The role of sea ice formation in cycling of aluminium in northern Marguerite Bay, Antarctica
The use of dissolved Al as a tracer for oceanic water masses and atmospheric dust deposition of biologically important elements, such as iron, requires the quantitative assessment of its sources and sinks in seawater. Here, we address the relative importance of oceanic versus atmospheric inputs of A...
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Online Access: | https://doi.org/10.1016/j.ecss.2009.12.017 https://ora.ox.ac.uk/objects/uuid:d5a80b27-5b61-4385-8ffe-4c0eda0804c1 |
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ftuloxford:oai:ora.ox.ac.uk:uuid:d5a80b27-5b61-4385-8ffe-4c0eda0804c1 2023-05-15T13:44:38+02:00 The role of sea ice formation in cycling of aluminium in northern Marguerite Bay, Antarctica Hendry, K Meredith, MR Measures, C Carson, D Rickaby, R 2016-07-29 https://doi.org/10.1016/j.ecss.2009.12.017 https://ora.ox.ac.uk/objects/uuid:d5a80b27-5b61-4385-8ffe-4c0eda0804c1 eng eng doi:10.1016/j.ecss.2009.12.017 https://ora.ox.ac.uk/objects/uuid:d5a80b27-5b61-4385-8ffe-4c0eda0804c1 https://doi.org/10.1016/j.ecss.2009.12.017 info:eu-repo/semantics/embargoedAccess Journal article 2016 ftuloxford https://doi.org/10.1016/j.ecss.2009.12.017 2022-06-28T20:24:59Z The use of dissolved Al as a tracer for oceanic water masses and atmospheric dust deposition of biologically important elements, such as iron, requires the quantitative assessment of its sources and sinks in seawater. Here, we address the relative importance of oceanic versus atmospheric inputs of Al, and the relationship with nutrient cycling, in a region of high biological productivity in coastal Antarctica. We investigate the concentrations of dissolved Al in seawater, sea ice, meteoric water and sediments collected from northern Marguerite Bay, off the West Antarctic Peninsula, from 2005 to 2006. Dissolved Al concentrations at 15 m water depth varied between 2 and 27 nM, showing a peak between two phytoplankton blooms. We find that, in this coastal setting, upwelling and incorporation of waters from below the surface mixed layer are responsible for this peak in dissolved Al as well as renewal of nutrients. This means that changes in the intensity and frequency of upwelling events may result in changes in biological production and carbon uptake. The waters below the mixed layer are most likely enriched in Al as a result of sea ice formation, either causing the injection of Al-rich brines or the resuspension of sediments and entrainment of pore fluids by brine cascades. Glacial, snow and sea ice melt contribute secondarily to the supply of Al to surface waters. Total particulate Al ranges from 93 to 2057 mg/g, and increases with meteoric water input towards the end of the summer, indicating glacial runoff is an important source of particulate Al. The (Al/Si)opal of sediment core top material is considerably higher than water column opal collected by sediment traps, indicative of a diagenetic overprint and incorporation of Al at the sediment-water interface. Opal that remains buried in the sediment could represent a significant sink of Al from seawater. © 2009 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice ORA - Oxford University Research Archive Antarctic Antarctic Peninsula Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) Estuarine, Coastal and Shelf Science 87 1 103 112 |
institution |
Open Polar |
collection |
ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
English |
description |
The use of dissolved Al as a tracer for oceanic water masses and atmospheric dust deposition of biologically important elements, such as iron, requires the quantitative assessment of its sources and sinks in seawater. Here, we address the relative importance of oceanic versus atmospheric inputs of Al, and the relationship with nutrient cycling, in a region of high biological productivity in coastal Antarctica. We investigate the concentrations of dissolved Al in seawater, sea ice, meteoric water and sediments collected from northern Marguerite Bay, off the West Antarctic Peninsula, from 2005 to 2006. Dissolved Al concentrations at 15 m water depth varied between 2 and 27 nM, showing a peak between two phytoplankton blooms. We find that, in this coastal setting, upwelling and incorporation of waters from below the surface mixed layer are responsible for this peak in dissolved Al as well as renewal of nutrients. This means that changes in the intensity and frequency of upwelling events may result in changes in biological production and carbon uptake. The waters below the mixed layer are most likely enriched in Al as a result of sea ice formation, either causing the injection of Al-rich brines or the resuspension of sediments and entrainment of pore fluids by brine cascades. Glacial, snow and sea ice melt contribute secondarily to the supply of Al to surface waters. Total particulate Al ranges from 93 to 2057 mg/g, and increases with meteoric water input towards the end of the summer, indicating glacial runoff is an important source of particulate Al. The (Al/Si)opal of sediment core top material is considerably higher than water column opal collected by sediment traps, indicative of a diagenetic overprint and incorporation of Al at the sediment-water interface. Opal that remains buried in the sediment could represent a significant sink of Al from seawater. © 2009 Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Hendry, K Meredith, MR Measures, C Carson, D Rickaby, R |
spellingShingle |
Hendry, K Meredith, MR Measures, C Carson, D Rickaby, R The role of sea ice formation in cycling of aluminium in northern Marguerite Bay, Antarctica |
author_facet |
Hendry, K Meredith, MR Measures, C Carson, D Rickaby, R |
author_sort |
Hendry, K |
title |
The role of sea ice formation in cycling of aluminium in northern Marguerite Bay, Antarctica |
title_short |
The role of sea ice formation in cycling of aluminium in northern Marguerite Bay, Antarctica |
title_full |
The role of sea ice formation in cycling of aluminium in northern Marguerite Bay, Antarctica |
title_fullStr |
The role of sea ice formation in cycling of aluminium in northern Marguerite Bay, Antarctica |
title_full_unstemmed |
The role of sea ice formation in cycling of aluminium in northern Marguerite Bay, Antarctica |
title_sort |
role of sea ice formation in cycling of aluminium in northern marguerite bay, antarctica |
publishDate |
2016 |
url |
https://doi.org/10.1016/j.ecss.2009.12.017 https://ora.ox.ac.uk/objects/uuid:d5a80b27-5b61-4385-8ffe-4c0eda0804c1 |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) |
geographic |
Antarctic Antarctic Peninsula Marguerite Marguerite Bay |
geographic_facet |
Antarctic Antarctic Peninsula Marguerite Marguerite Bay |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice |
op_relation |
doi:10.1016/j.ecss.2009.12.017 https://ora.ox.ac.uk/objects/uuid:d5a80b27-5b61-4385-8ffe-4c0eda0804c1 https://doi.org/10.1016/j.ecss.2009.12.017 |
op_rights |
info:eu-repo/semantics/embargoedAccess |
op_doi |
https://doi.org/10.1016/j.ecss.2009.12.017 |
container_title |
Estuarine, Coastal and Shelf Science |
container_volume |
87 |
container_issue |
1 |
container_start_page |
103 |
op_container_end_page |
112 |
_version_ |
1766204219694514176 |