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| Titel |
A global algorithm for estimating Absolute Salinity |
| VerfasserIn |
T. J. McDougall, D. R. Jackett, F. J. Millero, R. Pawlowicz, P. M. Barker |
| 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 ; 8, no. 6 ; Nr. 8, no. 6 (2012-12-21), S.1123-1134 |
| Datensatznummer |
250006022
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| Publikation (Nr.) |
 copernicus.org/os-8-1123-2012.pdf |
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| Zusammenfassung |
The International Thermodynamic Equation of Seawater – 2010 has defined the
thermodynamic properties of seawater in terms of a new salinity variable,
Absolute Salinity, which takes into account the spatial variation of the
composition of seawater. Absolute Salinity more accurately reflects the
effects of the dissolved material in seawater on the thermodynamic
properties (particularly density) than does Practical Salinity.
When a seawater sample has standard composition (i.e. the ratios of the
constituents of sea salt are the same as those of surface water of the North
Atlantic), Practical Salinity can be used to accurately evaluate the
thermodynamic properties of seawater. When seawater is not of standard
composition, Practical Salinity alone is not sufficient and the Absolute
Salinity Anomaly needs to be estimated; this anomaly is as large as 0.025 g kg−1 in the northernmost North Pacific. Here we provide an algorithm
for estimating Absolute Salinity Anomaly for any location (x, y, p) in the world
ocean.
To develop this algorithm, we used the Absolute Salinity Anomaly that is found
by comparing the density calculated from Practical Salinity to the density
measured in the laboratory. These estimates of Absolute Salinity Anomaly
however are limited to the number of available observations (namely 811). In
order to provide a practical method that can be used at any location in the
world ocean, we take advantage of approximate relationships between Absolute
Salinity Anomaly and silicate concentrations (which are available globally). |
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