Marine chemistry in the coastal environment; principles, perspective and prospectus

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doi: 10.1007/s10498-016-9296-0
Authors:Church, Thomas M.
Author Affiliations:Primary:
University of Delaware, School of Marine Science and Policy, Newark, DE, United States
Volume Title:Coastal chemical oceanography; a tribute to Thomas M. Church
Volume Authors:Cutter, Gregory A., prefacer; Burdige, David J.
Source:Coastal chemical oceanography; a tribute to Thomas M. Church, prefaced by Gregory A. Cutter and David J. Burdige. Aquatic Geochemistry, 22(4), p.375-389. Publisher: Springer, Dordrecht, Netherlands. ISSN: 1380-6165
Publication Date:2016
Note:In English. 66 refs.; illus.
Summary:Marine chemistry of the coastal environment starts with principles of rock weathering that use carbonic acid to mobilize elements, only some of which comprise the majority of sea salt. The principle reason is reverse weathering, extensively represented in coastal waters, and returns most elements to newly formed colloids or minerals while recycling carbon dioxide to the atmosphere. This includes the deeper ocean expanse of sediment diagenesis, plus hydrothermal plumes and attendant low-temperature basalt alteration. Within the estuarine and extended shelf regimes, both conservative and non-conservative processes can be distinguished and modeled to determine proportions of weathered elements transmitted to the sea or consumed by reverse weathering. Conceptually, the steady-state processes that lead to the composition of seawater can be viewed as heterogeneous equilibria between dissolved constituents and solid mineral products taking hundreds of millennia. However, initial processes in the estuarine and coastal environment are characterized by shorter term scavenging associated with inorganic and organic colloids. These recycle both carbon and trace elements on timescales commensurate with estuarine flushing and coastal exchange with the ocean. The natural uranium and thorium decay series provide powerful tools for quantifying the rates of estuarine processes, including those within groundwater and the subterranean estuary. In the future, new mass spectrometric and nuclear magnetic resonance techniques will help to define the molecular nature of newly formed estuarine colloids as has been done for dissolved organic matter. As the coastal environment undergoes the forces of climate change in the form of warming and sea level rise, future research should address how these will impact chemistry of the coastal environment as a net source or sink of carbon dioxide and associated organic material. Copyright 2016 Springer Science+Business Media Dordrecht
Subjects:Actinides; Alkaline earth metals; Biochemistry; Carbon; Case studies; Coastal environment; Colloidal materials; Estuaries; Estuarine environment; Geochemistry; Ground water; Hydrochemistry; Isotope ratios; Isotopes; Lead; Marine environment; Metals; Mixing; Noble gases; Pb-210; Po-210; Pollutants; Pollution; Polonium; Ra-224; Ra-226; Ra-228; Radioactive isotopes; Radium; Radon; Residence time; Review; Rn-222; Salinity; Shelf environment; Solutes; Th-228; Th-232/Th-230; Th-234; Th/U; Thorium; U-234; U-238; Uranium; Weathering; Wetlands; Atlantic Ocean; Delaware Bay; Delaware River basin; North Atlantic; Northwest Atlantic; United States; Box models; Ra-223
Record ID:2019036722
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany
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