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| Titel |
Seasonal sea level extremes in the Mediterranean Sea and at the Atlantic European coasts |
| VerfasserIn |
M. N. Tsimplis, A. G. P. Shaw |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 10, no. 7 ; Nr. 10, no. 7 (2010-07-09), S.1457-1475 |
| Datensatznummer |
250008305
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| Publikation (Nr.) |
 copernicus.org/nhess-10-1457-2010.pdf |
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| Zusammenfassung |
| Hourly sea level data from tide gauges and a barotropic model are used to
explore the spatial and temporal variability of sea level extremes in the
Mediterranean Sea and the Atlantic coasts of the Iberian peninsula on
seasonal time scales. Significant spatial variability is identified in the
observations in all seasons. The Atlantic stations show larger extreme
values than the Mediterranean Sea primarily due to the tidal signal. When
the tidal signal is removed most stations have maximum values of less than
90 cm occurring in winter or autumn. The maxima in spring and summer are
less than 60 cm in most stations. The wind and atmospheric forcing
contributes about 50 cm in the winter and between 20–40 cm in the other
seasons. In the western Mediterranean the observed extreme values are less
than 50 cm, except near the Strait of Gibraltar. Direct atmospheric forcing
contributes significantly to sea level extremes. Maximum sea level values
due to atmospheric forcing reach in some stations 45 cm during the winter.
During the summer the contribution of the direct atmospheric forcing is
between 10–20 cm. The Adriatic Sea shows a resonant behaviour with maximum
extreme observed sea level values around 200 cm found at the northern part.
Trends in the 99.9% percentiles are present in several areas, however
most of them are removed when the 50% percentile is subtracted indicating
that changes in the extremes are in line with mean sea level change. The
North Atlantic Oscillation and the Mediterranean Oscillation Index are well
correlated with the changes in the 99.9% winter values in the Atlantic,
western Mediterranean and the Adriatic stations. The correlation of the NAO
and the MOI indices in the Atlantic and western Mediterranean is significant
in the autumn too. The correlations between the NAO and MOI index and the
changes in the sea level extremes become insignificant when the 50%
percentile is removed indicating again that changes in extremes have been
dominated by changes in the mean sea level. |
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