Primary production in the ocean depend upon availability of the major nutrients carbon, nitrogen, phosphorus, and silicon. However, a number of essential micronutrients (e.g. Fe, Mo, Co, Ni, Cu, Zn, and Cd) with atomic mass >50 may also control growth of phytoplankton. Therefore, bioavailability and speciation for trace metal is important to study. Determination of chemical forms (species) in which bio-available micronutrients are present in seawater is a challenge for chemical oceanographers. A suitabl e tool for approximation of the bioavailable amount of trace metals in natural waters is the technique of Diffusive Gradients in Thin films (DGT). The method is a true in situ sampling technique for quantification and speciation of diffusible metals in the sub-micro size range. The major focus of the proposed project will be on speciation of trace metals in surface waters along the Siberian shelf in the Arctic Ocean, using DGT and other techniques. As of yet there are no published data using DGT from the hi gh Arctic, and the Arctic Ocean provides and ideal study area for DGT because of the well confined sources for trace metal input through the Russian rivers. This interdisciplinary project will contribute to our understanding of how inorganic marine compone nts are linked to biochemical processes. Such information may be invaluable for future studies in a key region for global climate regulation, where a rapid and pronounced climatic warming has been predicted within the next 100 years.
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