Elemental composition of suspended matter in the scotia-weddell confluence area during spring and summer 1988 (epos leg 2)
During austral spring and summer 1988 the upper 500 m of water column in the Scotia-Weddell Confluence was sampled for the elemental composition of total suspended matter. For particulate organic carbon surface water concentrations ranged between 2.5 and 15-mu-mol/l, with an estimated 19 to 47% of t...
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ftunivleuven:oai:lirias.kuleuven.be:123456789/46542 2023-05-15T18:01:58+02:00 Elemental composition of suspended matter in the scotia-weddell confluence area during spring and summer 1988 (epos leg 2) Dehairs, F Goeyens, Leo Stroobants, N Mathot, S 1992 https://lirias.kuleuven.be/handle/123456789/46542 en eng Springer verlag Polar biology vol:12 issue:1 pages:25-33 https://lirias.kuleuven.be/handle/123456789/46542 0722-4060 particulate organic-matter southern-ocean ice-edge sea ice iron chemistry barite silica Description (Metadata) only IT article 1992 ftunivleuven 2015-12-22T15:04:58Z During austral spring and summer 1988 the upper 500 m of water column in the Scotia-Weddell Confluence was sampled for the elemental composition of total suspended matter. For particulate organic carbon surface water concentrations ranged between 2.5 and 15-mu-mol/l, with an estimated 19 to 47% of this pool being detrital carbon. In late November, the highest surface water particulate organic carbon concentrations (15-mu-mol/l) occurred in the Confluence area where they coincided with a maximum in particulate Si (1.7-mu-mol/l). Later in the season particulate Si in the Confluence area decreased to less-than-or-equal-to 0.3-mu-mol/l. In the Scotia Sea on the contrary, surface water particulate Si increased with time and reached 3-mu-mol/l in late December. For particulate Ca and Sr in surface water, strong gradients are observed across the Scotia Front (e.g. Ca: from 230 to 10 nmol/l; Sr: from 1.0 to 0.1 nmol/1), with highest concentrations in the Scotia Sea. In general, these distributions are confirmed by the observations on plankton species composition, done by other participants. In the Scotia Sea heavily calcified coccolithophorids and diatoms occurred throughout the season, while in the Confluence area heavily calcified coccolithophorids were absent and a switch-over from diatom to naked flagellate dominance was observed following a krill event. In the surface waters, the lithogenic Si fraction represents on average only 4% of the total particulate Si content. However, this fraction reaches 60% below 100 m depth in the Confluence area, due mainly to the presence of a sub-surface maximum in the aluminosilicate load (particulate Al content up to 30 nmol/l), probably reflecting advection of resuspended shelf sediments. Subsurface Ba/barite concentrations are highest in the Scotia Sea (280 pmol/l) and decrease through the Scotia Front to reach values of 100 pmol/l and less in the Confluence area, the marginal ice zone and the closed pack ice zone. status: published Article in Journal/Newspaper Polar Biology Scotia Sea Sea ice Southern Ocean KU Leuven: Lirias Southern Ocean Austral Scotia Sea Weddell |
institution |
Open Polar |
collection |
KU Leuven: Lirias |
op_collection_id |
ftunivleuven |
language |
English |
topic |
particulate organic-matter southern-ocean ice-edge sea ice iron chemistry barite silica |
spellingShingle |
particulate organic-matter southern-ocean ice-edge sea ice iron chemistry barite silica Dehairs, F Goeyens, Leo Stroobants, N Mathot, S Elemental composition of suspended matter in the scotia-weddell confluence area during spring and summer 1988 (epos leg 2) |
topic_facet |
particulate organic-matter southern-ocean ice-edge sea ice iron chemistry barite silica |
description |
During austral spring and summer 1988 the upper 500 m of water column in the Scotia-Weddell Confluence was sampled for the elemental composition of total suspended matter. For particulate organic carbon surface water concentrations ranged between 2.5 and 15-mu-mol/l, with an estimated 19 to 47% of this pool being detrital carbon. In late November, the highest surface water particulate organic carbon concentrations (15-mu-mol/l) occurred in the Confluence area where they coincided with a maximum in particulate Si (1.7-mu-mol/l). Later in the season particulate Si in the Confluence area decreased to less-than-or-equal-to 0.3-mu-mol/l. In the Scotia Sea on the contrary, surface water particulate Si increased with time and reached 3-mu-mol/l in late December. For particulate Ca and Sr in surface water, strong gradients are observed across the Scotia Front (e.g. Ca: from 230 to 10 nmol/l; Sr: from 1.0 to 0.1 nmol/1), with highest concentrations in the Scotia Sea. In general, these distributions are confirmed by the observations on plankton species composition, done by other participants. In the Scotia Sea heavily calcified coccolithophorids and diatoms occurred throughout the season, while in the Confluence area heavily calcified coccolithophorids were absent and a switch-over from diatom to naked flagellate dominance was observed following a krill event. In the surface waters, the lithogenic Si fraction represents on average only 4% of the total particulate Si content. However, this fraction reaches 60% below 100 m depth in the Confluence area, due mainly to the presence of a sub-surface maximum in the aluminosilicate load (particulate Al content up to 30 nmol/l), probably reflecting advection of resuspended shelf sediments. Subsurface Ba/barite concentrations are highest in the Scotia Sea (280 pmol/l) and decrease through the Scotia Front to reach values of 100 pmol/l and less in the Confluence area, the marginal ice zone and the closed pack ice zone. status: published |
format |
Article in Journal/Newspaper |
author |
Dehairs, F Goeyens, Leo Stroobants, N Mathot, S |
author_facet |
Dehairs, F Goeyens, Leo Stroobants, N Mathot, S |
author_sort |
Dehairs, F |
title |
Elemental composition of suspended matter in the scotia-weddell confluence area during spring and summer 1988 (epos leg 2) |
title_short |
Elemental composition of suspended matter in the scotia-weddell confluence area during spring and summer 1988 (epos leg 2) |
title_full |
Elemental composition of suspended matter in the scotia-weddell confluence area during spring and summer 1988 (epos leg 2) |
title_fullStr |
Elemental composition of suspended matter in the scotia-weddell confluence area during spring and summer 1988 (epos leg 2) |
title_full_unstemmed |
Elemental composition of suspended matter in the scotia-weddell confluence area during spring and summer 1988 (epos leg 2) |
title_sort |
elemental composition of suspended matter in the scotia-weddell confluence area during spring and summer 1988 (epos leg 2) |
publisher |
Springer verlag |
publishDate |
1992 |
url |
https://lirias.kuleuven.be/handle/123456789/46542 |
geographic |
Southern Ocean Austral Scotia Sea Weddell |
geographic_facet |
Southern Ocean Austral Scotia Sea Weddell |
genre |
Polar Biology Scotia Sea Sea ice Southern Ocean |
genre_facet |
Polar Biology Scotia Sea Sea ice Southern Ocean |
op_relation |
Polar biology vol:12 issue:1 pages:25-33 https://lirias.kuleuven.be/handle/123456789/46542 0722-4060 |
_version_ |
1766171579499151360 |