(Table 2) 230Th, 230Th xs and 232Th concentrations in dissolved, particulate and total (dissolved+small particles) for all KEOPS stations, Marion Dufresne cruise MD145
In the context of the KErguelen Ocean and Plateau compared Study (KEOPS, 19 January-13 February 2005), particle dynamics were investigated using thorium isotope measurements over and off the Kerguelen plateau. Dissolved and particulate 230Th and 232Th samples were collected at nine stations. Dissolv...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.858527 2023-05-15T14:03:05+02:00 (Table 2) 230Th, 230Th xs and 232Th concentrations in dissolved, particulate and total (dissolved+small particles) for all KEOPS stations, Marion Dufresne cruise MD145 Venchiarutti, Célia Jeandel, Catherine Roy-Barman, Matthieu MEDIAN LATITUDE: -51.143400 * MEDIAN LONGITUDE: 73.856700 * SOUTH-BOUND LATITUDE: -53.186000 * WEST-BOUND LONGITUDE: 68.435000 * NORTH-BOUND LATITUDE: -49.013000 * EAST-BOUND LONGITUDE: 77.965000 * DATE/TIME START: 2005-01-21T00:00:00 * DATE/TIME END: 2005-02-10T00:00:00 * MINIMUM DEPTH, water: 0 m * MAXIMUM DEPTH, water: 3190 m 2008-03-03 text/tab-separated-values, 767 data points https://doi.pangaea.de/10.1594/PANGAEA.858527 https://doi.org/10.1594/PANGAEA.858527 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.858527 https://doi.org/10.1594/PANGAEA.858527 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Venchiarutti, Célia; Jeandel, Catherine; Roy-Barman, Matthieu (2008): Particle dynamics study in the wake of Kerguelen Island using thorium isotopes. Deep Sea Research Part I: Oceanographic Research Papers, 55(10), 1343-1363, https://doi.org/10.1016/j.dsr.2008.05.015 CTD/Rosette CTD-RO Date/Time of event DEPTH water Event label Indian Ocean Latitude of event Longitude of event Marion Dufresne (1995) MD145 MD145_A11 MD145_A3-3 MD145_A3-4 MD145_B1 MD145_B11 MD145_B5 MD145_C1 MD145_C11 MD145_C5 MD145_Kerfix OISO_12 KEOPS,35MF20050113 Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 Thorium-230 dissolved standard deviation particulate Thorium-230 excess Dataset 2008 ftpangaea https://doi.org/10.1594/PANGAEA.858527 https://doi.org/10.1016/j.dsr.2008.05.015 2023-01-20T09:06:57Z In the context of the KErguelen Ocean and Plateau compared Study (KEOPS, 19 January-13 February 2005), particle dynamics were investigated using thorium isotope measurements over and off the Kerguelen plateau. Dissolved and particulate 230Th and 232Th samples were collected at nine stations. Dissolved excess 230Th concentrations (230Thxs) vary from 0.5 to 20.8 fg/kg and particulate 230Thxs concentrations from 0.1 to 10.0 fg/kg. Dissolved and particulate 232Th concentration ranges are 16.8-450.2 pg/kg and 3.8-502.8 pg/kg, respectively. The 230Thxs concentrations increase linearly with depth down to the bottom at most of the plateau stations and down to 1000 m at the off-plateau stations. This linear trend is observed down to the bottom (1550 m) at Kerfix, the open-ocean "upstream" station located west of the Kerguelen plateau. A simple reversible scavenging model applied to these data allowed the estimation of adsorption rate constant (k1~=0.2-0.8 per year), desorption rate constant (k-1~=1-8 per year) and partition coefficients (average K=0.16±0.07). Calculated particle settling velocities S deduced from this simple model are ca. 500 m/year at most of the plateau stations and 800 m/year at all the off-plateau stations. The plateau settling velocities are relatively low for such a productive site, compared to the surrounding HNLC areas. The difference might reflect the fact that lateral advection is neglected in this model. Taking this advection into account allows the reconstruction of the observed 230Thxs linear distributions, but only if faster settling velocities are considered. This implies that the 1D model strongly underestimates the settling velocity of the particles. In the deep layers, the occurrence of intense boundary scavenging along the escarpment due to bottom sediment re-suspension and interaction with a nepheloid layer, yielding a removal of ~50% of the Th stock along the northwestward transect, is suggested. Dataset Antarc* Antarctic Arctic Sea ice PANGAEA - Data Publisher for Earth & Environmental Science Arctic Antarctic Kerguelen Indian ENVELOPE(68.435000,77.965000,-49.013000,-53.186000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
CTD/Rosette CTD-RO Date/Time of event DEPTH water Event label Indian Ocean Latitude of event Longitude of event Marion Dufresne (1995) MD145 MD145_A11 MD145_A3-3 MD145_A3-4 MD145_B1 MD145_B11 MD145_B5 MD145_C1 MD145_C11 MD145_C5 MD145_Kerfix OISO_12 KEOPS,35MF20050113 Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 Thorium-230 dissolved standard deviation particulate Thorium-230 excess |
spellingShingle |
CTD/Rosette CTD-RO Date/Time of event DEPTH water Event label Indian Ocean Latitude of event Longitude of event Marion Dufresne (1995) MD145 MD145_A11 MD145_A3-3 MD145_A3-4 MD145_B1 MD145_B11 MD145_B5 MD145_C1 MD145_C11 MD145_C5 MD145_Kerfix OISO_12 KEOPS,35MF20050113 Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 Thorium-230 dissolved standard deviation particulate Thorium-230 excess Venchiarutti, Célia Jeandel, Catherine Roy-Barman, Matthieu (Table 2) 230Th, 230Th xs and 232Th concentrations in dissolved, particulate and total (dissolved+small particles) for all KEOPS stations, Marion Dufresne cruise MD145 |
