(Table S3) Benthic foraminiferal Mg/Ca, Li/Ca and stable isotope ratios of ODP Site 122-761
The sensitivities of benthic foraminiferal Mg/Ca and Li/Ca to bottom water temperature and carbonate saturation state have recently been assessed. Here we present a new approach that uses paired Mg/Ca and Li/Ca records to calculate simultaneous changes in temperature and saturation state. Using prev...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.831022 2023-05-15T13:49:51+02:00 (Table S3) Benthic foraminiferal Mg/Ca, Li/Ca and stable isotope ratios of ODP Site 122-761 Lear, Caroline H Mawbey, Elaine M Rosenthal, Yair LATITUDE: -16.737333 * LONGITUDE: 115.535000 * DATE/TIME START: 1988-07-19T00:00:00 * DATE/TIME END: 1988-07-25T00:00:00 * MINIMUM ELEVATION: -2179.0 m * MAXIMUM ELEVATION: -2179.0 m 2010-03-25 text/tab-separated-values, 2998 data points https://doi.pangaea.de/10.1594/PANGAEA.831022 https://doi.org/10.1594/PANGAEA.831022 en eng PANGAEA Bryan, Sean P; Marchitto, Thomas M (2010): Mg/Ca-temperature proxy in benthic foraminifera from the Florida Strait. PANGAEA, https://doi.org/10.1594/PANGAEA.831060 Lear, Caroline H; Rosenthal, Yair; Slowey, Niall C (2002): Benthic foraminiferal Mg/Ca ratios. PANGAEA, https://doi.org/10.1594/PANGAEA.831131 https://doi.pangaea.de/10.1594/PANGAEA.831022 https://doi.org/10.1594/PANGAEA.831022 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Lear, Caroline H; Mawbey, Elaine M; Rosenthal, Yair (2010): Cenozoic benthic foraminiferal Mg/Ca and Li/Ca records: Toward unlocking temperatures and saturation states. Paleoceanography, 25(4), PA4215, https://doi.org/10.1029/2009PA001880 122-761 AGE Bottom water temperature Calculated Calculated moving averages Cibicidoides mundulus δ13C δ18O COMPCORE Composite Core Grain size sieving Inductively coupled plasma - mass spectrometry (ICP-MS) Joides Resolution Leg122 Mass spectrometer Finnigan MAT 252 Ocean Drilling Program ODP Oridorsalis umbonatus Lithium/Calcium ratio Magnesium/Calcium ratio Size fraction > 0.063 mm sand South Indian Ridge South Indian Ocean Δ carbonate ion content Dataset 2010 ftpangaea https://doi.org/10.1594/PANGAEA.831022 https://doi.org/10.1029/2009PA001880 https://doi.org/10.1594/PANGAEA.831060 https://doi.org/10.1594/PANGAEA.831131 2023-01-20T09:03:10Z The sensitivities of benthic foraminiferal Mg/Ca and Li/Ca to bottom water temperature and carbonate saturation state have recently been assessed. Here we present a new approach that uses paired Mg/Ca and Li/Ca records to calculate simultaneous changes in temperature and saturation state. Using previously published records, we first use this approach to document a cooling of deep ocean waters associated with the establishment of the Antarctic ice sheet at the Eocene-Oligocene climate transition. We then apply this approach to new records of the Middle Miocene Climate Transition from ODP Site 761 to estimate variations in bottom water temperature and the oxygen isotopic composition of seawater. We estimate that the oxygen isotopic composition of seawater varied by ~1 per mil between the deglacial extreme of the Miocene Climatic Optimum and the glacial maximum following the Middle Miocene Climate Transition, indicating large amplitude variations in ice volume. However, the longer-term change between 15.3 and 12.5 Ma is marked by a ~1°C cooling of deep waters, and an increase in the oxygen isotopic composition of seawater of ~0.6 per mil. We find that bottom water saturation state increased in the lead up to the Middle Miocene Climate Transition and decreased shortly after. This supports decreasing pCO2 as a driver for global cooling and ice sheet expansion, in agreement with existing boron isotope and leaf stomatal index CO2 records but in contrast to the published alkenone CO2 records. Dataset Antarc* Antarctic Ice Sheet PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Indian The Antarctic ENVELOPE(115.535000,115.535000,-16.737333,-16.737333) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
122-761 AGE Bottom water temperature Calculated Calculated moving averages Cibicidoides mundulus δ13C δ18O COMPCORE Composite Core Grain size sieving Inductively coupled plasma - mass spectrometry (ICP-MS) Joides Resolution Leg122 Mass spectrometer Finnigan MAT 252 Ocean Drilling Program ODP Oridorsalis umbonatus Lithium/Calcium ratio Magnesium/Calcium ratio Size fraction > 0.063 mm sand South Indian Ridge South Indian Ocean Δ carbonate ion content |
spellingShingle |
