Natural iron enrichment around the Antarctic Peninsula in the Southern Ocean
As part of the US-AMLR program in January-February of 2006, 99 stations in the South Shetland Islands-Antarctic Peninsula region were sampled to understand the variability in hydrographic and biological properties related to the abundance and distribution of krill in this area. Concentrations of dis...
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ftdoajarticles:oai:doaj.org/article:540128d517fb4c9fa997d7bf77aa9722 2023-05-15T14:00:50+02:00 Natural iron enrichment around the Antarctic Peninsula in the Southern Ocean M. V. Ardelan O. Holm-Hansen C. D. Hewes C. S. Reiss N. S. Silva H. Dulaiova E. Steinnes E. Sakshaug 2010-01-01T00:00:00Z https://doi.org/10.5194/bg-7-11-2010 https://doaj.org/article/540128d517fb4c9fa997d7bf77aa9722 EN eng Copernicus Publications http://www.biogeosciences.net/7/11/2010/bg-7-11-2010.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-7-11-2010 https://doaj.org/article/540128d517fb4c9fa997d7bf77aa9722 Biogeosciences, Vol 7, Iss 1, Pp 11-25 (2010) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2010 ftdoajarticles https://doi.org/10.5194/bg-7-11-2010 2022-12-31T14:05:56Z As part of the US-AMLR program in January-February of 2006, 99 stations in the South Shetland Islands-Antarctic Peninsula region were sampled to understand the variability in hydrographic and biological properties related to the abundance and distribution of krill in this area. Concentrations of dissolved iron (DFe) and total acid-leachable iron (TaLFe) were measured in the upper 150 m at 16 of these stations (both coastal and pelagic waters) to better resolve the factors limiting primary production in this area and in downstream waters of the Scotia Sea. The concentrations of DFe and TaLFe in the upper mixed layer (UML) were relatively high in Weddell Sea Shelf Waters (~0.6 nM and 15 nM, respectively) and low in Drake Passage waters (~0.2 nM and 0.9 nM, respectively). In the Bransfield Strait, representing a mixture of waters from the Weddell Sea and the Antarctic Circumpolar Current (ACC), concentrations of DFe were ~0.4 nM and of TaLFe ~1.7 nM. The highest concentrations of DFe and TaLFe in the UML were found at shallow coastal stations close to Livingston Island (~1.6 nM and 100 nM, respectively). The ratio of TaLFe:DFe varied with the distance to land: ~45 at the shallow coastal stations, ~15 in the high-salinity waters of Bransfield Strait, and ~4 in ACC waters. Concentrations of DFe increased slightly with depth in the water column, while that of TaLFe did not show any consistent trend with depth. Our Fe data are discussed in regard to the hydrography and water circulation patterns in the study area, and with the hypothesis that the relatively high rates of primary production in the central regions of the Scotia Sea are partially sustained by natural iron enrichment resulting from a northeasterly flow of iron-rich coastal waters originating in the South Shetland Islands-Antarctic Peninsula region. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Livingston Island Scotia Sea South Shetland Islands Southern Ocean Weddell Sea Directory of Open Access Journals: DOAJ Articles Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) Scotia Sea South Shetland Islands Southern Ocean The Antarctic Weddell Weddell Sea Biogeosciences 7 1 11 25 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 M. V. Ardelan O. Holm-Hansen C. D. Hewes C. S. Reiss N. S. Silva H. Dulaiova E. Steinnes E. Sakshaug Natural iron enrichment around the Antarctic Peninsula in the Southern Ocean |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
As part of the US-AMLR program in January-February of 2006, 99 stations in the South Shetland Islands-Antarctic Peninsula region were sampled to understand the variability in hydrographic and biological properties related to the abundance and distribution of krill in this area. Concentrations of dissolved iron (DFe) and total acid-leachable iron (TaLFe) were measured in the upper 150 m at 16 of these stations (both coastal and pelagic waters) to better resolve the factors limiting primary production in this area and in downstream waters of the Scotia Sea. The concentrations of DFe and TaLFe in the upper mixed layer (UML) were relatively high in Weddell Sea Shelf Waters (~0.6 nM and 15 nM, respectively) and low in Drake Passage waters (~0.2 nM and 0.9 nM, respectively). In the Bransfield Strait, representing a mixture of waters from the Weddell Sea and the Antarctic Circumpolar Current (ACC), concentrations of DFe were ~0.4 nM and of TaLFe ~1.7 nM. The highest concentrations of DFe and TaLFe in the UML were found at shallow coastal stations close to Livingston Island (~1.6 nM and 100 nM, respectively). The ratio of TaLFe:DFe varied with the distance to land: ~45 at the shallow coastal stations, ~15 in the high-salinity waters of Bransfield Strait, and ~4 in ACC waters. Concentrations of DFe increased slightly with depth in the water column, while that of TaLFe did not show any consistent trend with depth. Our Fe data are discussed in regard to the hydrography and water circulation patterns in the study area, and with the hypothesis that the relatively high rates of primary production in the central regions of the Scotia Sea are partially sustained by natural iron enrichment resulting from a northeasterly flow of iron-rich coastal waters originating in the South Shetland Islands-Antarctic Peninsula region. |
format |
Article in Journal/Newspaper |
author |
M. V. Ardelan O. Holm-Hansen C. D. Hewes C. S. Reiss N. S. Silva H. Dulaiova E. Steinnes E. Sakshaug |
author_facet |
M. V. Ardelan O. Holm-Hansen C. D. Hewes C. S. Reiss N. S. Silva H. Dulaiova E. Steinnes E. Sakshaug |
author_sort |
M. V. Ardelan |
title |
Natural iron enrichment around the Antarctic Peninsula in the Southern Ocean |
title_short |
Natural iron enrichment around the Antarctic Peninsula in the Southern Ocean |
title_full |
Natural iron enrichment around the Antarctic Peninsula in the Southern Ocean |
title_fullStr |
Natural iron enrichment around the Antarctic Peninsula in the Southern Ocean |
title_full_unstemmed |
Natural iron enrichment around the Antarctic Peninsula in the Southern Ocean |
title_sort |
natural iron enrichment around the antarctic peninsula in the southern ocean |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doi.org/10.5194/bg-7-11-2010 https://doaj.org/article/540128d517fb4c9fa997d7bf77aa9722 |
long_lat |
ENVELOPE(-60.500,-60.500,-62.600,-62.600) |
geographic |
Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Livingston Island Scotia Sea South Shetland Islands Southern Ocean The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Livingston Island Scotia Sea South Shetland Islands Southern Ocean The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Livingston Island Scotia Sea South Shetland Islands Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Livingston Island Scotia Sea South Shetland Islands Southern Ocean Weddell Sea |
op_source |
Biogeosciences, Vol 7, Iss 1, Pp 11-25 (2010) |
op_relation |
http://www.biogeosciences.net/7/11/2010/bg-7-11-2010.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-7-11-2010 https://doaj.org/article/540128d517fb4c9fa997d7bf77aa9722 |
op_doi |
https://doi.org/10.5194/bg-7-11-2010 |
container_title |
Biogeosciences |
container_volume |
7 |
container_issue |
1 |
container_start_page |
11 |
op_container_end_page |
25 |
_version_ |
1766270185301344256 |