Glacial-interglacial size variability in the diatom Fragilariopsis kerguelensis: Possible iron/dust controls?
The valve area of Fragilariopsis kerguelensis, the most abundant diatom species in the Southern Ocean, strongly changes in size in response to varying conditions in the surface ocean. We examined the link, both in two iron fertilization experiments and in sediment samples covering several glacial Te...
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Online Access: | https://epic.awi.de/id/eprint/30246/ https://epic.awi.de/id/eprint/30246/1/Corteseetal2012_Fkerg.pdf https://hdl.handle.net/10013/epic.39174 https://hdl.handle.net/10013/epic.39174.d001 |
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ftawi:oai:epic.awi.de:30246 2023-05-15T13:46:52+02:00 Glacial-interglacial size variability in the diatom Fragilariopsis kerguelensis: Possible iron/dust controls? Cortese, Giuseppe Gersonde, Rainer Maschner, K. Medley, P. 2012 application/pdf https://epic.awi.de/id/eprint/30246/ https://epic.awi.de/id/eprint/30246/1/Corteseetal2012_Fkerg.pdf https://hdl.handle.net/10013/epic.39174 https://hdl.handle.net/10013/epic.39174.d001 unknown AMER GEOPHYSICAL UNION https://epic.awi.de/id/eprint/30246/1/Corteseetal2012_Fkerg.pdf https://hdl.handle.net/10013/epic.39174.d001 Cortese, G. , Gersonde, R. , Maschner, K. and Medley, P. (2012) Glacial-interglacial size variability in the diatom Fragilariopsis kerguelensis: Possible iron/dust controls? , Paleoceanography, 27 , PA1208 . doi:10.1029/2011PA002187 <https://doi.org/10.1029/2011PA002187> , hdl:10013/epic.39174 EPIC3Paleoceanography, AMER GEOPHYSICAL UNION, 27, pp. PA1208, ISSN: 0883-8305 Article isiRev 2012 ftawi 2021-12-24T15:37:38Z The valve area of Fragilariopsis kerguelensis, the most abundant diatom species in the Southern Ocean, strongly changes in size in response to varying conditions in the surface ocean. We examined the link, both in two iron fertilization experiments and in sediment samples covering several glacial Terminations, between size variability in this species and environmental conditions across the Antarctic Polar Front, including sea ice extent, sea surface temperature, and the input of eolian dust. The iron fertilization experiments show valve area to be positively correlated with iron concentrations in ambient waters, which suggests the possibility of a causal relation between valve size of Fragilariopsis kerguelensis and ambient surface water iron concentration. Larger valves are usually found during glacial times and thus seem to be related to lower sea surface temperature and wider sea ice coverage. Moreover, our results indicate that there usually is a strong correlation between larger valve size and increased input of eolian dust to the Southern Ocean. However, this correlation, obvious for the fertilization experiments and for glacial Terminations I, II, III, and V, does not seem to be valid for Termination VI, where size appears to be inversely correlated to dust input. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Southern Ocean The Antarctic Paleoceanography 27 1 n/a n/a |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The valve area of Fragilariopsis kerguelensis, the most abundant diatom species in the Southern Ocean, strongly changes in size in response to varying conditions in the surface ocean. We examined the link, both in two iron fertilization experiments and in sediment samples covering several glacial Terminations, between size variability in this species and environmental conditions across the Antarctic Polar Front, including sea ice extent, sea surface temperature, and the input of eolian dust. The iron fertilization experiments show valve area to be positively correlated with iron concentrations in ambient waters, which suggests the possibility of a causal relation between valve size of Fragilariopsis kerguelensis and ambient surface water iron concentration. Larger valves are usually found during glacial times and thus seem to be related to lower sea surface temperature and wider sea ice coverage. Moreover, our results indicate that there usually is a strong correlation between larger valve size and increased input of eolian dust to the Southern Ocean. However, this correlation, obvious for the fertilization experiments and for glacial Terminations I, II, III, and V, does not seem to be valid for Termination VI, where size appears to be inversely correlated to dust input. |
format |
Article in Journal/Newspaper |
author |
Cortese, Giuseppe Gersonde, Rainer Maschner, K. Medley, P. |
spellingShingle |
Cortese, Giuseppe Gersonde, Rainer Maschner, K. Medley, P. Glacial-interglacial size variability in the diatom Fragilariopsis kerguelensis: Possible iron/dust controls? |
author_facet |
Cortese, Giuseppe Gersonde, Rainer Maschner, K. Medley, P. |
author_sort |
Cortese, Giuseppe |
title |
Glacial-interglacial size variability in the diatom Fragilariopsis kerguelensis: Possible iron/dust controls? |
title_short |
Glacial-interglacial size variability in the diatom Fragilariopsis kerguelensis: Possible iron/dust controls? |
title_full |
Glacial-interglacial size variability in the diatom Fragilariopsis kerguelensis: Possible iron/dust controls? |
title_fullStr |
Glacial-interglacial size variability in the diatom Fragilariopsis kerguelensis: Possible iron/dust controls? |
title_full_unstemmed |
Glacial-interglacial size variability in the diatom Fragilariopsis kerguelensis: Possible iron/dust controls? |
title_sort |
glacial-interglacial size variability in the diatom fragilariopsis kerguelensis: possible iron/dust controls? |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2012 |
url |
https://epic.awi.de/id/eprint/30246/ https://epic.awi.de/id/eprint/30246/1/Corteseetal2012_Fkerg.pdf https://hdl.handle.net/10013/epic.39174 https://hdl.handle.net/10013/epic.39174.d001 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_source |
EPIC3Paleoceanography, AMER GEOPHYSICAL UNION, 27, pp. PA1208, ISSN: 0883-8305 |
op_relation |
https://epic.awi.de/id/eprint/30246/1/Corteseetal2012_Fkerg.pdf https://hdl.handle.net/10013/epic.39174.d001 Cortese, G. , Gersonde, R. , Maschner, K. and Medley, P. (2012) Glacial-interglacial size variability in the diatom Fragilariopsis kerguelensis: Possible iron/dust controls? , Paleoceanography, 27 , PA1208 . doi:10.1029/2011PA002187 <https://doi.org/10.1029/2011PA002187> , hdl:10013/epic.39174 |
container_title |
Paleoceanography |
container_volume |
27 |
container_issue |
1 |
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n/a |
op_container_end_page |
n/a |
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1766245457227415552 |