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Ann. Geophys., 24, 2773-2780, 2006
www.ann-geophys.net/24/2773/2006/
© European Geosciences Union 2006
Diurnal internal tides detected in the Adriatic
H. Mihanović1, M. Orlić2, and Z. Pasarić2
1Hydrographic Institute of the Republic of Croatia, Zrinsko-Frankopanska 161, 21000 Split, Croatia
2Andrija Mohorovičić Geophysical Institute, Faculty of Science, University of Zagreb, Horvatovac bb, 10000 Zagreb, Croatia
Abstract. Strong diurnal oscillations, documented by temperature data that were
collected along a submarine cliff on the Lastovo Island (southern Adriatic),
are studied and compared with sea level and wind measurements at Dubrovnik
and Komiža (island of Vis). Three thermistors were deployed at the
depths of 15, 22 and 36 m between March 2001 and March 2002. Pronounced
diurnal temperature oscillations were detected at 15 and 22 m during the
stratified season. The correlation between the sea surface and thermocline
displacements was highest in June 2001, when diurnal wind changes were not
significant, while diurnal sea level oscillations achieved annual maxima.
Thermocline oscillations were in phase with sea level changes. The range of
diurnal sea surface variability was close to 19 cm, while the range of
corresponding thermocline variability was about 5.4 m. The findings
summarize the outcome of the first dedicated study of internal tides in the
Adriatic.
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