op_source |
Supplement to: Becquey, Sabine; Gersonde, Rainer (2002): Past hydrographic and climatic changes in the Subantarctic Zone of the South Atlantic - The Pleistocene record from ODP Site 1090. Palaeogeography, Palaeoclimatology, Palaeoecology, 182(3-4), 221-239, https://doi.org/10.1016/S0031-0182(01)00497-7 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.706226 https://doi.org/10.1594/PANGAEA.706226 |
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.70622610.1016/S0031-0182(01)00497-7 |
_version_ |
1810472722459787264 |