Dissolved Fe across the Weddell Sea and Drake Passage: impact of DFe on nutrient uptake
This manuscript reports the first full depth distributions of dissolved iron (DFe) over a high-resolution Weddell Sea and Drake Passage transect. Very low dissolved DFe concentrations (0.01-0.1 nM range) were observed in the surface waters of the Weddell Sea, and within the Drake Passage polar regim...
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Language: | English |
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2014
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ftnioz:oai:imis.nioz.nl:239898 2023-05-15T13:47:57+02:00 Dissolved Fe across the Weddell Sea and Drake Passage: impact of DFe on nutrient uptake Klunder, M.B. Laan, P. de Baar, H.J.W. Middag, R. Neven, I. Van Ooijen, J. 2014 application/pdf https://www.vliz.be/imisdocs/publications/81/260581.pdf en eng info:eu-repo/semantics/altIdentifier/wos/000334099700009 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.5194/bg-11-651-2014 https://www.vliz.be/imisdocs/publications/81/260581.pdf info:eu-repo/semantics/openAccess %3Ci%3EBiogeosciences+11%283%29%3C%2Fi%3E%3A+651-669.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.5194%2Fbg-11-651-2014%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.5194%2Fbg-11-651-2014%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2014 ftnioz https://doi.org/10.5194/bg-11-651-2014 2022-05-01T13:59:12Z This manuscript reports the first full depth distributions of dissolved iron (DFe) over a high-resolution Weddell Sea and Drake Passage transect. Very low dissolved DFe concentrations (0.01-0.1 nM range) were observed in the surface waters of the Weddell Sea, and within the Drake Passage polar regime. Locally, enrichment in surface DFe was observed, likely due to recent ice melt (Weddell Sea) or dust deposition (Drake Passage). As expected, in low DFe regions, usually a small silicate drawdown compared to the nitrate drawdown was observed. However, the difference in drawdown between these nutrients appeared not related to DFe availability in the western Weddell Sea. In this region with relatively small diatoms, no relationship between N: P and N: Si removal ratios and DFe was observed. In comparison, along the Greenwich Meridian (Klunder et al., 2011a), where diatoms are significantly larger, the N: P and N: Si removal ratios did increase with increasing DFe. These findings confirm the important role of DFe in biologically mediated nutrient cycles in the Southern Ocean and imply DFe availability might play a role in shaping phytoplankton communities and constraining cell sizes. Over the shelf around the Antarctic Peninsula, higher DFe concentrations (> 1.5 nM) were observed. These elevated concentrations of Fe were transported into Drake Passage along isopycnal surfaces. Near the South American continent, high (> 2 nM) DFe concentrations were caused by fluvial/ glacial input of DFe. On the Weddell Sea side of the Peninsula region, formation of deep water (by downslope convection) caused relatively high Fe (0.6-0.8 nM) concentrations in the bottom waters relative to the water masses at mid-depth (0.2-0.4 nM). During transit of Weddell Sea Bottom Water to the Drake Passage, through the Scotia Sea, additional DFe is taken up from seafloor sources, resulting in highest bottom water concentrations in the southernmost part of the Drake Passage in excess of 1 nM. TheWeddell Sea Deep Water concentrations (similar to 0.32 nM) were consistent with the lowest DFe concentrations observed in Antarctic bottom water in the Atlantic Ocean. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Drake Passage Scotia Sea Southern Ocean Weddell Sea NIOZ Repository (Royal Netherlands Institute for Sea Research) Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea Drake Passage Scotia Sea Weddell Greenwich Biogeosciences 11 3 651 669 |
institution |
Open Polar |
collection |
NIOZ Repository (Royal Netherlands Institute for Sea Research) |
op_collection_id |
ftnioz |
language |
English |
description |
