Neodymium isotopic record of planktonic foraminifera in sediment core MD81-LC21
A well developed sapropel (S5) was deposited in the eastern Mediterranean during the Last Interglacial (Eemian), 124-119 ka. Freshwater contributions to the basin at this time can be traced using the isotopic composition of Nd in planktonic foraminifera. This enables differentiation between radiogen...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.817550 2023-05-15T18:00:40+02:00 Neodymium isotopic record of planktonic foraminifera in sediment core MD81-LC21 Osborne, Anne H Marino, Gianluca Vance, Derek Rohling, Eelco J LATITUDE: 35.660000 * LONGITUDE: 26.580000 * DATE/TIME START: 1995-01-17T00:00:00 * DATE/TIME END: 1995-01-17T00:00:00 2010-08-02 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.817550 https://doi.org/10.1594/PANGAEA.817550 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.817550 https://doi.org/10.1594/PANGAEA.817550 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Osborne, Anne H; Marino, Gianluca; Vance, Derek; Rohling, Eelco J (2010): Eastern Mediterranean surface water Nd during Eemian sapropel S5: monitoring northerly (mid-latitude) versus southerly (sub-tropical) freshwater contributions. Quaternary Science Reviews, 29(19-20), 2473-2483, https://doi.org/10.1016/j.quascirev.2010.05.015 CALYPSO Calypso Corer LC21 LC-21 Marion Dufresne (1995) MD81 MD81-LC21 Mediterranean Sea PALAEOFLUX Dataset 2010 ftpangaea https://doi.org/10.1594/PANGAEA.817550 https://doi.org/10.1016/j.quascirev.2010.05.015 2023-01-20T07:33:05Z A well developed sapropel (S5) was deposited in the eastern Mediterranean during the Last Interglacial (Eemian), 124-119 ka. Freshwater contributions to the basin at this time can be traced using the isotopic composition of Nd in planktonic foraminifera. This enables differentiation between radiogenic sources to the south, under the influence of the African monsoon, and unradiogenic sources to the north, relating to the mid-latitude westerlies. Here we compare new Nd data, from a core in the southeast Aegean Sea, with published data from the Ionian and Levantine Seas. Shifts towards more radiogenic Nd in the lower and middle parts of sapropel S5 are most pronounced in the Ionian Sea record, with epsioln-Nd and d18O G. ruber co-varying more closely here than in the Levantine and Aegean Seas. This is consistent with a freshwater source proximal to the Ionian Sea site, likely indicating a substantial reactivation of rivers flowing northward from the central Saharan watershed. The lack, during S5 deposition, of a noticeable shift towards more unradiogenic Nd in the Aegean record would exclude a large influx of water from the northern borders of the eastern Mediterranean during sapropel deposition. These findings support a scenario whereby the Last Interglacial eastern Mediterranean was influenced strongly by the remote effects of an intensified African monsoon, with more local precipitation in the northern borders contributing relatively little to the sea surface composition. Dataset Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(26.580000,26.580000,35.660000,35.660000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
CALYPSO Calypso Corer LC21 LC-21 Marion Dufresne (1995) MD81 MD81-LC21 Mediterranean Sea PALAEOFLUX |
spellingShingle |
CALYPSO Calypso Corer LC21 LC-21 Marion Dufresne (1995) MD81 MD81-LC21 Mediterranean Sea PALAEOFLUX Osborne, Anne H Marino, Gianluca Vance, Derek Rohling, Eelco J Neodymium isotopic record of planktonic foraminifera in sediment core MD81-LC21 |
topic_facet |
CALYPSO Calypso Corer LC21 LC-21 Marion Dufresne (1995) MD81 MD81-LC21 Mediterranean Sea PALAEOFLUX |
description |
A well developed sapropel (S5) was deposited in the eastern Mediterranean during the Last Interglacial (Eemian), 124-119 ka. Freshwater contributions to the basin at this time can be traced using the isotopic composition of Nd in planktonic foraminifera. This enables differentiation between radiogenic sources to the south, under the influence of the African monsoon, and unradiogenic sources to the north, relating to the mid-latitude westerlies. Here we compare new Nd data, from a core in the southeast Aegean Sea, with published data from the Ionian and Levantine Seas. Shifts towards more radiogenic Nd in the lower and middle parts of sapropel S5 are most pronounced in the Ionian Sea record, with epsioln-Nd and d18O G. ruber co-varying more closely here than in the Levantine and Aegean Seas. This is consistent with a freshwater source proximal to the Ionian Sea site, likely indicating a substantial reactivation of rivers flowing northward from the central Saharan watershed. The lack, during S5 deposition, of a noticeable shift towards more unradiogenic Nd in the Aegean record would exclude a large influx of water from the northern borders of the eastern Mediterranean during sapropel deposition. These findings support a scenario whereby the Last Interglacial eastern Mediterranean was influenced strongly by the remote effects of an intensified African monsoon, with more local precipitation in the northern borders contributing relatively little to the sea surface composition. |
format |
Dataset |
author |
Osborne, Anne H Marino, Gianluca Vance, Derek Rohling, Eelco J |
author_facet |
Osborne, Anne H Marino, Gianluca Vance, Derek Rohling, Eelco J |
author_sort |
Osborne, Anne H |
title |
Neodymium isotopic record of planktonic foraminifera in sediment core MD81-LC21 |
title_short |
Neodymium isotopic record of planktonic foraminifera in sediment core MD81-LC21 |
title_full |
Neodymium isotopic record of planktonic foraminifera in sediment core MD81-LC21 |
title_fullStr |
Neodymium isotopic record of planktonic foraminifera in sediment core MD81-LC21 |
title_full_unstemmed |
Neodymium isotopic record of planktonic foraminifera in sediment core MD81-LC21 |
title_sort |
neodymium isotopic record of planktonic foraminifera in sediment core md81-lc21 |
publisher |
PANGAEA |
publishDate |
2010 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.817550 https://doi.org/10.1594/PANGAEA.817550 |
op_coverage |
LATITUDE: 35.660000 * LONGITUDE: 26.580000 * DATE/TIME START: 1995-01-17T00:00:00 * DATE/TIME END: 1995-01-17T00:00:00 |
long_lat |
ENVELOPE(26.580000,26.580000,35.660000,35.660000) |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Supplement to: Osborne, Anne H; Marino, Gianluca; Vance, Derek; Rohling, Eelco J (2010): Eastern Mediterranean surface water Nd during Eemian sapropel S5: monitoring northerly (mid-latitude) versus southerly (sub-tropical) freshwater contributions. Quaternary Science Reviews, 29(19-20), 2473-2483, https://doi.org/10.1016/j.quascirev.2010.05.015 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.817550 https://doi.org/10.1594/PANGAEA.817550 |
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.817550 https://doi.org/10.1016/j.quascirev.2010.05.015 |
_version_ |
1766169868977045504 |