Mg/Ca ratios of Globigerina bulloides and stable isotope data of ODP Hole 177-1092B in the Southern Ocean, supplement to: Kuhnert, Henning; Bickert, Torsten; Paulsen, Harald (2009): Southern Ocean frontal system changes precede Antarctic ice sheet growth during the middle Miocene. Earth and Planetary Science Letters, 284(3-4), 630-638

The middle Miocene climate approximately 14 Ma ago was characterized by the glaciation of Antarctica, deep-ocean cooling and variations in the global carbon cycle. Although the Southern Ocean underwent significant oceanographic changes, there is limited information on their spatial extent and timing...

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Bibliographic Details
Main Authors: Kuhnert, Henning, Bickert, Torsten, Paulsen, Harald
Format: Dataset
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 2009
Subjects:
AGE
Online Access:https://dx.doi.org/10.1594/pangaea.727745
https://doi.pangaea.de/10.1594/PANGAEA.727745
id ftdatacite:10.1594/pangaea.727745
record_format openpolar
spelling ftdatacite:10.1594/pangaea.727745 2023-05-15T13:40:55+02:00 Mg/Ca ratios of Globigerina bulloides and stable isotope data of ODP Hole 177-1092B in the Southern Ocean, supplement to: Kuhnert, Henning; Bickert, Torsten; Paulsen, Harald (2009): Southern Ocean frontal system changes precede Antarctic ice sheet growth during the middle Miocene. Earth and Planetary Science Letters, 284(3-4), 630-638 Kuhnert, Henning Bickert, Torsten Paulsen, Harald 2009 text/tab-separated-values https://dx.doi.org/10.1594/pangaea.727745 https://doi.pangaea.de/10.1594/PANGAEA.727745 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/j.epsl.2009.05.030 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Sample code/label DEPTH, sediment/rock Depth, composite Depth, composite revised AGE Cibicidoides kullenbergi, δ13C Cibicidoides kullenbergi, δ18O Globigerina bulloides, δ13C Globigerina bulloides, δ18O Globigerina bulloides, Magnesium/Calcium ratio Drilling/drill rig DSDP/ODP/IODP sample designation Intercore correlation Mass spectrometer Finnigan MAT 252 ICP-MS, Thermo Finnigan, Element 2 Leg177 Joides Resolution Ocean Drilling Program ODP Supplementary Dataset dataset Dataset 2009 ftdatacite https://doi.org/10.1594/pangaea.727745 https://doi.org/10.1016/j.epsl.2009.05.030 2022-02-08T16:24:46Z The middle Miocene climate approximately 14 Ma ago was characterized by the glaciation of Antarctica, deep-ocean cooling and variations in the global carbon cycle. Although the Southern Ocean underwent significant oceanographic changes, there is limited information on their spatial extent and timing. However, such knowledge is crucial for understanding the role of the Southern Ocean and the Antarctic Circumpolar Current (ACC) for Antarctic glaciation and the coupling between the ocean and continental climate. We have reconstructed surface temperatures and seawater oxygen isotopes at Ocean Drilling Program (ODP) Site 1092 in the Polar Frontal Zone of the Atlantic sector of the Southern Ocean from foraminiferal oxygen isotopes (d18O) and magnesium to calcium ratios (Mg/Ca). Sea surface cooling by ~ 4 °C and freshening indicated by the ~ 1per mill reduction of seawater d18O (d18Osw) at 14.2 Ma precede the major step in Antarctic ice sheet growth at 13.8–13.9 Ma. This pattern qualitatively mirrors previous findings from the Pacific sector, and we interpret the surface hydrographic changes to reflect the circum-Antarctic northward shift of the Southern Ocean fronts and specifically at Site 1092 the passage of the Subantarctic Front. The magnitude of change in reconstructed d18Osw requires a d18Osw: salinity gradient significantly higher than