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| Titel |
Assessment of the three dimensional temperature and salinity observational networks in the Baltic Sea and North Sea |
| VerfasserIn |
W. Fu, J. L. Høyer, J. She |
| 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 ; 7, no. 1 ; Nr. 7, no. 1 (2011-01-28), S.75-90 |
| Datensatznummer |
250004432
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| Publikation (Nr.) |
 copernicus.org/os-7-75-2011.pdf |
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| Zusammenfassung |
The spatial averaged correlations are presented in 1.5° × 1.5° bins
for the North and Baltic Sea region. The averaged correlations are computed
based on the proxy ocean data generated by the operational forecast model of
Danish Meteorology Institute (DMI). It is shown that the spatial
distribution of the averaged correlations could reflect the overall
influence of the local atmospheric forcing, complex topography, coastlines,
boundary and bottom effect, etc. Comparisons with the satellite SST data
demonstrate that the proxy ocean data reproduce realistic results at the
surface. Based on the spatial bin-averaged correlations, a general
correlation model is assumed to approximate the spatial and temporal
correlation structure. Parameters of the correlation model are obtained on
the standard Levitus levels. It is found that the correlation model is not
the typical Guaussian-type function. For instance, the exponents of the
correlation model vary in the longitudinal direction from 0.75 at the
surface to 1.33 at the depth of 250 m for temperature. For salinity, the
temporal correlation can be approximated with an exponential function.
Two complementary quality-indicators, effective coverage rate and
"explained" variance, are defined based on the correlation models obtained
above. The two indicators are able to identify the "influence area" of the
information content in a given observation network and the relative
importance of observations at different locations. By these indicators, the
3-D temperature and salinity observational networks are assessed in the
Baltic Sea and North Sea for the period 2004–2006. It is found that the
surface level is more effectively covered than the deep waters with existing
networks. In addition, the Belt Sea and the Baltic Proper also show good
coverage for both temperature and salinity. However, more observations are
required in the Norwegian Trench and Kattegat. In the vertical, the two
indicators show smaller values from 50 m to 125 m in this region, indicating
the need for more observations. |
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