(Table 1) Age model of DSDP Site 72-516, supplement to: Pagani, Mark; Arthur, Michael A; Freeman, Katherine H (2000): Variations in Miocene phytoplankton growth rates in the southwest Atlantic: Evidence for changes in ocean circulation. Paleoceanography, 15(5), 486-496
Changes in ocean circulation are often credited as the primary control on large-scale climate change during the Miocene. This study investigates the latest Oligocene to middle Miocene evolution of Southern Ocean circulation by evaluating stable isotopic trends of shallow- and deep-dwelling planktoni...
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ftdatacite:10.1594/pangaea.848096 2023-05-15T13:35:31+02:00 (Table 1) Age model of DSDP Site 72-516, supplement to: Pagani, Mark; Arthur, Michael A; Freeman, Katherine H (2000): Variations in Miocene phytoplankton growth rates in the southwest Atlantic: Evidence for changes in ocean circulation. Paleoceanography, 15(5), 486-496 Pagani, Mark Arthur, Michael A Freeman, Katherine H 2000 text/tab-separated-values https://dx.doi.org/10.1594/pangaea.848096 https://doi.pangaea.de/10.1594/PANGAEA.848096 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1029/1999pa000484 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Event label Ageprofile Datum Description DEPTH, sediment/rock Age model Drilling/drill rig Age model, paleomag, Berggren et al 1985 Leg72 Glomar Challenger Deep Sea Drilling Project DSDP Supplementary Dataset dataset Dataset 2000 ftdatacite https://doi.org/10.1594/pangaea.848096 https://doi.org/10.1029/1999pa000484 2021-11-05T12:55:41Z Changes in ocean circulation are often credited as the primary control on large-scale climate change during the Miocene. This study investigates the latest Oligocene to middle Miocene evolution of Southern Ocean circulation by evaluating stable isotopic trends of shallow- and deep-dwelling planktonic foraminifera, as well as epsilon-p records reconstructed from the carbon isotopic composition of diunsaturated alkenones in the southwestern Altantic Ocean (Deep Sea Drilling Project site 516). Changes in epsilon-p at site 516 closely paralleled the opening and deepening of the Drake Passage as inferred from seafloor magnetic anomalies. A large negative shift in epsilon-p at ~20.3 Ma is interpreted to reflect an increase in upper water column nutrient concentrations, caused by the onset or strengthening of the Antarctic Circumpolar Current (ACC). Measurable alkenone concentrations disappear by ~17 Ma, prior to a collapse in surface-to-thermocline d18O and d13C gradients. This is interpreted as reflecting a severe decrease in mixed layer nutrient concentrations and reduced proto-Antarctic Intermediate Water influence. The d18O gradient was reestablished by 14.5 Ma, coincident with the hypothesized East Antarctic ice sheet expansion, suggesting a direct relationship between increased strength of the ACC and the largest climate shift of the middle Miocene. Dataset Antarc* Antarctic Drake Passage Ice Sheet Planktonic foraminifera Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean The Antarctic Drake Passage East Antarctic Ice Sheet |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Event label Ageprofile Datum Description DEPTH, sediment/rock Age model Drilling/drill rig Age model, paleomag, Berggren et al 1985 Leg72 Glomar Challenger Deep Sea Drilling Project DSDP |
spellingShingle |
Event label Ageprofile Datum Description DEPTH, sediment/rock Age model Drilling/drill rig Age model, paleomag, Berggren et al 1985 Leg72 Glomar Challenger Deep Sea Drilling Project DSDP Pagani, Mark Arthur, Michael A Freeman, Katherine H (Table 1) Age model of DSDP Site 72-516, supplement to: Pagani, Mark; Arthur, Michael A; Freeman, Katherine H (2000): Variations in Miocene phytoplankton growth rates in the southwest Atlantic: Evidence for changes in ocean circulation. Paleoceanography, 15(5), 486-496 |
topic_facet |
Event label Ageprofile Datum Description DEPTH, sediment/rock Age model Drilling/drill rig Age model, paleomag, Berggren et al 1985 Leg72 Glomar Challenger Deep Sea Drilling Project DSDP |
