Table_1_Quantifying Lithogenic Inputs to the Southern Ocean Using Long-Lived Thorium Isotopes.xlsx
Thorium (Th) isotopes were applied to quantify the supply of lithogenic inputs from the Kerguelen Plateau to the Southern Ocean. The dissolved concentrations of 232 Th and 230 Th were measured following a novel pre-concentration method using the Nobias resin from 10 stations above and on the slopes...
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ftfrontimediafig:oai:figshare.com:article/12172566 2023-05-15T18:24:42+02:00 Table_1_Quantifying Lithogenic Inputs to the Southern Ocean Using Long-Lived Thorium Isotopes.xlsx Habacuc Pérez-Tribouillier Taryn L. Noble Ashley T. Townsend Andrew R. Bowie Zanna Chase 2020-04-22T04:23:30Z https://doi.org/10.3389/fmars.2020.00207.s001 https://figshare.com/articles/Table_1_Quantifying_Lithogenic_Inputs_to_the_Southern_Ocean_Using_Long-Lived_Thorium_Isotopes_xlsx/12172566 unknown doi:10.3389/fmars.2020.00207.s001 https://figshare.com/articles/Table_1_Quantifying_Lithogenic_Inputs_to_the_Southern_Ocean_Using_Long-Lived_Thorium_Isotopes_xlsx/12172566 CC BY 4.0 CC-BY Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering thorium Southern Ocean Kerguelen Plateau lithogenic natural fertilization GEOTRACES Dataset 2020 ftfrontimediafig https://doi.org/10.3389/fmars.2020.00207.s001 2020-04-22T22:53:14Z Thorium (Th) isotopes were applied to quantify the supply of lithogenic inputs from the Kerguelen Plateau to the Southern Ocean. The dissolved concentrations of 232 Th and 230 Th were measured following a novel pre-concentration method using the Nobias resin from 10 stations above and on the slopes of the plateau. Elevated 232 Th/ 230 Th ratios in the upper 500 m of the water column confirm the input of lithogenic material from islands, glaciers and the resuspension of shelf-deposited sediments. 230 Th concentrations were used to calculate a scavenging residence time for Th, which was then applied to calculate the flux of dissolved 232 Th required to match the observed concentrations of dissolved 232 Th. The 232 Th content of the lithogenic material from the Kerguelen Plateau was used with the solubility of Th reported in the literature, to estimate a lithogenic particle flux of 7 to 810 mg m –2 day –1 . This flux is comparable to fluxes obtained using sediment traps (8–777 mg m –2 day –1 ) in other continental-margin zones of the Southern Ocean. The flux of dissolved iron, generated by the dissolution of particles, was also calculated (4,189–6,800 nmol m –2 day –1 ) based on the iron/thorium ratio in the material from the Kerguelen Plateau. This is higher than previous estimates (1,342 nmol m –2 day –1 ), suggesting the dissolution of particles as the missing source of iron, thus closing the iron budget of the region. This study confirms the utility of long-lived Th isotopes to quantify lithogenic inputs from continental margin settings. Dataset Southern Ocean Frontiers: Figshare Southern Ocean Kerguelen |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering thorium Southern Ocean Kerguelen Plateau lithogenic natural fertilization GEOTRACES |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering thorium Southern Ocean Kerguelen Plateau lithogenic natural fertilization GEOTRACES Habacuc Pérez-Tribouillier Taryn L. Noble Ashley T. Townsend Andrew R. Bowie Zanna Chase Table_1_Quantifying Lithogenic Inputs to the Southern Ocean Using Long-Lived Thorium Isotopes.xlsx |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering thorium Southern Ocean Kerguelen Plateau lithogenic natural fertilization GEOTRACES |
description |
Thorium (Th) isotopes were applied to quantify the supply of lithogenic inputs from the Kerguelen Plateau to the Southern Ocean. The dissolved concentrations of 232 Th and 230 Th were measured following a novel pre-concentration method using the Nobias resin from 10 stations above and on the slopes of the plateau. Elevated 232 Th/ 230 Th ratios in the upper 500 m of the water column confirm the input of lithogenic material from islands, glaciers and the resuspension of shelf-deposited sediments. 230 Th concentrations were used to calculate a scavenging residence time for Th, which was then applied to calculate the flux of dissolved 232 Th required to match the observed concentrations of dissolved 232 Th. The 232 Th content of the lithogenic material from the Kerguelen Plateau was used with the solubility of Th reported in the literature, to estimate a lithogenic particle flux of 7 to 810 mg m –2 day –1 . This flux is comparable to fluxes obtained using sediment traps (8–777 mg m –2 day –1 ) in other continental-margin zones of the Southern Ocean. The flux of dissolved iron, generated by the dissolution of particles, was also calculated (4,189–6,800 nmol m –2 day –1 ) based on the iron/thorium ratio in the material from the Kerguelen Plateau. This is higher than previous estimates (1,342 nmol m –2 day –1 ), suggesting the dissolution of particles as the missing source of iron, thus closing the iron budget of the region. This study confirms the utility of long-lived Th isotopes to quantify lithogenic inputs from continental margin settings. |
format |
Dataset |
author |
Habacuc Pérez-Tribouillier Taryn L. Noble Ashley T. Townsend Andrew R. Bowie Zanna Chase |
author_facet |
Habacuc Pérez-Tribouillier Taryn L. Noble Ashley T. Townsend Andrew R. Bowie Zanna Chase |
author_sort |
Habacuc Pérez-Tribouillier |
title |
Table_1_Quantifying Lithogenic Inputs to the Southern Ocean Using Long-Lived Thorium Isotopes.xlsx |
title_short |
Table_1_Quantifying Lithogenic Inputs to the Southern Ocean Using Long-Lived Thorium Isotopes.xlsx |
title_full |
Table_1_Quantifying Lithogenic Inputs to the Southern Ocean Using Long-Lived Thorium Isotopes.xlsx |
title_fullStr |
Table_1_Quantifying Lithogenic Inputs to the Southern Ocean Using Long-Lived Thorium Isotopes.xlsx |
title_full_unstemmed |
Table_1_Quantifying Lithogenic Inputs to the Southern Ocean Using Long-Lived Thorium Isotopes.xlsx |
title_sort |
table_1_quantifying lithogenic inputs to the southern ocean using long-lived thorium isotopes.xlsx |
publishDate |
2020 |
url |
https://doi.org/10.3389/fmars.2020.00207.s001 https://figshare.com/articles/Table_1_Quantifying_Lithogenic_Inputs_to_the_Southern_Ocean_Using_Long-Lived_Thorium_Isotopes_xlsx/12172566 |
geographic |
Southern Ocean Kerguelen |
geographic_facet |
Southern Ocean Kerguelen |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
doi:10.3389/fmars.2020.00207.s001 https://figshare.com/articles/Table_1_Quantifying_Lithogenic_Inputs_to_the_Southern_Ocean_Using_Long-Lived_Thorium_Isotopes_xlsx/12172566 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2020.00207.s001 |
_version_ |
1766205512429338624 |