Radionuclides in the water column at stations near the Antarctic Polar Front in the South Atlantic
Vertical profiles of dissolved and particulate 230Th and 231Pa were obtained across the Antarctic Circumpolar Current (ACC) in the southern Atlantic. North of the Polar Front, dissolved and total 230Th increase with depth in conformity with published scavenging models. There is no depletion of 230Th...
Main Authors: | , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
1993
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.730453 https://doi.org/10.1594/PANGAEA.730453 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.730453 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.730453 2023-05-15T13:42:09+02:00 Radionuclides in the water column at stations near the Antarctic Polar Front in the South Atlantic Rutgers van der Loeff, Michiel M Berger, Gijs W MEDIAN LATITUDE: -52.182574 * MEDIAN LONGITUDE: -2.736704 * SOUTH-BOUND LATITUDE: -60.663000 * WEST-BOUND LONGITUDE: -27.843333 * NORTH-BOUND LATITUDE: -44.477000 * EAST-BOUND LONGITUDE: 10.452000 * DATE/TIME START: 1989-11-05T05:00:00 * DATE/TIME END: 1991-03-20T00:00:00 1993-01-14 application/zip, 9 datasets https://doi.pangaea.de/10.1594/PANGAEA.730453 https://doi.org/10.1594/PANGAEA.730453 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.730453 https://doi.org/10.1594/PANGAEA.730453 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Rutgers van der Loeff, Michiel M; Berger, Gijs W (1993): Scavenging of 230Th and 231Pa near the antarctic polar front in the South Atlantic. Deep Sea Research Part I: Oceanographic Research Papers, 40(2), 339-357, https://doi.org/10.1016/0967-0637(93)90007-P Agulhas Basin ANT-IX/3 ANT-VIII/3 Atlantic Ridge AWI_MarGeoChem AWI_Paleo Marine Geochemistry @ AWI Maud Rise Meteor Rise MULT Multiple investigations Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS16 PS16/267 PS16/281 PS16/294 PS16/311 PS16/321 PS16/342 PS16/362 PS16/370 PS1751-8 PS1755-2 PS1759-5 PS1768-2 PS1772-2 PS1777-8 PS1782-7 PS1785-1 PS18 PS18/227 PS2072 Shona Ridge South Sandwich Basin South Sandwich Trough Water sample WS Dataset 1993 ftpangaea https://doi.org/10.1594/PANGAEA.730453 https://doi.org/10.1016/0967-0637(93)90007-P 2023-01-20T07:31:37Z Vertical profiles of dissolved and particulate 230Th and 231Pa were obtained across the Antarctic Circumpolar Current (ACC) in the southern Atlantic. North of the Polar Front, dissolved and total 230Th increase with depth in conformity with published scavenging models. There is no depletion of 230Th or 231Pa in the water column south of the Polar Front, thought to be an area of enhanced biological productivity. 230Th concentrations increase three-fold to the Weddell Sea across the ACC. Dissolved and total 231Pa concentrations are relatively constant below 500 m depth at about 0.3 dpm m**-3, and change little with depth or latitude. The results from the Weddell Gyre are explained by a mixing-scavenging model that takes into account the input of lower Circumpolar Deep Water through upwelling, which is the main source of water in the Weddell Gyre and is enriched in 230Th but not in 231Pa. 230Th accumulates in the Weddell Gyre as a result of a reduction in the scavenging rate and by ingrowth from 234U. Ingrowth is more significant for 230Th than for 231Pa because the residence time of water in the gyre (about 35 years) is similar to the scavenging residence time of Th in the south Atlantic (29 years) but shorter than that of Pa (120 years). It is argued that changes in 230Th accumulation in the past may reflect changes in water residence time and in the formation rate of Weddell Sea Deep Water. Dataset Antarc* Antarctic Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science Agulhas Basin ENVELOPE(27.000,27.000,-47.000,-47.000) Antarctic Maud Rise ENVELOPE(3.000,3.000,-66.000,-66.000) Shona Ridge ENVELOPE(2.750,2.750,-51.000,-51.000) The Antarctic Weddell Weddell Sea ENVELOPE(-27.843333,10.452000,-44.477000,-60.663000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Agulhas Basin ANT-IX/3 ANT-VIII/3 Atlantic Ridge AWI_MarGeoChem AWI_Paleo Marine Geochemistry @ AWI Maud Rise Meteor Rise MULT Multiple investigations Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS16 PS16/267 PS16/281 PS16/294 PS16/311 PS16/321 PS16/342 PS16/362 PS16/370 PS1751-8 PS1755-2 PS1759-5 PS1768-2 PS1772-2 PS1777-8 PS1782-7 PS1785-1 PS18 PS18/227 PS2072 Shona Ridge South Sandwich Basin South Sandwich Trough Water sample WS |
spellingShingle |
