Late Pliocene variations of the Mediterranean outflow
Late Pliocene changes in the advection of Mediterranean Outflow Water (MOW) derivates were reconstructed at northeast Atlantic DSDP/ODP sites 548 and 982 and compared to records of WMDW at West Mediterranean Site 978. Neodymium isotope (epsilon-Nd) values more positive than ~10.5/~ 11 reflect dilute...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.863957 2024-09-15T18:20:41+00:00 Late Pliocene variations of the Mediterranean outflow Khélifi, Nabil Sarnthein, Michael Frank, Martin Andersen, Nils Garbe-Schönberg, Dieter MEDIAN LATITUDE: 46.128040 * MEDIAN LONGITUDE: -9.101561 * SOUTH-BOUND LATITUDE: 36.031700 * WEST-BOUND LONGITUDE: -15.854183 * NORTH-BOUND LATITUDE: 57.516700 * EAST-BOUND LONGITUDE: -1.955280 * DATE/TIME START: 1981-06-10T00:00:00 * DATE/TIME END: 1995-07-19T02:25:00 2014 application/zip, 15 datasets https://doi.pangaea.de/10.1594/PANGAEA.863957 https://doi.org/10.1594/PANGAEA.863957 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.863957 https://doi.org/10.1594/PANGAEA.863957 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Khélifi, Nabil; Sarnthein, Michael; Frank, Martin; Andersen, Nils; Garbe-Schönberg, Dieter (2014): Late Pliocene variations of the Mediterranean outflow. Marine Geology, 357, 182-194, https://doi.org/10.1016/j.margeo.2014.07.006 Deep Sea Drilling Project DSDP Ocean Drilling Program ODP dataset publication series 2014 ftpangaea https://doi.org/10.1594/PANGAEA.86395710.1016/j.margeo.2014.07.006 2024-07-24T02:31:21Z Late Pliocene changes in the advection of Mediterranean Outflow Water (MOW) derivates were reconstructed at northeast Atlantic DSDP/ODP sites 548 and 982 and compared to records of WMDW at West Mediterranean Site 978. Neodymium isotope (epsilon-Nd) values more positive than ~10.5/~ 11 reflect diluted MOW derivates that spread almost continuously into the northeast Atlantic from 3.7 to 2.55 Ma, reaching Rockall Plateau Site 982 from 3.63 to 2.75 Ma. From 3.4 to 3.3 Ma average MOW temperature and salinity increased by 2°-4 °C and ~1 psu both at proximal Site 548 and distal Site 982. The rise implies a rise in flow strength, coeval with a long-term rise in both west Mediterranean Sea surface salinity by almost 2 psu and average bottom water salinity (BWS) by ~1 psu, despite inherent uncertainties in BWS estimates. The changes were linked with major Mediterranean aridification and a drop in African monsoon humidity. In contrast to model expectations, the rise in MOW salt discharge after 3.4 Ma did not translate into improved ventilation of North Atlantic Deep Water, since it possibly was too small to significantly influence Atlantic Meridional Overturning Circulation. Right after ~2.95 Ma, with the onset of major Northern Hemisphere Glaciation, long-term average bottom water temperature (BWT) and BWS at Site 548 dropped abruptly by ~5 °C and ~1-2 psu, in contrast to more distal Site 982, where BWT and BWS continued to oscillate at estimates of ~2 °C and 1.5-2.5 psu higher than today until ~2.6 Ma. We relate the small-scale changes both to a reduced MOW flow and to enhanced dilution by warm waters of a strengthened North Atlantic Current temporarily replacing MOW derivates at Rockall Plateau. Other/Unknown Material north atlantic current North Atlantic Deep Water North Atlantic Northeast Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-15.854183,-1.955280,57.516700,36.031700) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Deep Sea Drilling Project DSDP Ocean Drilling Program ODP |
spellingShingle |
Deep Sea Drilling Project DSDP Ocean Drilling Program ODP Khélifi, Nabil Sarnthein, Michael Frank, Martin Andersen, Nils Garbe-Schönberg, Dieter Late Pliocene variations of the Mediterranean outflow |
