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| Titel |
Thermophysical property anomalies of Baltic seawater |
| VerfasserIn |
R. Feistel, G. M. Marion, R. Pawlowicz, D. G. Wright |
| 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. 4 ; Nr. 6, no. 4 (2010-11-18), S.949-981 |
| Datensatznummer |
250003683
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| Publikation (Nr.) |
 copernicus.org/os-6-949-2010.pdf |
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| Zusammenfassung |
While the thermodynamic properties of Standard Seawater are very well known,
the quantitative effect of sea salt composition anomalies on various
properties is difficult to estimate since comprehensive lab experiments with
the various natural waters are scarce. Coastal and estuarine waters exhibit
significant anomalies which also influence to an unknown amount the routine
salinity calculation from conductivity measurements.
Recent numerical models of multi-component aqueous electrolytes permit the
simulation of physical chemical properties of seawater with variable solute
composition. In this paper, the FREZCHEM model is used to derive a Gibbs
function for Baltic seawater, and the LSEA_DELS model to provide
estimates for the conductivity anomaly relative to Standard Seawater. From
additional information such as direct density measurements or empirical
salinity anomaly parameterisation, the quantitative deviations of properties
between Baltic and Standard Seawater are calculated as functions of salinity
and temperature. While several quantities show anomalies that are comparable
with their measurement uncertainties and do not demand special improvement,
others exhibit more significant deviations from Standard Seawater
properties. In particular density and sound speed turn out to be
significantly sensitive to the presence of anomalous solute. Suitable
general correction methods are suggested to be applied to Baltic Sea samples
with known Practical Salinity and, optionally, directly determined density. |
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