Origin and composition of settling iron aggregates in oligotrophic Sombre Lake, Signy Island, Antarctica
Sediment traps were deployed in an oligotrophic, seasonally anoxic maritime Antarctic lake for 15 months. Immediately after the onset of the inflow in spring many iron oxyhydroxide aggregates were collected in the traps. Image analysis, scanning electron microscopy and energy dispersive X-ray analys...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/514942/ https://doi.org/10.1007/BF00024206 |
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ftnerc:oai:nora.nerc.ac.uk:514942 2023-05-15T13:49:33+02:00 Origin and composition of settling iron aggregates in oligotrophic Sombre Lake, Signy Island, Antarctica Caulkett, A. P. Ellis-Evans, J. C. 1996-09 http://nora.nerc.ac.uk/id/eprint/514942/ https://doi.org/10.1007/BF00024206 unknown Springer Caulkett, A. P.; Ellis-Evans, J. C. 1996 Origin and composition of settling iron aggregates in oligotrophic Sombre Lake, Signy Island, Antarctica. Hydrobiologia, 330 (3). 177-187. https://doi.org/10.1007/BF00024206 <https://doi.org/10.1007/BF00024206> Publication - Article PeerReviewed 1996 ftnerc https://doi.org/10.1007/BF00024206 2023-02-04T19:43:48Z Sediment traps were deployed in an oligotrophic, seasonally anoxic maritime Antarctic lake for 15 months. Immediately after the onset of the inflow in spring many iron oxyhydroxide aggregates were collected in the traps. Image analysis, scanning electron microscopy and energy dispersive X-ray analysis were used to examine the aggregates. The aggregates consisted of primary particles that persisted in the aggregates. The mean diameter of the aggregates was constant with depth. The aggregates consisted predominantly of iron, phosphorus and oxygen but calcium was also an important constituent. Significant concentrations of manganese and sodium were also detected. The molar ratio Fe:P remained constant at 4:1 as did the ratio Fe:Ca at 52:1. The concentration of iron, phosphorus and calcium in the aggregates increased with depth, whilst the concentration of manganese decreased with depth in parallel with a gradient of increasing anoxia. The stable water column formed under ice cover and the temporal and spatial data provide evidence that the Fe:P and Fe:Ca ratios are constant and characteristic of the aggregates, whilst the overall composition of the aggregates is more dynamic and dependant on redox conditions and water chemistry. Article in Journal/Newspaper Antarc* Antarctic Antarctica Signy Island Natural Environment Research Council: NERC Open Research Archive Antarctic Signy Island ENVELOPE(-45.595,-45.595,-60.708,-60.708) Sombre Lake ENVELOPE(-45.615,-45.615,-60.687,-60.687) Hydrobiologia 330 3 177 187 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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unknown |
description |
Sediment traps were deployed in an oligotrophic, seasonally anoxic maritime Antarctic lake for 15 months. Immediately after the onset of the inflow in spring many iron oxyhydroxide aggregates were collected in the traps. Image analysis, scanning electron microscopy and energy dispersive X-ray analysis were used to examine the aggregates. The aggregates consisted of primary particles that persisted in the aggregates. The mean diameter of the aggregates was constant with depth. The aggregates consisted predominantly of iron, phosphorus and oxygen but calcium was also an important constituent. Significant concentrations of manganese and sodium were also detected. The molar ratio Fe:P remained constant at 4:1 as did the ratio Fe:Ca at 52:1. The concentration of iron, phosphorus and calcium in the aggregates increased with depth, whilst the concentration of manganese decreased with depth in parallel with a gradient of increasing anoxia. The stable water column formed under ice cover and the temporal and spatial data provide evidence that the Fe:P and Fe:Ca ratios are constant and characteristic of the aggregates, whilst the overall composition of the aggregates is more dynamic and dependant on redox conditions and water chemistry. |
format |
Article in Journal/Newspaper |
author |
Caulkett, A. P. Ellis-Evans, J. C. |
spellingShingle |
Caulkett, A. P. Ellis-Evans, J. C. Origin and composition of settling iron aggregates in oligotrophic Sombre Lake, Signy Island, Antarctica |
author_facet |
Caulkett, A. P. Ellis-Evans, J. C. |
author_sort |
Caulkett, A. P. |
title |
Origin and composition of settling iron aggregates in oligotrophic Sombre Lake, Signy Island, Antarctica |
title_short |
Origin and composition of settling iron aggregates in oligotrophic Sombre Lake, Signy Island, Antarctica |
title_full |
Origin and composition of settling iron aggregates in oligotrophic Sombre Lake, Signy Island, Antarctica |
title_fullStr |
Origin and composition of settling iron aggregates in oligotrophic Sombre Lake, Signy Island, Antarctica |
title_full_unstemmed |
Origin and composition of settling iron aggregates in oligotrophic Sombre Lake, Signy Island, Antarctica |
title_sort |
origin and composition of settling iron aggregates in oligotrophic sombre lake, signy island, antarctica |
publisher |
Springer |
publishDate |
1996 |
url |
http://nora.nerc.ac.uk/id/eprint/514942/ https://doi.org/10.1007/BF00024206 |
long_lat |
ENVELOPE(-45.595,-45.595,-60.708,-60.708) ENVELOPE(-45.615,-45.615,-60.687,-60.687) |
geographic |
Antarctic Signy Island Sombre Lake |
geographic_facet |
Antarctic Signy Island Sombre Lake |
genre |
Antarc* Antarctic Antarctica Signy Island |
genre_facet |
Antarc* Antarctic Antarctica Signy Island |
op_relation |
Caulkett, A. P.; Ellis-Evans, J. C. 1996 Origin and composition of settling iron aggregates in oligotrophic Sombre Lake, Signy Island, Antarctica. Hydrobiologia, 330 (3). 177-187. https://doi.org/10.1007/BF00024206 <https://doi.org/10.1007/BF00024206> |
op_doi |
https://doi.org/10.1007/BF00024206 |
container_title |
Hydrobiologia |
container_volume |
330 |
container_issue |
3 |
container_start_page |
177 |
op_container_end_page |
187 |
_version_ |
1766251577037815808 |