topic_facet |
Deep Sea Drilling Project DSDP Ocean Drilling Program ODP |
description |
Late Pliocene changes in the advection of Mediterranean Outflow Water (MOW) derivates were reconstructed at northeast Atlantic DSDP/ODP sites 548 and 982 and compared to records of WMDW at West Mediterranean Site 978. Neodymium isotope (epsilon-Nd) values more positive than ~10.5/~ 11 reflect diluted MOW derivates that spread almost continuously into the northeast Atlantic from 3.7 to 2.55 Ma, reaching Rockall Plateau Site 982 from 3.63 to 2.75 Ma. From 3.4 to 3.3 Ma average MOW temperature and salinity increased by 2°-4 °C and ~1 psu both at proximal Site 548 and distal Site 982. The rise implies a rise in flow strength, coeval with a long-term rise in both west Mediterranean Sea surface salinity by almost 2 psu and average bottom water salinity (BWS) by ~1 psu, despite inherent uncertainties in BWS estimates. The changes were linked with major Mediterranean aridification and a drop in African monsoon humidity. In contrast to model expectations, the rise in MOW salt discharge after 3.4 Ma did not translate into improved ventilation of North Atlantic Deep Water, since it possibly was too small to significantly influence Atlantic Meridional Overturning Circulation. Right after ~2.95 Ma, with the onset of major Northern Hemisphere Glaciation, long-term average bottom water temperature (BWT) and BWS at Site 548 dropped abruptly by ~5 °C and ~1-2 psu, in contrast to more distal Site 982, where BWT and BWS continued to oscillate at estimates of ~2 °C and 1.5-2.5 psu higher than today until ~2.6 Ma. We relate the small-scale changes both to a reduced MOW flow and to enhanced dilution by warm waters of a strengthened North Atlantic Current temporarily replacing MOW derivates at Rockall Plateau. |
format |
Other/Unknown Material |
author |
Khélifi, Nabil Sarnthein, Michael Frank, Martin Andersen, Nils Garbe-Schönberg, Dieter |
author_facet |
Khélifi, Nabil Sarnthein, Michael Frank, Martin Andersen, Nils Garbe-Schönberg, Dieter |
author_sort |
Khélifi, Nabil |
title |
Late Pliocene variations of the Mediterranean outflow |
title_short |
Late Pliocene variations of the Mediterranean outflow |
title_full |
Late Pliocene variations of the Mediterranean outflow |
title_fullStr |
Late Pliocene variations of the Mediterranean outflow |
title_full_unstemmed |
Late Pliocene variations of the Mediterranean outflow |
title_sort |
late pliocene variations of the mediterranean outflow |
publisher |
PANGAEA |
publishDate |
2014 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.863957 https://doi.org/10.1594/PANGAEA.863957 |
op_coverage |
MEDIAN LATITUDE: 46.128040 * MEDIAN LONGITUDE: -9.101561 * SOUTH-BOUND LATITUDE: 36.031700 * WEST-BOUND LONGITUDE: -15.854183 * NORTH-BOUND LATITUDE: 57.516700 * EAST-BOUND LONGITUDE: -1.955280 * DATE/TIME START: 1981-06-10T00:00:00 * DATE/TIME END: 1995-07-19T02:25:00 |
long_lat |
ENVELOPE(-15.854183,-1.955280,57.516700,36.031700) |
genre |
north atlantic current North Atlantic Deep Water North Atlantic Northeast Atlantic |
genre_facet |
north atlantic current North Atlantic Deep Water North Atlantic Northeast Atlantic |
op_source |
Supplement to: Khélifi, Nabil; Sarnthein, Michael; Frank, Martin; Andersen, Nils; Garbe-Schönberg, Dieter (2014): Late Pliocene variations of the Mediterranean outflow. Marine Geology, 357, 182-194, https://doi.org/10.1016/j.margeo.2014.07.006 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.863957 https://doi.org/10.1594/PANGAEA.863957 |
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.86395710.1016/j.margeo.2014.07.006 |
_version_ |
1810459067113537536 |