Silicon-isotope composition of diatoms as an indicator of past oceanic change
Article Abstract:
Silicon is necessary for diatom growth. Diatoms account for about 75% of the primary production occurring in coastal and nutrient-replete waters. The potential that variations in the ration of (super30)Si to (super28)Si in sedimentary opal may offer information on past silicon cycling is exploited. Silicon stable-isotope measurements indicated that the amount of utilization of silicic acid by diatoms in the Southern Ocean during the last glacial period, was diminished compared to the current interglacial.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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Carbon dioxide uptake at sea
Article Abstract:
Peng and colleagues claim that direct and reliable determinations of anthropogenic CO(sub2) penetration into the ocean can now be made, using an approach based on temporal measurement variations of dissolved inorganic carbon concentrations. The technique is useful if concentrations of dissolved carbon and changes in deep waters do not alter with time, which should be the case on the decadal time scale.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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