Document Detail

Glacial silicic acid concentrations in the Southern Ocean.
MedLine Citation:
PMID:  20966217     Owner:  NLM     Status:  MEDLINE    
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.
Michael J Ellwood; Martin Wille; William Maher
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-10-21
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  330     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-24     Completed Date:  2010-12-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1088-91     Citation Subset:  IM    
Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia.
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MeSH Terms
Diatoms / chemistry
Oceans and Seas
Porifera / chemistry
Silicic Acid / analysis*
Reg. No./Substance:
1343-98-2/Silicic Acid

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