Guidelines for sampling and determination of dissolved oxygen in seawater.
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The dissolved oxygen (DO) content in seawater is controlled by several unrelated processes including exchange with air, metabolism of plants and animals, microbial and chemical decomposition of organic matter, hydrodynamic features such as mixing, advection, convection, and up- or down-welling. The DO content is always the result of multifactorial influences and the reasons for changes may be difficult to assess. In stratified Baltic waters, DO depletion occurs regularly below the halocline. When only physical processes are involved, the DO concentration in water is governed by the laws of solubility, i.e., it is a function of atmospheric pressure, water temperature, and salinity. The corresponding equilibrium concentration is generally called solubility. It is an essential reference for the interpretation of DO data. Precise solubility data, tables, and mathematical functions have been established (Carpenter, 1966; Murray and Riley, 1969; Weiss, 1970) and adopted by the international.....
Sustainable Development Goals (SDG)14.a
Essential Ocean Variables (EOV)Oxygen
Spatial CoverageBaltic Sea
CitationHELCOM (2018) Guidelines for sampling and determination of dissolved oxygen in seawater. Helsinki, Finland, HELCOM, 7pp. DOI: http://dx.doi.org/10.25607/OBP-1804