Interacting Loop Current variability and Mississippi River discharge over the past 400 kyr
The Loop Current mediating the oceanic heat and salt flux from the Caribbean Sea into the Atlantic Ocean and its interference with the Mississippi River discharge are critical for both the regional climate in the Gulf of Mexico area and the water vapor transport towards high northern latitudes. We p...
Published in: | Earth and Planetary Science Letters |
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/9666/ https://doi.org/10.1016/j.epsl.2008.04.051 |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:9666 2023-05-15T16:41:14+02:00 Interacting Loop Current variability and Mississippi River discharge over the past 400 kyr Nürnberg, Dirk Ziegler, Martin Karas, Cyrus Tiedemann, Ralf Schmidt, Matthew W. 2008-07 https://orca.cardiff.ac.uk/id/eprint/9666/ https://doi.org/10.1016/j.epsl.2008.04.051 unknown Elsevier Nürnberg, Dirk, Ziegler, Martin, Karas, Cyrus, Tiedemann, Ralf and Schmidt, Matthew W. 2008. Interacting Loop Current variability and Mississippi River discharge over the past 400 kyr. Earth and Planetary Science Letters 272 (1-2) , pp. 278-289. 10.1016/j.epsl.2008.04.051 https://doi.org/10.1016/j.epsl.2008.04.051 doi:10.1016/j.epsl.2008.04.051 QE Geology Article PeerReviewed 2008 ftunivcardiff https://doi.org/10.1016/j.epsl.2008.04.051 2022-09-25T20:17:14Z The Loop Current mediating the oceanic heat and salt flux from the Caribbean Sea into the Atlantic Ocean and its interference with the Mississippi River discharge are critical for both the regional climate in the Gulf of Mexico area and the water vapor transport towards high northern latitudes. We present a 400-kyr record of sea surface temperature and local surface salinity from the northeastern Gulf of Mexico (IMAGES core MD02-2575) approximated from combined planktonic foraminiferal δ18O and Mg/Ca, which reflects the temporal dynamics of the Loop Current and its relationship to both varying Mississippi discharge and evolution of the Western Hemisphere Warm pool. The reconstructed sea surface temperature and salinity reveal glacial/interglacial amplitudes that are significantly larger than in the Western Hemisphere Warm pool. Sea surface freshening is observed during the extreme cool periods of Marine Isotope Stages 2, 8, and 10, caused by the strengthened Mississippi discharge which spread widely across the Gulf favored by the less established Loop Current. Interglacial and interstadial sea-surface conditions, instead, point to a strengthened, northward flowing Loop Current in line with the northward position of the Intertropical Convergence Zone, allowing northeastern Gulf of Mexico surface hydrographic conditions to approach those of the Caribbean. At these times, the Mississippi discharge was low and deflected westward, promoted by the extended Loop Current. Previously described deglacial megadischarge events further to the west did not affect the northeastern Gulf of Mexico hydrography, implying that meltwater routing from the Laurentide Ice Sheet via the Mississippi River is unlikely to have affected Atlantic Meridional Overturning Circulation. Article in Journal/Newspaper Ice Sheet Cardiff University: ORCA (Online Research @ Cardiff) Earth and Planetary Science Letters 272 1-2 278 289 |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
unknown |
topic |
QE Geology |
spellingShingle |
QE Geology Nürnberg, Dirk Ziegler, Martin Karas, Cyrus Tiedemann, Ralf Schmidt, Matthew W. Interacting Loop Current variability and Mississippi River discharge over the past 400 kyr |
topic_facet |
QE Geology |
description |
The Loop Current mediating the oceanic heat and salt flux from the Caribbean Sea into the Atlantic Ocean and its interference with the Mississippi River discharge are critical for both the regional climate in the Gulf of Mexico area and the water vapor transport towards high northern latitudes. We present a 400-kyr record of sea surface temperature and local surface salinity from the northeastern Gulf of Mexico (IMAGES core MD02-2575) approximated from combined planktonic foraminiferal δ18O and Mg/Ca, which reflects the temporal dynamics of the Loop Current and its relationship to both varying Mississippi discharge and evolution of the Western Hemisphere Warm pool. The reconstructed sea surface temperature and salinity reveal glacial/interglacial amplitudes that are significantly larger than in the Western Hemisphere Warm pool. Sea surface freshening is observed during the extreme cool periods of Marine Isotope Stages 2, 8, and 10, caused by the strengthened Mississippi discharge which spread widely across the Gulf favored by the less established Loop Current. Interglacial and interstadial sea-surface conditions, instead, point to a strengthened, northward flowing Loop Current in line with the northward position of the Intertropical Convergence Zone, allowing northeastern Gulf of Mexico surface hydrographic conditions to approach those of the Caribbean. At these times, the Mississippi discharge was low and deflected westward, promoted by the extended Loop Current. Previously described deglacial megadischarge events further to the west did not affect the northeastern Gulf of Mexico hydrography, implying that meltwater routing from the Laurentide Ice Sheet via the Mississippi River is unlikely to have affected Atlantic Meridional Overturning Circulation. |
format |
Article in Journal/Newspaper |
author |
Nürnberg, Dirk Ziegler, Martin Karas, Cyrus Tiedemann, Ralf Schmidt, Matthew W. |
author_facet |
Nürnberg, Dirk Ziegler, Martin Karas, Cyrus Tiedemann, Ralf Schmidt, Matthew W. |
author_sort |
Nürnberg, Dirk |
title |
Interacting Loop Current variability and Mississippi River discharge over the past 400 kyr |
title_short |
Interacting Loop Current variability and Mississippi River discharge over the past 400 kyr |
title_full |
Interacting Loop Current variability and Mississippi River discharge over the past 400 kyr |
title_fullStr |
Interacting Loop Current variability and Mississippi River discharge over the past 400 kyr |
title_full_unstemmed |
Interacting Loop Current variability and Mississippi River discharge over the past 400 kyr |
title_sort |
interacting loop current variability and mississippi river discharge over the past 400 kyr |
publisher |
Elsevier |
publishDate |
2008 |
url |
https://orca.cardiff.ac.uk/id/eprint/9666/ https://doi.org/10.1016/j.epsl.2008.04.051 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Nürnberg, Dirk, Ziegler, Martin, Karas, Cyrus, Tiedemann, Ralf and Schmidt, Matthew W. 2008. Interacting Loop Current variability and Mississippi River discharge over the past 400 kyr. Earth and Planetary Science Letters 272 (1-2) , pp. 278-289. 10.1016/j.epsl.2008.04.051 https://doi.org/10.1016/j.epsl.2008.04.051 doi:10.1016/j.epsl.2008.04.051 |
op_doi |
https://doi.org/10.1016/j.epsl.2008.04.051 |
container_title |
Earth and Planetary Science Letters |
container_volume |
272 |
container_issue |
1-2 |
container_start_page |
278 |
op_container_end_page |
289 |
_version_ |
1766031665428168704 |