| Glacial silicic acid concentrations in the Southern Ocean. | |
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MedLine Citation:
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PMID: 20966217 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Reconstruction of nutrient concentrations in the deep Southern Ocean has produced conflicting results. The cadmium/calcium (Cd/Ca) data set suggests little change in nutrient concentrations during the last glacial period, whereas the carbon isotope data set suggests that nutrient concentrations were higher. We determined the silicon isotope composition of sponge spicules from the Atlantic and Pacific sectors of the Southern Ocean and found higher silicic acid concentrations in the Pacific sector during the last glacial period. We propose that this increase results from changes in the stoichiometric uptake of silicic acid relative to nitrate and phosphate by diatoms, thus facilitating a redistribution of nutrients across the Pacific and Southern Oceans. Our results are consistent with the global Cd/Ca data set and support the silicic acid leakage hypothesis. |
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Authors:
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Michael J Ellwood; Martin Wille; William Maher |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-10-21 |
Journal Detail:
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Title: Science (New York, N.Y.) Volume: 330 ISSN: 1095-9203 ISO Abbreviation: Science Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2010-11-24 Completed Date: 2010-12-14 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0404511 Medline TA: Science Country: United States |
Other Details:
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Languages: eng Pagination: 1088-91 Citation Subset: IM |
Affiliation:
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Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia. michael.ellwood@anu.edu.au |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Diatoms / chemistry Oceans and Seas Porifera / chemistry Silicic Acid / analysis* |
| Chemical | |
Reg. No./Substance:
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1343-98-2/Silicic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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