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| Beucher, Charlotte P.; Brzezinski, Mark A.; Crosta, Xavier. |
| The silicic acid leakage hypothesis (SALH) purports that changes in silicon and nitrogen depletion ratios in the glacial Antarctic created a large pool of unused silicic acid that was transported to lower latitudes in subantarctic mode water (SAMW) where it enhanced diatom productivity lowering atmospheric pCO(2). However, increased opal accumulation beneath the sub-Antarctic during glacial times implies significant consumption of silicic acid in subantarctic surface waters that may have significantly diminished or eliminated Si leakage. To test how nutrient dynamics in the sub-Antarctic affected the Si( OH) 4 content of SAMW during the last glacial period, we produced delta(30) Si opal records for cores from the subantarctic and subtropical zones of the... |
| Tipo: Text |
Palavras-chave: Silicon isotope; Silicic acid leakage; Indian sub-Antarctic. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00233/34462/32882.pdf |
