Evaluation of uncertainty of measurement of practical salinity in oceanographic research

A.N. Grekov, N.A. Grekov, E.N. Sychov

Institute of  Natural and Technical Systems, Russian Federation, Sevastopol, Lenin St., 28

Email: ngrekov@nm.ru

DOI: 10.33075/2220-5861-2018-1-13-22

UDC 551.46.08

Abstract:

   The algorithm is developed to calculate uncertainty estimates for practical salinity measurements. The dependence of the practical salinity on the input parameters of the electrical conductivity, temperature and pressure is analyzed. The diagrams of sensitivity coefficients of practical salinity from the input parameters are suitable for practical calculations. The diagrams of estimates of the uncertainty components of measurements by input parameters and estimates of the total standard uncertainty of practical salinity measurements for four classes of measuring instruments are calculated. Diagrams of uncertainty estimates of measurements of the practical salinity of sea water can be used in oceanographic studies and in the work of metrological laboratories.

Keywords: sea water, practical salinity, specific electric conductivity, sensitivity coefficients, standard uncertainty, total uncertainty of measurements.

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LIST OF REFERENCES

  1. Perkin R.G., Levis T.L. The Practical Salinity Scale 1978: Fitting the Date. IEEE // J. of Oceanic Engineering, 1980. OE5. P. 107–114.
  2. IOC, SCOR and IAPSO, 2010: The international thermodynamic equation of seawater – 2010: Calculation and use of thermodynamic properties. Intergovernmental Oceanographic Commission, Manuals and Guides No. 56, UNESCO (English), 196 pp. (Available from http://www.TEOS-10.org).
  3. GOST R 54500.3-2011/ ISO Guide/IEC 98-3: 2008. The uncertainty of the measurement. Part 3. The guide to the expression of uncertainty in measurement.
  4. Levashov D. I. Technique of expeditionary research, Moscow: VNIRO Publishing house, 2003, P. 399.

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