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| Titel |
Thermodynamic properties of sea air |
| VerfasserIn |
R. Feistel, D. G. Wright, Hans-Jürgen Kretzschmar, E. Hagen, S. Herrmann, R. Span |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 6, no. 1 ; Nr. 6, no. 1 (2010-02-01), S.91-141 |
| Datensatznummer |
250003348
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| Publikation (Nr.) |
 copernicus.org/os-6-91-2010.pdf |
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| Zusammenfassung |
Very accurate thermodynamic potential functions are
available for fluid water, ice, seawater and humid air covering wide ranges
of temperature and pressure conditions. They permit the consistent
computation of all equilibrium properties as, for example, required for
coupled atmosphere-ocean models or the analysis of observational or
experimental data. With the exception of humid air, these potential
functions are already formulated as international standards released by the
International Association for the Properties of Water and Steam (IAPWS), and
have been adopted in 2009 for oceanography by IOC/UNESCO.
In this paper, we derive a collection of formulas for important quantities
expressed in terms of the thermodynamic potentials, valid for typical phase
transitions and composite systems of humid air and water/ice/seawater.
Particular attention is given to equilibria between seawater and humid air,
referred to as "sea air" here. In a related initiative, these formulas
will soon be implemented in a source-code library for easy practical use.
The library is primarily aimed at oceanographic applications but will be
relevant to air-sea interaction and meteorology as well.
The formulas provided are valid for any consistent set of suitable
thermodynamic potential functions. Here we adopt potential functions from
previous publications in which they are constructed from theoretical laws
and empirical data; they are briefly summarized in the appendix. The
formulas make use of the full accuracy of these thermodynamic potentials,
without additional approximations or empirical coefficients. They are
expressed in the temperature scale ITS-90 and the 2008 Reference-Composition
Salinity Scale. |
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