Naslov
Diurnal thermocline oscillations driven by tidal flow around the island of Lastovo (Middle Adriatic)

Autori
Mihanović, Hrvoje ; Orlić, Mirko ; Pasarić, Zoran

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Recent Advances in Adriatic Oceanography and Marine Meteorology / Orlić, Mirko ; Pasarić, Miroslava - Zagreb : Geofizički odsjek Prirodoslovno-matematičkog fakulteta Sveučilišta u Zagrebu, 2008, 44-44

ISBN
978-953-6076-18-5

Skup
Recent Advances in Adriatic Oceanography and Marine Meteorology

Mjesto i datum
Dubrovnik, Hrvatska, 05.11.2008. - 07.11.2008

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Adriatic; Lastovo; thermocline oscillation; diurnal

Sažetak
Oceanographic data collected in the framework of ITHACA project (February – September 2006) have been examined in order to detect and interpret different physical processes in the Adriatic shelf break area. One of the main objectives was to gain more information on internal tides. The work comprised thermistor measurements carried out at the islands of Biševo, Sušac and Lastovo at 10 equidistant depths, between 4 and 40 m, on submarine cliffs opened to the southeast. Significant diurnal temperature oscillations were detected at Lastovo. The strongest variations were driven by the sea/land breezes (middle of July 2006). However, during several episodes between June and August 2006 diurnal wind forcing was not significant, whereas barotropic currents at an ADCP station close to Lastovo, as well as sea levels at Split and Dubrovnik, contained a pronounced diurnal signal. The wind and tidal influences on the temperature variability were separated by applying a multiple cross-wavelet spectral analysis with the hourly pseudo wind stress and sea level (or barotropic current) data treated as the inputs and the isotherm heights at Lastovo considered as the output. The analysis confirmed that significant correlation between tides and thermocline oscillations existed at the end of June, at the end of July and in August 2006. This study revealed that even in a shallow area of high bathymetric complexity subjected to micro-tides, large amplitude internal waves at diurnal tidal frequency could be generated. Diurnal internal tides were tentatively attributed to nearresonant interaction of tidal flow with the island of Lastovo under stratified conditions, resulting in the generation of baroclinic island-trapped waves.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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