the modern value (~ 0.52 per mill) and it possibly exceeded 1.1 per mill. This implies the Polar Frontal Zone was influenced by freshwater derived from Antarctica, which in turn confirms higher than modern continental precipitation. The latter has previously been suggested to have contributed to Antarctic glaciation. : DEPTH, sediment = mbsf, stable isotope data were originally generated by Paulsen (2005). AGE = tuned to Sites 1085 and 1146, modified by Kuhnert, Henning Dataset Antarc* Antarctic Antarctica Ice Sheet Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Pacific Southern Ocean The Antarctic
institution Open Polar
collection DataCite Metadata Store (German National Library of Science and Technology)
op_collection_id ftdatacite
language English
topic Sample code/label
DEPTH, sediment/rock
Depth, composite
Depth, composite revised
AGE
Cibicidoides kullenbergi, δ13C
Cibicidoides kullenbergi, δ18O
Globigerina bulloides, δ13C
Globigerina bulloides, δ18O
Globigerina bulloides, Magnesium/Calcium ratio
Drilling/drill rig
DSDP/ODP/IODP sample designation
Intercore correlation
Mass spectrometer Finnigan MAT 252
ICP-MS, Thermo Finnigan, Element 2
Leg177
Joides Resolution
Ocean Drilling Program ODP
spellingShingle Sample code/label
DEPTH, sediment/rock
Depth, composite
Depth, composite revised
AGE
Cibicidoides kullenbergi, δ13C
Cibicidoides kullenbergi, δ18O
Globigerina bulloides, δ13C
Globigerina bulloides, δ18O
Globigerina bulloides, Magnesium/Calcium ratio
Drilling/drill rig
DSDP/ODP/IODP sample designation
Intercore correlation
Mass spectrometer Finnigan MAT 252
ICP-MS, Thermo Finnigan, Element 2
Leg177
Joides Resolution
Ocean Drilling Program ODP
Kuhnert, Henning
Bickert, Torsten
Paulsen, Harald
Mg/Ca ratios of Globigerina bulloides and stable isotope data of ODP Hole 177-1092B in the Southern Ocean, supplement to: Kuhnert, Henning; Bickert, Torsten; Paulsen, Harald (2009): Southern Ocean frontal system changes precede Antarctic ice sheet growth during the middle Miocene. Earth and Planetary Science Letters, 284(3-4), 630-638
topic_facet Sample code/label
DEPTH, sediment/rock
Depth, composite
Depth, composite revised
AGE
Cibicidoides kullenbergi, δ13C
Cibicidoides kullenbergi, δ18O
Globigerina bulloides, δ13C
Globigerina bulloides, δ18O
Globigerina bulloides, Magnesium/Calcium ratio
Drilling/drill rig
DSDP/ODP/IODP sample designation
Intercore correlation
Mass spectrometer Finnigan MAT 252
ICP-MS, Thermo Finnigan, Element 2
Leg177
Joides Resolution
Ocean Drilling Program ODP
description The middle Miocene climate approximately 14 Ma ago was characterized by the glaciation of Antarctica, deep-ocean cooling and variations in the global carbon cycle. Although the Southern Ocean underwent significant oceanographic changes, there is limited information on their spatial extent and timing. However, such knowledge is crucial for understanding the role of the Southern Ocean and the Antarctic Circumpolar Current (ACC) for Antarctic glaciation and the coupling between the ocean and continental climate. We have reconstructed surface temperatures and seawater oxygen isotopes at Ocean Drilling Program (ODP) Site 1092 in the Polar Frontal Zone of the Atlantic sector of the Southern Ocean from foraminiferal oxygen isotopes (d18O) and magnesium to calcium ratios (Mg/Ca). Sea surface cooling by ~ 4 °C and freshening indicated by the ~ 1per mill reduction of seawater d18O (d18Osw) at 14.2 Ma precede the major step in Antarctic ice sheet growth at 13.8–13.9 Ma. This pattern qualitatively mirrors previous findings from the Pacific sector, and we interpret the surface hydrographic changes to reflect the circum-Antarctic northward shift of the