Variability in nutrient concentrations around Elephant Island, Antarctica, during 1991-1993
The nutrient status of the various water mass structures within a large sampling grid around Elephant Island are reported and the nutrient concentrations relative to jata from the physical and biological components of the Antarctic Marine Living Resources Programme are discussed. Concentrations of s...
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Norwegian Polar Institute
1995
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ftjpolarres:oai:journals.openacademia.net:article/1935 2023-05-15T14:01:21+02:00 Variability in nutrient concentrations around Elephant Island, Antarctica, during 1991-1993 Silva S., Nelson Helbling, E. Walter Villafañe, Virginia Amos, Anthony F. Holm-Hansen, Osmund 1995-01-06 application/pdf https://polarresearch.net/index.php/polar/article/view/1935 https://doi.org/10.3402/polar.v14i1.6652 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/1935/5184 https://polarresearch.net/index.php/polar/article/view/1935 doi:10.3402/polar.v14i1.6652 Copyright (c) 2018 Polar Research Polar Research; Vol. 14 No. 1 (1995); 69-82 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1995 ftjpolarres https://doi.org/10.3402/polar.v14i1.6652 2021-11-11T19:11:42Z The nutrient status of the various water mass structures within a large sampling grid around Elephant Island are reported and the nutrient concentrations relative to jata from the physical and biological components of the Antarctic Marine Living Resources Programme are discussed. Concentrations of silicic acid, nitrate and phosphate (Si/N/P) were measured in the upper water column during January-March of three successive years. Samples were taken from eleven depths at 17 stations in 1991, and at four depths at 144 stations in 1992 and 182 stations in 1993. There was considerable variability in the concentrations of all three nutrients within the study area, but silicic acid showed the greatest variance among the water masses present in the sampling grid. The ratios (Si/N/P) of the nutrient deficits (difference in winter and summer values) in the upper 100 m differed considerably in Drake Passage waters as compared to Bransfield Strait waters, with both nitrate and silicic acid showing the greatest variance. Nutrient deficits did not increase from January to February, indicating that rates of replenishment of nutrients to the euphotic zone by physical processes and/or biological regeneration were approximately equal to the rate of uptake and assimilation by phytoplankton during that time period. The seasonal deficits, however, were substantial. Estimates of daily rates of primary production based on these nutrient deficits were comparable to the rates as measured by radiocarbon for Drake Passage waters, but much smaller for Bransfield Strait waters. Article in Journal/Newspaper Antarc* Antarctic Antarctica Bransfield Strait Drake Passage Elephant Island Polar Research Polar Research (E-Journal) Antarctic The Antarctic Drake Passage Bransfield Strait Elephant Island ENVELOPE(-55.184,-55.184,-61.085,-61.085) Jata ENVELOPE(-20.217,-20.217,64.210,64.210) Polar Research 14 1 69 82 |
institution |
Open Polar |
collection |
Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
description |
The nutrient status of the various water mass structures within a large sampling grid around Elephant Island are reported and the nutrient concentrations relative to jata from the physical and biological components of the Antarctic Marine Living Resources Programme are discussed. Concentrations of silicic acid, nitrate and phosphate (Si/N/P) were measured in the upper water column during January-March of three successive years. Samples were taken from eleven depths at 17 stations in 1991, and at four depths at 144 stations in 1992 and 182 stations in 1993. There was considerable variability in the concentrations of all three nutrients within the study area, but silicic acid showed the greatest variance among the water masses present in the sampling grid. The ratios (Si/N/P) of the nutrient deficits (difference in winter and summer values) in the upper 100 m differed considerably in Drake Passage waters as compared to Bransfield Strait waters, with both nitrate and silicic acid showing the greatest variance. Nutrient deficits did not increase from January to February, indicating that rates of replenishment of nutrients to the euphotic zone by physical processes and/or biological regeneration were approximately equal to the rate of uptake and assimilation by phytoplankton during that time period. The seasonal deficits, however, were substantial. Estimates of daily rates of primary production based on these nutrient deficits were comparable to the rates as measured by radiocarbon for Drake Passage waters, but much smaller for Bransfield Strait waters. |
format |
Article in Journal/Newspaper |
author |
Silva S., Nelson Helbling, E. Walter Villafañe, Virginia Amos, Anthony F. Holm-Hansen, Osmund |
spellingShingle |
Silva S., Nelson Helbling, E. Walter Villafañe, Virginia Amos, Anthony F. Holm-Hansen, Osmund Variability in nutrient concentrations around Elephant Island, Antarctica, during 1991-1993 |
author_facet |
Silva S., Nelson Helbling, E. Walter Villafañe, Virginia Amos, Anthony F. Holm-Hansen, Osmund |
author_sort |
Silva S., Nelson |
title |
Variability in nutrient concentrations around Elephant Island, Antarctica, during 1991-1993 |
title_short |
Variability in nutrient concentrations around Elephant Island, Antarctica, during 1991-1993 |
title_full |
Variability in nutrient concentrations around Elephant Island, Antarctica, during 1991-1993 |
title_fullStr |
Variability in nutrient concentrations around Elephant Island, Antarctica, during 1991-1993 |
title_full_unstemmed |
Variability in nutrient concentrations around Elephant Island, Antarctica, during 1991-1993 |
title_sort |
variability in nutrient concentrations around elephant island, antarctica, during 1991-1993 |
publisher |
Norwegian Polar Institute |
publishDate |
1995 |
url |
https://polarresearch.net/index.php/polar/article/view/1935 https://doi.org/10.3402/polar.v14i1.6652 |
long_lat |
ENVELOPE(-55.184,-55.184,-61.085,-61.085) ENVELOPE(-20.217,-20.217,64.210,64.210) |
geographic |
Antarctic The Antarctic Drake Passage Bransfield Strait Elephant Island Jata |
geographic_facet |
Antarctic The Antarctic Drake Passage Bransfield Strait Elephant Island Jata |
genre |
Antarc* Antarctic Antarctica Bransfield Strait Drake Passage Elephant Island Polar Research |
genre_facet |
Antarc* Antarctic Antarctica Bransfield Strait Drake Passage Elephant Island Polar Research |
op_source |
Polar Research; Vol. 14 No. 1 (1995); 69-82 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/1935/5184 https://polarresearch.net/index.php/polar/article/view/1935 doi:10.3402/polar.v14i1.6652 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v14i1.6652 |
container_title |
Polar Research |
container_volume |
14 |
container_issue |
1 |
container_start_page |
69 |
op_container_end_page |
82 |
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1766271074216968192 |