Glacial Silicic Acid Concentrations in the Southern Ocean
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...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
American Association for the Advancement of Science
2015
|
Subjects: | |
Online Access: | http://hdl.handle.net/1885/56354 |
id |
ftanucanberra:oai:digitalcollections.anu.edu.au:1885/56354 |
---|---|
record_format |
openpolar |
spelling |
ftanucanberra:oai:digitalcollections.anu.edu.au:1885/56354 2023-05-15T18:24:16+02:00 Glacial Silicic Acid Concentrations in the Southern Ocean Ellwood, Michael Wille, Martin Maher, William 2015-12-10T22:35:39Z http://hdl.handle.net/1885/56354 unknown American Association for the Advancement of Science 0036-8075 http://hdl.handle.net/1885/56354 Science Journal article 2015 ftanucanberra 2015-12-28T23:29:28Z 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. Article in Journal/Newspaper Southern Ocean Australian National University: ANU Digital Collections Pacific Southern Ocean |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
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 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. |
format |
Article in Journal/Newspaper |
author |
Ellwood, Michael Wille, Martin Maher, William |
spellingShingle |
Ellwood, Michael Wille, Martin Maher, William Glacial Silicic Acid Concentrations in the Southern Ocean |
author_facet |
Ellwood, Michael Wille, Martin Maher, William |
author_sort |
Ellwood, Michael |
title |
Glacial Silicic Acid Concentrations in the Southern Ocean |
title_short |
Glacial Silicic Acid Concentrations in the Southern Ocean |
title_full |
Glacial Silicic Acid Concentrations in the Southern Ocean |
title_fullStr |
Glacial Silicic Acid Concentrations in the Southern Ocean |
title_full_unstemmed |
Glacial Silicic Acid Concentrations in the Southern Ocean |
title_sort |
glacial silicic acid concentrations in the southern ocean |
publisher |
American Association for the Advancement of Science |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/56354 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Science |
op_relation |
0036-8075 http://hdl.handle.net/1885/56354 |
_version_ |
1766204669859725312 |