topic_facet |
CTD/Rosette CTD-RO Date/Time of event DEPTH water Event label Indian Ocean Latitude of event Longitude of event Marion Dufresne (1995) MD145 MD145_A11 MD145_A3-3 MD145_A3-4 MD145_B1 MD145_B11 MD145_B5 MD145_C1 MD145_C11 MD145_C5 MD145_Kerfix OISO_12 KEOPS,35MF20050113 Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 Thorium-230 dissolved standard deviation particulate Thorium-230 excess |
description |
In the context of the KErguelen Ocean and Plateau compared Study (KEOPS, 19 January-13 February 2005), particle dynamics were investigated using thorium isotope measurements over and off the Kerguelen plateau. Dissolved and particulate 230Th and 232Th samples were collected at nine stations. Dissolved excess 230Th concentrations (230Thxs) vary from 0.5 to 20.8 fg/kg and particulate 230Thxs concentrations from 0.1 to 10.0 fg/kg. Dissolved and particulate 232Th concentration ranges are 16.8-450.2 pg/kg and 3.8-502.8 pg/kg, respectively. The 230Thxs concentrations increase linearly with depth down to the bottom at most of the plateau stations and down to 1000 m at the off-plateau stations. This linear trend is observed down to the bottom (1550 m) at Kerfix, the open-ocean "upstream" station located west of the Kerguelen plateau. A simple reversible scavenging model applied to these data allowed the estimation of adsorption rate constant (k1~=0.2-0.8 per year), desorption rate constant (k-1~=1-8 per year) and partition coefficients (average K=0.16±0.07). Calculated particle settling velocities S deduced from this simple model are ca. 500 m/year at most of the plateau stations and 800 m/year at all the off-plateau stations. The plateau settling velocities are relatively low for such a productive site, compared to the surrounding HNLC areas. The difference might reflect the fact that lateral advection is neglected in this model. Taking this advection into account allows the reconstruction of the observed 230Thxs linear distributions, but only if faster settling velocities are considered. This implies that the 1D model strongly underestimates the settling velocity of the particles. In the deep layers, the occurrence of intense boundary scavenging along the escarpment due to bottom sediment re-suspension and interaction with a nepheloid layer, yielding a removal of ~50% of the Th stock along the northwestward transect, is suggested. |
format |
Dataset |
author |
Venchiarutti, Célia Jeandel, Catherine Roy-Barman, Matthieu |
author_facet |
Venchiarutti, Célia Jeandel, Catherine Roy-Barman, Matthieu |
author_sort |
Venchiarutti, Célia |
title |
(Table 2) 230Th, 230Th xs and 232Th concentrations in dissolved, particulate and total (dissolved+small particles) for all KEOPS stations, Marion Dufresne cruise MD145 |
title_short |
(Table 2) 230Th, 230Th xs and 232Th concentrations in dissolved, particulate and total (dissolved+small particles) for all KEOPS stations, Marion Dufresne cruise MD145 |
title_full |
(Table 2) 230Th, 230Th xs and 232Th concentrations in dissolved, particulate and total (dissolved+small particles) for all KEOPS stations, Marion Dufresne cruise MD145 |
title_fullStr |
(Table 2) 230Th, 230Th xs and 232Th concentrations in dissolved, particulate and total (dissolved+small particles) for all KEOPS stations, Marion Dufresne cruise MD145 |
title_full_unstemmed |
(Table 2) 230Th, 230Th xs and 232Th concentrations in dissolved, particulate and total (dissolved+small particles) for all KEOPS stations, Marion Dufresne cruise MD145 |
title_sort |
(table 2) 230th, 230th xs and 232th concentrations in dissolved, particulate and total (dissolved+small particles) for all keops stations, marion dufresne cruise md145 |
publisher |
PANGAEA |
publishDate |
2008 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.858527 https://doi.org/10.1594/PANGAEA.858527 |
op_coverage |
MEDIAN LATITUDE: -51.143400 * MEDIAN LONGITUDE: 73.856700 * SOUTH-BOUND LATITUDE: -53.186000 * WEST-BOUND LONGITUDE: 68.435000 * NORTH-BOUND LATITUDE: -49.013000 * EAST-BOUND LONGITUDE: 77.965000 * DATE/TIME START: 2005-01-21T00:00:00 * DATE/TIME END: 2005-02-10T00:00:00 * MINIMUM DEPTH, water: 0 m * MAXIMUM DEPTH, water: 3190 m |
long_lat |
ENVELOPE(68.435000,77.965000,-49.013000,-53.186000) |
geographic |
Arctic Antarctic Kerguelen Indian |
geographic_facet |
Arctic Antarctic Kerguelen Indian |
genre |
Antarc* Antarctic Arctic Sea ice |
genre_facet |
Antarc* Antarctic Arctic Sea ice |
op_source |
Supplement to: Venchiarutti, Célia; Jeandel, Catherine; Roy-Barman, Matthieu (2008): Particle dynamics study in the wake of Kerguelen Island using thorium isotopes. Deep Sea Research Part I: Oceanographic Research Papers, 55(10), 1343-1363, https://doi.org/10.1016/j.dsr.2008.05.015 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.858527 https://doi.org/10.1594/PANGAEA.858527 |
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.858527 https://doi.org/10.1016/j.dsr.2008.05.015 |
_version_ |
1766273601888059392 |