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| Titel |
Daily scale wintertime sea surface temperature and IPC-Navidad variability in the southern Bay of Biscay from 1981 to 2010 |
| VerfasserIn |
G. Esnaola, J. Saénz, E. Zorita, A. Fontán, V. Valencia, P. Lazure |
| 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 ; 9, no. 4 ; Nr. 9, no. 4 (2013-07-19), S.655-679 |
| Datensatznummer |
250018110
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| Publikation (Nr.) |
 copernicus.org/os-9-655-2013.pdf |
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| Zusammenfassung |
| The combination of remotely sensed gappy Sea surface temperature (SST) images
with the missing data filling DINEOF (data interpolating empirical orthogonal functions) technique,
followed by a principal component analysis of the reconstructed data, has
been used to identify the time evolution and the daily scale variability of
the wintertime surface signal of the Iberian Poleward Current (IPC), or
Navidad, during the 1981–2010 period. An exhaustive comparison with the
existing bibliography, and the vertical temperature and salinity profiles
related to its extremes over the Bay of Biscay area, show that the obtained
time series accurately reflect the IPC-Navidad variability. Once a time
series for the evolution of the SST signal of the current over the last
decades is well established, this time series is used to propose a physical
mechanism in relation to the variability of the IPC-Navidad, involving both
atmospheric and oceanic variables. According to the proposed mechanism, an
atmospheric circulation anomaly observed in both the 500 hPa and the surface
levels generates atmospheric surface level pressure, wind-stress and
heat-flux anomalies. In turn, those surface level atmospheric anomalies
induce mutually coherent SST and sea level anomalies over the North Atlantic
area, and locally, in the Bay of Biscay area. These anomalies, both locally
over the Bay of Biscay area and over the North Atlantic, are in agreement
with several mechanisms that have separately been related to the variability
of the IPC-Navidad, i.e. the south-westerly winds, the joint effect of
baroclinicity and relief (JEBAR) effect, the topographic β effect and a
weakened North Atlantic gyre. |
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