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Accurate polynomial expressions for the density and specific volume of seawater using the TEOS-10 standard
Stockholm University, Faculty of Science, Department of Meteorology .
Number of Authors: 4
2015 (English)In: Ocean Modelling, ISSN 1463-5003, E-ISSN 1463-5011, Vol. 90, 29-43 p.Article in journal (Refereed) Published
Abstract [en]

A new set of approximations to the standard TEOS-10 equation of state are presented. These follow a polynomial form, making it computationally efficient for use in numerical ocean models. Two versions are provided, the first being a fit of density for Boussinesq ocean models, and the second fitting specific volume which is more suitable for compressible models. Both versions are given as the sum of a vertical reference profile (6th-order polynomial) and an anomaly (52-term polynomial, cubic in pressure), with relative errors of similar to 0.1% on the thermal expansion coefficients. A 75-term polynomial expression is also presented for computing specific volume, with a better accuracy than the existing TEOS-10 48-term rational approximation, especially regarding the sound speed, and it is suggested that this expression represents a valuable approximation of the TEOS-10 equation of state for hydrographic data analysis. In the last section, practical aspects about the implementation of TEOS-10 in ocean models are discussed.

Place, publisher, year, edition, pages
2015. Vol. 90, 29-43 p.
Keyword [en]
Physical oceanography, Equation of scare, TEOS-10, Ocean thermodynamics, Ocean modelling, Seawater density
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-118527DOI: 10.1016/j.ocemod.2015.04.007ISI: 000355148400003OAI: oai:DiVA.org:su-118527DiVA: diva2:846607
Available from: 2015-08-17 Created: 2015-06-22 Last updated: 2017-12-04Bibliographically approved

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