Regulation of algal blooms in Antarctic shelf waters by the release of iron from melting sea ice
During summer 1995-96, we measured iron in the water column and conducted iron-enrichment bottle-incubation experiments at a station in the central Ross Sea (7630S, 17040W), first, in the presence of melting sea ice, and 17 days later, in ice-free conditions. We observed a striking temporal change i...
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American Geophysical Union
1997
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Online Access: | https://doi.org/10.1029/97GL02596 http://ecite.utas.edu.au/12658 |
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ftunivtasecite:oai:ecite.utas.edu.au:12658 2023-05-15T13:56:40+02:00 Regulation of algal blooms in Antarctic shelf waters by the release of iron from melting sea ice Sedwick, PN DiTullio, GR 1997 https://doi.org/10.1029/97GL02596 http://ecite.utas.edu.au/12658 en eng American Geophysical Union http://dx.doi.org/10.1029/97GL02596 Sedwick, PN and DiTullio, GR, Regulation of algal blooms in Antarctic shelf waters by the release of iron from melting sea ice, Geophysical Research Letters, 24, (20) pp. 2515-2518. ISSN 0094-8276 (1997) [Refereed Article] http://ecite.utas.edu.au/12658 Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Refereed Article PeerReviewed 1997 ftunivtasecite https://doi.org/10.1029/97GL02596 2019-12-13T20:57:27Z During summer 1995-96, we measured iron in the water column and conducted iron-enrichment bottle-incubation experiments at a station in the central Ross Sea (7630S, 17040W), first, in the presence of melting sea ice, and 17 days later, in ice-free conditions. We observed a striking temporal change in mixed-layer dissolved iron concentrations at this station, from 0.72-2.3 nM with sea ice present, to 0.16-0.17 nM in ice-free conditions. These changes were accompanied by a significant drawdown in macronutrients and an approximate doubling of algal (diatom) biomass. Our incubation experiments suggest that conditions were ironreplete in the presence of sea ice, and iron-deficient in the absence of sea ice. We surmise that bioavailable iron was released into seawater from the melting sea ice, stimulating phytoplankton production and the biological removal of dissolved iron from the mixed layer, until iron-limited conditions developed. These observations suggest that the episodic release of bioavailable iron from melting sea ice is an important factor regulating phytoplankton production, particularly ice-edge blooms, in seasonally ice-covered Antarctic waters. Copyright 1997 by the American Geophysical Union. Article in Journal/Newspaper Antarc* Antarctic Ross Sea Sea ice eCite UTAS (University of Tasmania) Antarctic Ross Sea Geophysical Research Letters 24 20 2515 2518 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
spellingShingle |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Sedwick, PN DiTullio, GR Regulation of algal blooms in Antarctic shelf waters by the release of iron from melting sea ice |
topic_facet |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
description |
During summer 1995-96, we measured iron in the water column and conducted iron-enrichment bottle-incubation experiments at a station in the central Ross Sea (7630S, 17040W), first, in the presence of melting sea ice, and 17 days later, in ice-free conditions. We observed a striking temporal change in mixed-layer dissolved iron concentrations at this station, from 0.72-2.3 nM with sea ice present, to 0.16-0.17 nM in ice-free conditions. These changes were accompanied by a significant drawdown in macronutrients and an approximate doubling of algal (diatom) biomass. Our incubation experiments suggest that conditions were ironreplete in the presence of sea ice, and iron-deficient in the absence of sea ice. We surmise that bioavailable iron was released into seawater from the melting sea ice, stimulating phytoplankton production and the biological removal of dissolved iron from the mixed layer, until iron-limited conditions developed. These observations suggest that the episodic release of bioavailable iron from melting sea ice is an important factor regulating phytoplankton production, particularly ice-edge blooms, in seasonally ice-covered Antarctic waters. Copyright 1997 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Sedwick, PN DiTullio, GR |
author_facet |
Sedwick, PN DiTullio, GR |
author_sort |
Sedwick, PN |
title |
Regulation of algal blooms in Antarctic shelf waters by the release of iron from melting sea ice |
title_short |
Regulation of algal blooms in Antarctic shelf waters by the release of iron from melting sea ice |
title_full |
Regulation of algal blooms in Antarctic shelf waters by the release of iron from melting sea ice |
title_fullStr |
Regulation of algal blooms in Antarctic shelf waters by the release of iron from melting sea ice |
title_full_unstemmed |
Regulation of algal blooms in Antarctic shelf waters by the release of iron from melting sea ice |
title_sort |
regulation of algal blooms in antarctic shelf waters by the release of iron from melting sea ice |
publisher |
American Geophysical Union |
publishDate |
1997 |
url |
https://doi.org/10.1029/97GL02596 http://ecite.utas.edu.au/12658 |
geographic |
Antarctic Ross Sea |
geographic_facet |
Antarctic Ross Sea |
genre |
Antarc* Antarctic Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Ross Sea Sea ice |
op_relation |
http://dx.doi.org/10.1029/97GL02596 Sedwick, PN and DiTullio, GR, Regulation of algal blooms in Antarctic shelf waters by the release of iron from melting sea ice, Geophysical Research Letters, 24, (20) pp. 2515-2518. ISSN 0094-8276 (1997) [Refereed Article] http://ecite.utas.edu.au/12658 |
op_doi |
https://doi.org/10.1029/97GL02596 |
container_title |
Geophysical Research Letters |
container_volume |
24 |
container_issue |
20 |
container_start_page |
2515 |
op_container_end_page |
2518 |
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1766264229071945728 |