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.

Isotopes, Silicon

---

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.

Research, Carbon dioxide

---

Similar abstracts:

• Abstracts: Seismic anisotropy as an indicator of mantle flow beneath the Himalayas and Tibet. The rise and fall of Tibet
• Abstracts: Neural computation of log likelihood in control of saccadic eye movements. Premotor commands encode monocular eye movements
• Abstracts: On the spurious occurrence of Tit for Tat in pairs of predator-approaching fish. Fractal time in animal behaviour: the movement activity of Drosophila
• Abstracts: Transmissions to mice indicate that 'new variant' CJD is caused by the BSE agent. Mice and beef and brain diseases
• Abstracts: Optical detection of a quantal presynaptic membrane turnover. Beta-arrestin acts as a clathrin adaptor in endocytosis of the beta(sub-2)-adrenergic receptor

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.