description |
Changes in ocean circulation are often credited as the primary control on large-scale climate change during the Miocene. This study investigates the latest Oligocene to middle Miocene evolution of Southern Ocean circulation by evaluating stable isotopic trends of shallow- and deep-dwelling planktonic foraminifera, as well as epsilon-p records reconstructed from the carbon isotopic composition of diunsaturated alkenones in the southwestern Altantic Ocean (Deep Sea Drilling Project site 516). Changes in epsilon-p at site 516 closely paralleled the opening and deepening of the Drake Passage as inferred from seafloor magnetic anomalies. A large negative shift in epsilon-p at ~20.3 Ma is interpreted to reflect an increase in upper water column nutrient concentrations, caused by the onset or strengthening of the Antarctic Circumpolar Current (ACC). Measurable alkenone concentrations disappear by ~17 Ma, prior to a collapse in surface-to-thermocline d18O and d13C gradients. This is interpreted as reflecting a severe decrease in mixed layer nutrient concentrations and reduced proto-Antarctic Intermediate Water influence. The d18O gradient was reestablished by 14.5 Ma, coincident with the hypothesized East Antarctic ice sheet expansion, suggesting a direct relationship between increased strength of the ACC and the largest climate shift of the middle Miocene. |
format |
Dataset |
author |
Pagani, Mark Arthur, Michael A Freeman, Katherine H |
author_facet |
Pagani, Mark Arthur, Michael A Freeman, Katherine H |
author_sort |
Pagani, Mark |
title |
(Table 1) Age model of DSDP Site 72-516, supplement to: Pagani, Mark; Arthur, Michael A; Freeman, Katherine H (2000): Variations in Miocene phytoplankton growth rates in the southwest Atlantic: Evidence for changes in ocean circulation. Paleoceanography, 15(5), 486-496 |
title_short |
(Table 1) Age model of DSDP Site 72-516, supplement to: Pagani, Mark; Arthur, Michael A; Freeman, Katherine H (2000): Variations in Miocene phytoplankton growth rates in the southwest Atlantic: Evidence for changes in ocean circulation. Paleoceanography, 15(5), 486-496 |
title_full |
(Table 1) Age model of DSDP Site 72-516, supplement to: Pagani, Mark; Arthur, Michael A; Freeman, Katherine H (2000): Variations in Miocene phytoplankton growth rates in the southwest Atlantic: Evidence for changes in ocean circulation. Paleoceanography, 15(5), 486-496 |
title_fullStr |
(Table 1) Age model of DSDP Site 72-516, supplement to: Pagani, Mark; Arthur, Michael A; Freeman, Katherine H (2000): Variations in Miocene phytoplankton growth rates in the southwest Atlantic: Evidence for changes in ocean circulation. Paleoceanography, 15(5), 486-496 |
title_full_unstemmed |
(Table 1) Age model of DSDP Site 72-516, supplement to: Pagani, Mark; Arthur, Michael A; Freeman, Katherine H (2000): Variations in Miocene phytoplankton growth rates in the southwest Atlantic: Evidence for changes in ocean circulation. Paleoceanography, 15(5), 486-496 |
title_sort |
(table 1) age model of dsdp site 72-516, supplement to: pagani, mark; arthur, michael a; freeman, katherine h (2000): variations in miocene phytoplankton growth rates in the southwest atlantic: evidence for changes in ocean circulation. paleoceanography, 15(5), 486-496 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2000 |
url |
https://dx.doi.org/10.1594/pangaea.848096 https://doi.pangaea.de/10.1594/PANGAEA.848096 |
geographic |
Antarctic Southern Ocean The Antarctic Drake Passage East Antarctic Ice Sheet |
geographic_facet |
Antarctic Southern Ocean The Antarctic Drake Passage East Antarctic Ice Sheet |
genre |
Antarc* Antarctic Drake Passage Ice Sheet Planktonic foraminifera Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Ice Sheet Planktonic foraminifera Southern Ocean |
op_relation |
https://dx.doi.org/10.1029/1999pa000484 |
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.848096 https://doi.org/10.1029/1999pa000484 |
_version_ |
1766066727645347840 |