Agulhas Basin ANT-IX/3 ANT-VIII/3 Atlantic Ridge AWI_MarGeoChem AWI_Paleo Marine Geochemistry @ AWI Maud Rise Meteor Rise MULT Multiple investigations Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS16 PS16/267 PS16/281 PS16/294 PS16/311 PS16/321 PS16/342 PS16/362 PS16/370 PS1751-8 PS1755-2 PS1759-5 PS1768-2 PS1772-2 PS1777-8 PS1782-7 PS1785-1 PS18 PS18/227 PS2072 Shona Ridge South Sandwich Basin South Sandwich Trough Water sample WS Rutgers van der Loeff, Michiel M Berger, Gijs W Radionuclides in the water column at stations near the Antarctic Polar Front in the South Atlantic |
topic_facet |
Agulhas Basin ANT-IX/3 ANT-VIII/3 Atlantic Ridge AWI_MarGeoChem AWI_Paleo Marine Geochemistry @ AWI Maud Rise Meteor Rise MULT Multiple investigations Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS16 PS16/267 PS16/281 PS16/294 PS16/311 PS16/321 PS16/342 PS16/362 PS16/370 PS1751-8 PS1755-2 PS1759-5 PS1768-2 PS1772-2 PS1777-8 PS1782-7 PS1785-1 PS18 PS18/227 PS2072 Shona Ridge South Sandwich Basin South Sandwich Trough Water sample WS |
description |
Vertical profiles of dissolved and particulate 230Th and 231Pa were obtained across the Antarctic Circumpolar Current (ACC) in the southern Atlantic. North of the Polar Front, dissolved and total 230Th increase with depth in conformity with published scavenging models. There is no depletion of 230Th or 231Pa in the water column south of the Polar Front, thought to be an area of enhanced biological productivity. 230Th concentrations increase three-fold to the Weddell Sea across the ACC. Dissolved and total 231Pa concentrations are relatively constant below 500 m depth at about 0.3 dpm m**-3, and change little with depth or latitude. The results from the Weddell Gyre are explained by a mixing-scavenging model that takes into account the input of lower Circumpolar Deep Water through upwelling, which is the main source of water in the Weddell Gyre and is enriched in 230Th but not in 231Pa. 230Th accumulates in the Weddell Gyre as a result of a reduction in the scavenging rate and by ingrowth from 234U. Ingrowth is more significant for 230Th than for 231Pa because the residence time of water in the gyre (about 35 years) is similar to the scavenging residence time of Th in the south Atlantic (29 years) but shorter than that of Pa (120 years). It is argued that changes in 230Th accumulation in the past may reflect changes in water residence time and in the formation rate of Weddell Sea Deep Water. |
format |
Dataset |
author |
Rutgers van der Loeff, Michiel M Berger, Gijs W |
author_facet |
Rutgers van der Loeff, Michiel M Berger, Gijs W |
author_sort |
Rutgers van der Loeff, Michiel M |
title |
Radionuclides in the water column at stations near the Antarctic Polar Front in the South Atlantic |
title_short |
Radionuclides in the water column at stations near the Antarctic Polar Front in the South Atlantic |
title_full |
Radionuclides in the water column at stations near the Antarctic Polar Front in the South Atlantic |
title_fullStr |
Radionuclides in the water column at stations near the Antarctic Polar Front in the South Atlantic |
title_full_unstemmed |
Radionuclides in the water column at stations near the Antarctic Polar Front in the South Atlantic |
title_sort |
radionuclides in the water column at stations near the antarctic polar front in the south atlantic |
publisher |
PANGAEA |
publishDate |
1993 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.730453 https://doi.org/10.1594/PANGAEA.730453 |
op_coverage |
MEDIAN LATITUDE: -52.182574 * MEDIAN LONGITUDE: -2.736704 * SOUTH-BOUND LATITUDE: -60.663000 * WEST-BOUND LONGITUDE: -27.843333 * NORTH-BOUND LATITUDE: -44.477000 * EAST-BOUND LONGITUDE: 10.452000 * DATE/TIME START: 1989-11-05T05:00:00 * DATE/TIME END: 1991-03-20T00:00:00 |
long_lat |
ENVELOPE(27.000,27.000,-47.000,-47.000) ENVELOPE(3.000,3.000,-66.000,-66.000) ENVELOPE(2.750,2.750,-51.000,-51.000) ENVELOPE(-27.843333,10.452000,-44.477000,-60.663000) |
geographic |
Agulhas Basin Antarctic Maud Rise Shona Ridge The Antarctic Weddell Weddell Sea |
geographic_facet |
Agulhas Basin Antarctic Maud Rise Shona Ridge The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Weddell Sea |
genre_facet |
Antarc* Antarctic Weddell Sea |
op_source |
Supplement to: Rutgers van der Loeff, Michiel M; Berger, Gijs W (1993): Scavenging of 230Th and 231Pa near the antarctic polar front in the South Atlantic. Deep Sea Research Part I: Oceanographic Research Papers, 40(2), 339-357, https://doi.org/10.1016/0967-0637(93)90007-P |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.730453 https://doi.org/10.1594/PANGAEA.730453 |
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.730453 https://doi.org/10.1016/0967-0637(93)90007-P |
_version_ |
1766163650008055808 |