Production in seawater

One of the primary concerns in a study of the geochemistry of carbonates in marine waters is the calculation of the saturation state of the seawater with respect to carbonate minerals. The saturation state of a solution with respect to a given mineral is simply the ratio of the ion activity or concentration product to the thermodynamic or stoichiometric solubility product. In seawater the latter is generally used and Qmjneral is the symbol used to represent the ratio. For example ... 

In seawater, DMS is produced from dimethyl-sulphoniopropionate (DMSP), which in turn is produced by phytoplankton. Specific species of phytoplankton are found to be responsible for most of the DMSP production in seawater. According to Liss et al. (1993) the potential for production of DMS in various taxonomic groups follows the order ... 

Dahl E. E., Saltzman E. S., and De Bruyn W. J. (2003) The aqueous phase yield of alkyl nitrates from ROO + NO implications for photochemical production in seawater. Geophys. Res. Lett. 30, 1271-1273. 

Gagosian R. B. and Stuermer D. H. (1977) The cycling of biogenic compounds and their diagenetically altered transformation products in seawater. Mar. Chem. 5, 605-632. 

Most of the inorganic anions of seawater are not subject to primary photochemical processes, because their electronic excitation energies lie well above the maximum photon energy available in sea surface sunlight. Nitrate and nitrite do, however, exhibit weak transitions with meixima at 303 nm (e ax 7 mole cm ) and 355 nm (e ax = 22.5 mole" cm" ), respectively. The primary photoreactions of both of these oxyanions produce free radical products in seawater (Zafiriou and True, 1979a, b). The overall reactions are ... 

Percent aldehyde production In seawater due to photochemical degradation of the photosensitizer l.e. [(carbonyl production in distilled H2O)/(production In seawater)] X 100%. 

To be buried with the sediments is not only the end but also the start of marine recycling of phosphorus. That is to say, sediments also act as both source and sink of phosphorus. We should know the phosphorus release from sediments and phosphorus buried by the sediments because the phosphorus is very important for the primary production in seawater. 

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