Geochemistry of tropical Atlantic sediments of Marine Isotope Stage 4
Antarctic Intermediate Water (AAIW) and Subantarctic Mode Water (SAMW) are the main conduits for the supply of dissolved silicon (silicic acid) from the deep Southern Ocean (SO) to the low-latitude surface ocean and therefore have an important control on low-latitude diatom productivity. Enhanced su...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.822026 2024-09-15T17:42:32+00:00 Geochemistry of tropical Atlantic sediments of Marine Isotope Stage 4 Griffiths, James D Barker, Stephen Hendry, Katharine R Thornalley, David J R van de Flierdt, Tina Hall, Ian R Anderson, Robert F MEDIAN LATITUDE: 8.248889 * MEDIAN LONGITUDE: -45.372333 * SOUTH-BOUND LATITUDE: 0.563000 * WEST-BOUND LONGITUDE: -61.233500 * NORTH-BOUND LATITUDE: 12.091833 * EAST-BOUND LONGITUDE: -13.650000 * DATE/TIME START: 1983-03-19T00:00:00 * DATE/TIME END: 1999-08-01T00:00:00 2013 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.822026 https://doi.org/10.1594/PANGAEA.822026 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.822026 https://doi.org/10.1594/PANGAEA.822026 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Griffiths, James D; Barker, Stephen; Hendry, Katharine R; Thornalley, David J R; van de Flierdt, Tina; Hall, Ian R; Anderson, Robert F (2013): Evidence of silicic acid leakage to the tropical Atlantic via Antarctic Intermediate Water during Marine Isotope Stage 4. Paleoceanography, 28(2), 307-318, https://doi.org/10.1002/palo.20030 dataset publication series 2013 ftpangaea https://doi.org/10.1594/PANGAEA.82202610.1002/palo.20030 2024-07-24T02:31:21Z Antarctic Intermediate Water (AAIW) and Subantarctic Mode Water (SAMW) are the main conduits for the supply of dissolved silicon (silicic acid) from the deep Southern Ocean (SO) to the low-latitude surface ocean and therefore have an important control on low-latitude diatom productivity. Enhanced supply of silicic acid by AAIW (and SAMW) during glacial periods may have enabled tropical diatoms to outcompete carbonate-producing phytoplankton, decreasing the relative export of inorganic to organic carbon to the deep ocean and lowering atmospheric pCO2. This mechanism is known as the "silicic acid leakage hypothesis" (SALH). Here we present records of neodymium and silicon isotopes from the western tropical Atlantic that provide the first direct evidence of increased silicic acid leakage from the Southern Ocean to the tropical Atlantic within AAIW during glacial Marine Isotope Stage 4 (~60-70 ka). This leakage was approximately coeval with enhanced diatom export in the NW Atlantic and across the eastern equatorial Atlantic and provides support for the SALH as a contributor to CO2 drawdown during full glacial development. Other/Unknown Material Antarc* Antarctic Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-61.233500,-13.650000,12.091833,0.563000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
Antarctic Intermediate Water (AAIW) and Subantarctic Mode Water (SAMW) are the main conduits for the supply of dissolved silicon (silicic acid) from the deep Southern Ocean (SO) to the low-latitude surface ocean and therefore have an important control on low-latitude diatom productivity. Enhanced supply of silicic acid by AAIW (and SAMW) during glacial periods may have enabled tropical diatoms to outcompete carbonate-producing phytoplankton, decreasing the relative export of inorganic to organic carbon to the deep ocean and lowering atmospheric pCO2. This mechanism is known as the "silicic acid leakage hypothesis" (SALH). Here we present records of neodymium and silicon isotopes from the western tropical Atlantic that provide the first direct evidence of increased silicic acid leakage from the Southern Ocean to the tropical Atlantic within AAIW during glacial Marine Isotope Stage 4 (~60-70 ka). This leakage was approximately coeval with enhanced diatom export in the NW Atlantic and across the eastern equatorial Atlantic and provides support for the SALH as a contributor to CO2 drawdown during full glacial development. |
format |
Other/Unknown Material |
author |
Griffiths, James D Barker, Stephen Hendry, Katharine R Thornalley, David J R van de Flierdt, Tina Hall, Ian R Anderson, Robert F |
spellingShingle |
Griffiths, James D Barker, Stephen Hendry, Katharine R Thornalley, David J R van de Flierdt, Tina Hall, Ian R Anderson, Robert F Geochemistry of tropical Atlantic sediments of Marine Isotope Stage 4 |
author_facet |
Griffiths, James D Barker, Stephen Hendry, Katharine R Thornalley, David J R van de Flierdt, Tina Hall, Ian R Anderson, Robert F |
author_sort |
Griffiths, James D |
title |
Geochemistry of tropical Atlantic sediments of Marine Isotope Stage 4 |
title_short |
Geochemistry of tropical Atlantic sediments of Marine Isotope Stage 4 |
title_full |
Geochemistry of tropical Atlantic sediments of Marine Isotope Stage 4 |
title_fullStr |
Geochemistry of tropical Atlantic sediments of Marine Isotope Stage 4 |
title_full_unstemmed |
Geochemistry of tropical Atlantic sediments of Marine Isotope Stage 4 |
title_sort |
geochemistry of tropical atlantic sediments of marine isotope stage 4 |
publisher |
PANGAEA |
publishDate |
2013 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.822026 https://doi.org/10.1594/PANGAEA.822026 |
op_coverage |
MEDIAN LATITUDE: 8.248889 * MEDIAN LONGITUDE: -45.372333 * SOUTH-BOUND LATITUDE: 0.563000 * WEST-BOUND LONGITUDE: -61.233500 * NORTH-BOUND LATITUDE: 12.091833 * EAST-BOUND LONGITUDE: -13.650000 * DATE/TIME START: 1983-03-19T00:00:00 * DATE/TIME END: 1999-08-01T00:00:00 |
long_lat |
ENVELOPE(-61.233500,-13.650000,12.091833,0.563000) |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Supplement to: Griffiths, James D; Barker, Stephen; Hendry, Katharine R; Thornalley, David J R; van de Flierdt, Tina; Hall, Ian R; Anderson, Robert F (2013): Evidence of silicic acid leakage to the tropical Atlantic via Antarctic Intermediate Water during Marine Isotope Stage 4. Paleoceanography, 28(2), 307-318, https://doi.org/10.1002/palo.20030 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.822026 https://doi.org/10.1594/PANGAEA.822026 |
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.82202610.1002/palo.20030 |
_version_ |
1810489145369296896 |