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    • HELCOM Manuals and Guidelines
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    •   Repository OceanBestPractices
    • ⇒ HELCOM: Baltic Marine Environment Protection Commission
    • HELCOM Manuals and Guidelines
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    Guidelines for monitoring of water transparency (Secchi depth).

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    Date
    2017
    Corporate Author
    HELCOM
    Status
    Published
    Pages
    4pp.
    
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    Abstract
    Water transparency serves as an index for the trophic state of a water body. It reflects eutrophication through changes in the phytoplankton abundance; increase in the ambient nutrient status in the water leads to higher phytoplankton biomass that diminishes the propagation of light in the water. Water transparency is approached by Secchi depth (Cialdi and Secchi 1865, Whipple 1899). Secchi depth is influenced by dissolved and/or colloidal inorganic and organic substances as well as total suspended solids and resident seston. It is thus affected by substances unrelated to eutrophication as well. This source of error has to be taken into consideration whenever eutrophication state is assessed using Secchi depth in the Baltic Sea that is optically classified as a Case II water body (Morel and Prieur 1977), i.e., the body where concentrations of colour producing substances (e.g. phytoplankton, inorganic particles and CDOM) vary independently from each other. Those Secchi depth estimation.....
    Resource URL
    https://helcom.fi/helcom-at-work/publications/manuals-and-guidelines/
    Publisher
    HELCOM
    Helsinki, Finland
    Document Language
    en
    Sustainable Development Goals (SDG)
    14.a
    Maturity Level
    Mature
    Spatial Coverage
    Baltic Sea
    Gulf of Bothnia
    Citation
    HELCOM (2017) Guidelines for monitoring of water transparency (Secchi depth). Helsinki, Finland, HELCOM, 4pp. DOI: http://dx.doi.org/10.25607/OBP-1798
    URI
    https://repository.oceanbestpractices.org/handle/11329/2003
    http://dx.doi.org/10.25607/OBP-1798
    Collections
    • CAPARDUS Practices [212]
    • HELCOM Manuals and Guidelines [37]

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