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| Main Authors: | , , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2010
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| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.771607 |
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| _version_ | 1867168558786543616 |
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| author | Ellwood, Michael J Wille, Martin Maher, William |
| author_facet | Ellwood, Michael J Wille, Martin Maher, William |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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 | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_771607 |
| institution | PANGAEA |
| language | en |
| publishDate | 2010 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Silicon isotope ratios of ODP Site 177-1089 and sediment core E33-22 Ellwood, Michael J Wille, Martin Maher, William 177-1089; COMPCORE; Composite Core; DRILL; Drilling/drill rig; E33-22; Joides Resolution; Leg177; Ocean Drilling Program; ODP; South Atlantic Ocean; South Pacific 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 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. |
| title | Silicon isotope ratios of ODP Site 177-1089 and sediment core E33-22 |
| topic | 177-1089; COMPCORE; Composite Core; DRILL; Drilling/drill rig; E33-22; Joides Resolution; Leg177; Ocean Drilling Program; ODP; South Atlantic Ocean; South Pacific Ocean |
| url | https://doi.org/10.1594/PANGAEA.771607 |