122-761 AGE Bottom water temperature Calculated Calculated moving averages Cibicidoides mundulus δ13C δ18O COMPCORE Composite Core Grain size sieving Inductively coupled plasma - mass spectrometry (ICP-MS) Joides Resolution Leg122 Mass spectrometer Finnigan MAT 252 Ocean Drilling Program ODP Oridorsalis umbonatus Lithium/Calcium ratio Magnesium/Calcium ratio Size fraction > 0.063 mm sand South Indian Ridge South Indian Ocean Δ carbonate ion content Lear, Caroline H Mawbey, Elaine M Rosenthal, Yair (Table S3) Benthic foraminiferal Mg/Ca, Li/Ca and stable isotope ratios of ODP Site 122-761 |
topic_facet |
122-761 AGE Bottom water temperature Calculated Calculated moving averages Cibicidoides mundulus δ13C δ18O COMPCORE Composite Core Grain size sieving Inductively coupled plasma - mass spectrometry (ICP-MS) Joides Resolution Leg122 Mass spectrometer Finnigan MAT 252 Ocean Drilling Program ODP Oridorsalis umbonatus Lithium/Calcium ratio Magnesium/Calcium ratio Size fraction > 0.063 mm sand South Indian Ridge South Indian Ocean Δ carbonate ion content |
description |
The sensitivities of benthic foraminiferal Mg/Ca and Li/Ca to bottom water temperature and carbonate saturation state have recently been assessed. Here we present a new approach that uses paired Mg/Ca and Li/Ca records to calculate simultaneous changes in temperature and saturation state. Using previously published records, we first use this approach to document a cooling of deep ocean waters associated with the establishment of the Antarctic ice sheet at the Eocene-Oligocene climate transition. We then apply this approach to new records of the Middle Miocene Climate Transition from ODP Site 761 to estimate variations in bottom water temperature and the oxygen isotopic composition of seawater. We estimate that the oxygen isotopic composition of seawater varied by ~1 per mil between the deglacial extreme of the Miocene Climatic Optimum and the glacial maximum following the Middle Miocene Climate Transition, indicating large amplitude variations in ice volume. However, the longer-term change between 15.3 and 12.5 Ma is marked by a ~1°C cooling of deep waters, and an increase in the oxygen isotopic composition of seawater of ~0.6 per mil. We find that bottom water saturation state increased in the lead up to the Middle Miocene Climate Transition and decreased shortly after. This supports decreasing pCO2 as a driver for global cooling and ice sheet expansion, in agreement with existing boron isotope and leaf stomatal index CO2 records but in contrast to the published alkenone CO2 records. |
format |
Dataset |
author |
Lear, Caroline H Mawbey, Elaine M Rosenthal, Yair |
author_facet |
Lear, Caroline H Mawbey, Elaine M Rosenthal, Yair |
author_sort |
Lear, Caroline H |
title |
(Table S3) Benthic foraminiferal Mg/Ca, Li/Ca and stable isotope ratios of ODP Site 122-761 |
title_short |
(Table S3) Benthic foraminiferal Mg/Ca, Li/Ca and stable isotope ratios of ODP Site 122-761 |
title_full |
(Table S3) Benthic foraminiferal Mg/Ca, Li/Ca and stable isotope ratios of ODP Site 122-761 |
title_fullStr |
(Table S3) Benthic foraminiferal Mg/Ca, Li/Ca and stable isotope ratios of ODP Site 122-761 |
title_full_unstemmed |
(Table S3) Benthic foraminiferal Mg/Ca, Li/Ca and stable isotope ratios of ODP Site 122-761 |
title_sort |
(table s3) benthic foraminiferal mg/ca, li/ca and stable isotope ratios of odp site 122-761 |
publisher |
PANGAEA |
publishDate |
2010 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.831022 https://doi.org/10.1594/PANGAEA.831022 |
op_coverage |
LATITUDE: -16.737333 * LONGITUDE: 115.535000 * DATE/TIME START: 1988-07-19T00:00:00 * DATE/TIME END: 1988-07-25T00:00:00 * MINIMUM ELEVATION: -2179.0 m * MAXIMUM ELEVATION: -2179.0 m |
long_lat |
ENVELOPE(115.535000,115.535000,-16.737333,-16.737333) |
geographic |
Antarctic Indian The Antarctic |
geographic_facet |
Antarctic Indian The Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Supplement to: Lear, Caroline H; Mawbey, Elaine M; Rosenthal, Yair (2010): Cenozoic benthic foraminiferal Mg/Ca and Li/Ca records: Toward unlocking temperatures and saturation states. Paleoceanography, 25(4), PA4215, https://doi.org/10.1029/2009PA001880 |
op_relation |
Bryan, Sean P; Marchitto, Thomas M (2010): Mg/Ca-temperature proxy in benthic foraminifera from the Florida Strait. PANGAEA, https://doi.org/10.1594/PANGAEA.831060 Lear, Caroline H; Rosenthal, Yair; Slowey, Niall C (2002): Benthic foraminiferal Mg/Ca ratios. PANGAEA, https://doi.org/10.1594/PANGAEA.831131 https://doi.pangaea.de/10.1594/PANGAEA.831022 https://doi.org/10.1594/PANGAEA.831022 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.831022 https://doi.org/10.1029/2009PA001880 https://doi.org/10.1594/PANGAEA.831060 https://doi.org/10.1594/PANGAEA.831131 |
_version_ |
1766252425778298880 |