Glacial Silicic Acid Concentrations in the Southern Ocean
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Ellwood, Michael; Wille, Martin; Maher, William
Description
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...[Show more]
dc.contributor.author | Ellwood, Michael | |
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dc.contributor.author | Wille, Martin | |
dc.contributor.author | Maher, William | |
dc.date.accessioned | 2015-12-10T22:35:39Z | |
dc.identifier.issn | 0036-8075 | |
dc.identifier.uri | http://hdl.handle.net/1885/56354 | |
dc.description.abstract | 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. | |
dc.publisher | American Association for the Advancement of Science | |
dc.source | Science | |
dc.subject | Keywords: silicic acid; cadmium; calcium; carbon isotope; concentration (composition); data set; deep sea; diatom; isotopic composition; Last Glacial; nutrient cycling; organic acid; paleoceanography; paleoenvironment; phosphate; sponge; stoichiometry; article; con | |
dc.title | Glacial Silicic Acid Concentrations in the Southern Ocean | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 330 | |
dc.date.issued | 2010 | |
local.identifier.absfor | 040305 - Marine Geoscience | |
local.identifier.absfor | 040502 - Chemical Oceanography | |
local.identifier.ariespublication | f2965xPUB360 | |
local.type.status | Published Version | |
local.contributor.affiliation | Ellwood, Michael, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Wille, Martin, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Maher, William, University of Canberra | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.issue | 6007 | |
local.bibliographicCitation.startpage | 1088 | |
local.bibliographicCitation.lastpage | 1091 | |
local.identifier.doi | 10.1126/science.1194614 | |
local.identifier.absseo | 961104 - Physical and Chemical Conditions of Water in Marine Environments | |
dc.date.updated | 2016-02-24T08:27:46Z | |
local.identifier.scopusID | 2-s2.0-78449296905 | |
local.identifier.thomsonID | 000284374700039 | |
Collections | ANU Research Publications |
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01_Ellwood_Glacial_Silicic_Acid_2010.pdf | 1.09 MB | Adobe PDF | Request a copy | |
02_Ellwood_Glacial_Silicic_Acid_2010.pdf | 63.97 kB | Adobe PDF | Request a copy |
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