This manuscript reports the first full depth distributions of dissolved iron (DFe) over a high-resolution Weddell Sea and Drake Passage transect. Very low dissolved DFe concentrations (0.01-0.1 nM range) were observed in the surface waters of the Weddell Sea, and within the Drake Passage polar regime. Locally, enrichment in surface DFe was observed, likely due to recent ice melt (Weddell Sea) or dust deposition (Drake Passage). As expected, in low DFe regions, usually a small silicate drawdown compared to the nitrate drawdown was observed. However, the difference in drawdown between these nutrients appeared not related to DFe availability in the western Weddell Sea. In this region with relatively small diatoms, no relationship between N: P and N: Si removal ratios and DFe was observed. In comparison, along the Greenwich Meridian (Klunder et al., 2011a), where diatoms are significantly larger, the N: P and N: Si removal ratios did increase with increasing DFe. These findings confirm the important role of DFe in biologically mediated nutrient cycles in the Southern Ocean and imply DFe availability might play a role in shaping phytoplankton communities and constraining cell sizes. Over the shelf around the Antarctic Peninsula, higher DFe concentrations (> 1.5 nM) were observed. These elevated concentrations of Fe were transported into Drake Passage along isopycnal surfaces. Near the South American continent, high (> 2 nM) DFe concentrations were caused by fluvial/ glacial input of DFe. On the Weddell Sea side of the Peninsula region, formation of deep water (by downslope convection) caused relatively high Fe (0.6-0.8 nM) concentrations in the bottom waters relative to the water masses at mid-depth (0.2-0.4 nM). During transit of Weddell Sea Bottom Water to the Drake Passage, through the Scotia Sea, additional DFe is taken up from seafloor sources, resulting in highest bottom water concentrations in the southernmost part of the Drake Passage in excess of 1 nM. TheWeddell Sea Deep Water concentrations (similar to 0.32 nM) were consistent with the lowest DFe concentrations observed in Antarctic bottom water in the Atlantic Ocean. |
format |
Article in Journal/Newspaper |
author |
Klunder, M.B. Laan, P. de Baar, H.J.W. Middag, R. Neven, I. Van Ooijen, J. |
spellingShingle |
Klunder, M.B. Laan, P. de Baar, H.J.W. Middag, R. Neven, I. Van Ooijen, J. Dissolved Fe across the Weddell Sea and Drake Passage: impact of DFe on nutrient uptake |
author_facet |
Klunder, M.B. Laan, P. de Baar, H.J.W. Middag, R. Neven, I. Van Ooijen, J. |
author_sort |
Klunder, M.B. |
title |
Dissolved Fe across the Weddell Sea and Drake Passage: impact of DFe on nutrient uptake |
title_short |
Dissolved Fe across the Weddell Sea and Drake Passage: impact of DFe on nutrient uptake |
title_full |
Dissolved Fe across the Weddell Sea and Drake Passage: impact of DFe on nutrient uptake |
title_fullStr |
Dissolved Fe across the Weddell Sea and Drake Passage: impact of DFe on nutrient uptake |
title_full_unstemmed |
Dissolved Fe across the Weddell Sea and Drake Passage: impact of DFe on nutrient uptake |
title_sort |
dissolved fe across the weddell sea and drake passage: impact of dfe on nutrient uptake |
publishDate |
2014 |
url |
https://www.vliz.be/imisdocs/publications/81/260581.pdf |
geographic |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea Drake Passage Scotia Sea Weddell Greenwich |
geographic_facet |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea Drake Passage Scotia Sea Weddell Greenwich |
genre |
Antarc* Antarctic Antarctic Peninsula Drake Passage Scotia Sea Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Drake Passage Scotia Sea Southern Ocean Weddell Sea |
op_source |
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op_relation |
info:eu-repo/semantics/altIdentifier/wos/000334099700009 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.5194/bg-11-651-2014 https://www.vliz.be/imisdocs/publications/81/260581.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-11-651-2014 |
container_title |
Biogeosciences |
container_volume |
11 |
container_issue |
3 |
container_start_page |
651 |
op_container_end_page |
669 |
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1766248040045215744 |