Estimates of late Quaternary mode and intermediate water SILICIC ACID (cas 1343-98-2) concentration in the Pacific Southern Ocean
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Add time:09/07/2019 Source:sciencedirect.com
The Southern Ocean plays a critical role in the exchange of carbon between the ocean and atmosphere over glacial–interglacial timescales. Hypotheses used to explain late Quaternary variations in atmospheric carbon dioxide (CO2) implicate changes in the nutrient dynamics and circulation of the Southern Ocean. Here we present silicon isotope (δ30Si) records of late Quaternary sponges and diatoms from the NZ-sector of the Southern Ocean. Analysis of our sponge δ30Si records strongly suggests that the SILICIC ACID (cas 1343-98-2) concentration at mode and intermediate depths was higher during the LGM and the deglacial period compared to the present day. Our diatom δ30Si record suggests biological productivity near of the Polar Front was greater during the deglacial period, but not significantly different during the LGM compared to the present day. Taking our dataset in context with other regional paleoceanographic records, we interpret the predicted elevation in LGM and deglacial silicic acid concentration to reflect a shoaling of water masses during the LGM and ‘leakage’ of excess Southern Ocean dissolved silicon during the deglacial period.
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