Southern Ocean fronts and specifically at Site 1092 the passage of the Subantarctic Front. The magnitude of change in reconstructed d18Osw requires a d18Osw: salinity gradient significantly higher than the modern value (~ 0.52 per mill) and it possibly exceeded 1.1 per mill. This implies the Polar Frontal Zone was influenced by freshwater derived from Antarctica, which in turn confirms higher than modern continental precipitation. The latter has previously been suggested to have contributed to Antarctic glaciation. : DEPTH, sediment = mbsf, stable isotope data were originally generated by Paulsen (2005). AGE = tuned to Sites 1085 and 1146, modified by Kuhnert, Henning
format Dataset
author Kuhnert, Henning
Bickert, Torsten
Paulsen, Harald
author_facet Kuhnert, Henning
Bickert, Torsten
Paulsen, Harald
author_sort Kuhnert, Henning
title Mg/Ca ratios of Globigerina bulloides and stable isotope data of ODP Hole 177-1092B in the Southern Ocean, supplement to: Kuhnert, Henning; Bickert, Torsten; Paulsen, Harald (2009): Southern Ocean frontal system changes precede Antarctic ice sheet growth during the middle Miocene. Earth and Planetary Science Letters, 284(3-4), 630-638
title_short Mg/Ca ratios of Globigerina bulloides and stable isotope data of ODP Hole 177-1092B in the Southern Ocean, supplement to: Kuhnert, Henning; Bickert, Torsten; Paulsen, Harald (2009): Southern Ocean frontal system changes precede Antarctic ice sheet growth during the middle Miocene. Earth and Planetary Science Letters, 284(3-4), 630-638
title_full Mg/Ca ratios of Globigerina bulloides and stable isotope data of ODP Hole 177-1092B in the Southern Ocean, supplement to: Kuhnert, Henning; Bickert, Torsten; Paulsen, Harald (2009): Southern Ocean frontal system changes precede Antarctic ice sheet growth during the middle Miocene. Earth and Planetary Science Letters, 284(3-4), 630-638
title_fullStr Mg/Ca ratios of Globigerina bulloides and stable isotope data of ODP Hole 177-1092B in the Southern Ocean, supplement to: Kuhnert, Henning; Bickert, Torsten; Paulsen, Harald (2009): Southern Ocean frontal system changes precede Antarctic ice sheet growth during the middle Miocene. Earth and Planetary Science Letters, 284(3-4), 630-638
title_full_unstemmed Mg/Ca ratios of Globigerina bulloides and stable isotope data of ODP Hole 177-1092B in the Southern Ocean, supplement to: Kuhnert, Henning; Bickert, Torsten; Paulsen, Harald (2009): Southern Ocean frontal system changes precede Antarctic ice sheet growth during the middle Miocene. Earth and Planetary Science Letters, 284(3-4), 630-638
title_sort mg/ca ratios of globigerina bulloides and stable isotope data of odp hole 177-1092b in the southern ocean, supplement to: kuhnert, henning; bickert, torsten; paulsen, harald (2009): southern ocean frontal system changes precede antarctic ice sheet growth during the middle miocene. earth and planetary science letters, 284(3-4), 630-638
publisher PANGAEA - Data Publisher for Earth & Environmental Science
publishDate 2009
url https://dx.doi.org/10.1594/pangaea.727745
https://doi.pangaea.de/10.1594/PANGAEA.727745
geographic Antarctic
Pacific
Southern Ocean
The Antarctic
geographic_facet Antarctic
Pacific
Southern Ocean
The Antarctic
genre Antarc*
Antarctic
Antarctica
Ice Sheet
Southern Ocean
genre_facet Antarc*
Antarctic
Antarctica
Ice Sheet
Southern Ocean
op_relation https://dx.doi.org/10.1016/j.epsl.2009.05.030
op_rights Creative Commons Attribution 3.0 Unported
https://creativecommons.org/licenses/by/3.0/legalcode
cc-by-3.0
op_rightsnorm CC-BY
op_doi https://doi.org/10.1594/pangaea.727745
https://doi.org/10.1016/j.epsl.2009.05.030
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