An Overview of Atmospheric-Ocean Integrated Mercury Research Aimed to Understand the Mercury Cycle in the Mediterranean Region. (Articolo in rivista)

Type
Label
  • An Overview of Atmospheric-Ocean Integrated Mercury Research Aimed to Understand the Mercury Cycle in the Mediterranean Region. (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Pirrone N.; Hedgecock J.M.; Sprovieri F.; Cinnirella S., Trunfio G.A.; (2006)
    An Overview of Atmospheric-Ocean Integrated Mercury Research Aimed to Understand the Mercury Cycle in the Mediterranean Region.
    in Eos (Wash. D.C.)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Pirrone N.; Hedgecock J.M.; Sprovieri F.; Cinnirella S., Trunfio G.A.; (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR-IIA (literal)
Titolo
  • An Overview of Atmospheric-Ocean Integrated Mercury Research Aimed to Understand the Mercury Cycle in the Mediterranean Region. (literal)
Abstract
  • A significant amount of research indicates that natural and human (anthropogenic) activities can redistribute mercury in the atmospheric, soil and water ecosystems through a complex combination of transport and transformation processes. Advances have been made in understanding key mechanisms affecting atmospheric mercury, including transport, chemical and physical transformations and its transfer to aquatic and terrestrial receptors by dry deposition and wet scavenging by precipitation. However, our current understanding of several key processes influencing the cycling of mercury in the environment, such as the chemical and physical processes (biotic and abiotic) which influence the mobility of mercury in soils and sediments or the exchange of gaseous mercury at the air-water interface, is presently not sufficient for quantitative descriptions and thus neither for modelling. Although decreasing trends in atmospheric deposition with decreasing atmospheric emissions have been observed, due to the complex transfer and transformation pathways which lead from atmospheric mercury input to the toxic methylmercury found in the aquatic environment, a linear relationship between mercury deposition and methylmercury levels in fish does not exist. Moreover, recent studies carried out in different coastal areas and open seas regions of European seas have shown that marine ecosystems can act as both a source and a sink in the global mercury cycle depending on meteorological conditions and numerous environmental factors. Mercury pollution issues have been investigated in the context of several integrated research projects (MAMCS, MED-OCEANOR, MERCYMS, ESPREME) funded by the European Commission as part of the 4th, 5th and 6th Framework Programmes, and national funding in most of Mediterranean countries. With the above in mind, one may wish to ask what are the qualitative and quantitative relationships between atmospheric input, that is deposition, and the Hg in aquatic environments? Is it possible to establish a deposition limit for mercury in order to regulate its emissions to the atmosphere? Do we know the relationship between the flux of mercury entering surface waters and the level of mercury (methyl mercury) found in fish? How is it possible to evaluate the response time of the marine ecosystem in relation to changes in atmospheric emissions? Are any regional/hemispherical modeling frameworks validated and tested for assessing temporal and spatial patterns of mercury deposition to marine waters and its subsequent accumulation in the fish and ultimately its impact on the food chain? The aim of this paper is to provide an overview on past and current research activity carried out on different aspects involved in the mercury cycling between the atmosphere and the MEditerranean sea, and its implications on the formulation and implementation of the EU Policy for the protection of human health and marine ecosystems. (literal)
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