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| Titel |
Assessment of the structure and variability of Weddell Sea water masses in distinct ocean reanalysis products |
| VerfasserIn |
T. S. Dotto, R. Kerr, M. M. Mata, M. Azaneu, I. Wainer, E. Fahrbach, G. Rohardt |
| 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 ; 10, no. 3 ; Nr. 10, no. 3 (2014-06-23), S.523-546 |
| Datensatznummer |
250117007
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| Publikation (Nr.) |
 copernicus.org/os-10-523-2014.pdf |
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| Zusammenfassung |
| We assessed and evaluated the performance of five ocean reanalysis products
in reproducing essential hydrographic properties and their associated
temporal variability for the Weddell Sea, Antarctica. The products used in
this assessment were ECMWF ORAS4 (European Centre for Medium-Range Weather Forecasts Ocean Reanalysis System 4),
CFSR (Climate Forecast System Reanalysis), MyOcean UR025.4 (University of Reading),
ECCO2 (Estimating the Circulation and Climate of the Ocean, Phase II) and SODA (Simple Ocean Data Assimilation). The
present study focuses on the Weddell Sea deep layer, which is composed of
the following three main water masses: Warm Deep Water (WDW), Weddell Sea
Deep Water (WSDW) and Weddell Sea Bottom Water (WSBW). The MyOcean UR025.4
product provided the most accurate representation of the structure and
thermohaline properties of the Weddell Sea water masses when compared with
observations. All the ocean reanalysis products analyzed exhibited limited
capabilities in representing the surface water masses in the Weddell Sea.
The CFSR and ECCO2 products were not able to represent deep water masses
with a neutral density ≥ 28.40 kg m−3, which was considered the
WSBW's upper limit throughout the simulation period. The expected WDW warming
was only reproduced by the SODA product, whereas the ECCO2 product was able
to represent the trends in the WSDW's hydrographic properties. All the
assessed ocean reanalyses were able to represent the decrease in the WSBW's
density, except the SODA product in the inner Weddell Sea.
Improvements in parameterization may have as much impact on the reanalyses
assessed as improvements in horizontal resolution primarily because the
Southern Ocean lacks in situ data, and the data that are currently available are
summer-biased. The choice of the reanalysis product should be made
carefully, taking into account the performance, the parameters of interest,
and the type of physical processes to be evaluated. |
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