Variability of inorganic and organic phosphorus turnover rates in the coastal ocean

Article Abstract:

Research into in situ phosphorus (P)-turnover rates in the Wilkinson basin in the Gulf of Maine involving measuring the activities of the cosmogenic radionuclides 32P and 33P has indicated a seasonal link between P ages and trophic level. It has also been possible to provide further evidence that rising primary production within the Gulf of Maine does not immediately lead to a rise in macrozooplankton P uptake. The measurement of 32P and 33P within dissolved and particulate pools has produced valuable information about the temporal variability of P cycling in the upper ocean.

Environmental aspects, Phosphorus, Phosphorus (Chemical element), Marine microbiology

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Uranium-thorium disequilibria and partitioning on melting of garnet peridotite

Article Abstract:

Most recent mid-ocean-ridge and ocean-island basalts suggests that mineral-melt pair thorium is more discordant than uranium. A garnet-melt partitioning data confirms this implication. Most mid-ocean-ridge basalts and ocean-island basalts are created by a sluggish, near-fractional melting cracking at depths where garnet is stable and magma is generated more slowly at low porosities. Rare-earth element concentrations of mantle-melting imply that melting is done in a near-fractional manner.

Garnet

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Short residence time of colloids in the upper ocean estimated from 238U-234Th disequilibria

Article Abstract:

Colloidal matter is believed to influence the chemistry and biology of the upper ocean. The production of the isotope 234 thorium (234Th) from its parent isotope 238 uranium was used to determine the residence time of colloidal matter in the surface waters off Bermuda. The mean residence time for colloidal 234Th until it forms into small particles was found to be 10 days, indicating that the macromolecular colloidal matter in the upper ocean is highly unstable.

Colloids, Chemical oceanography

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