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ITHACA: First Findings from CTD Profiling Ivica Vilibić, Branka Grbec Institute of Oceanography and Fisheries, Split, Croatia www.izor.hr and ITHACA CTD.

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Presentation on theme: "ITHACA: First Findings from CTD Profiling Ivica Vilibić, Branka Grbec Institute of Oceanography and Fisheries, Split, Croatia www.izor.hr and ITHACA CTD."— Presentation transcript:

1 ITHACA: First Findings from CTD Profiling Ivica Vilibić, Branka Grbec Institute of Oceanography and Fisheries, Split, Croatia www.izor.hr and ITHACA CTD Task Force Team The SettingThe Setting Ambient CharacteristicsAmbient Characteristics Internal WavesInternal Waves

2 The setting www.gfz.hr/oceanografija/Ithaca DART-ITHACA Coordination Meeting Zagreb, Croatia, 30.11-01.12.2006. CruiseDate ITHACA0114 February 2006 ITHACA0226 June 2006 DART0320/21 September 2006 ITHACA0428 September 2006 ITHACA0529/30 September 2006 T, S, DO,...

3 Ambient Characteristics www.gfz.hr/oceanografija/Ithaca DART-ITHACA Coordination Meeting Zagreb, Croatia, 30.11-01.12.2006. ITHACA01, 14 February 2006

4 Ambient Characteristics www.gfz.hr/oceanografija/Ithaca DART-ITHACA Coordination Meeting Zagreb, Croatia, 30.11-01.12.2006. ITHACA02, 26 June 2006

5 Ambient Characteristics www.gfz.hr/oceanografija/Ithaca DART-ITHACA Coordination Meeting Zagreb, Croatia, 30.11-01.12.2006. DART03, 20/21 September 2006

6 Ambient Characteristics www.gfz.hr/oceanografija/Ithaca DART-ITHACA Coordination Meeting Zagreb, Croatia, 30.11-01.12.2006. ITHACA04, 28 September 2006

7 Ambient Characteristics www.gfz.hr/oceanografija/Ithaca DART-ITHACA Coordination Meeting Zagreb, Croatia, 30.11-01.12.2006. TS diagram

8 Internal Waves www.gfz.hr/oceanografija/Ithaca DART-ITHACA Coordination Meeting Zagreb, Croatia, 30.11-01.12.2006. ITHACA02, 26 June 2006

9 Internal Waves www.gfz.hr/oceanografija/Ithaca DART-ITHACA Coordination Meeting Zagreb, Croatia, 30.11-01.12.2006. DART03, 20/21 June 2006

10 Internal Waves www.gfz.hr/oceanografija/Ithaca DART-ITHACA Coordination Meeting Zagreb, Croatia, 30.11-01.12.2006. ITHACA04 ITHACA05

11 Internal Waves www.gfz.hr/oceanografija/Ithaca DART-ITHACA Coordination Meeting Zagreb, Croatia, 30.11-01.12.2006. Simple estimates Theoretical wavelength ( it,t ) and velocity (V it,t ) of internal waves, computed through two-layer model and assuming that they are diurnal internal tides (period of 24 h). The depths h and H and densities ρ h and ρ H are estimated from CTD sections. CruisehHρhρh ρHρH V it,t it,t 26 Jun 2006811225.228.80.51 m/s43.7 km 20 Sep 2006249626.628.80.63 m/s54.8 km 28 Sep 2006388226.728.80.72 m/s62.3 km 29 Sep 2006388226.728.80.72 m/s62.3 km Empirical wavelength ( it,e ) and velocity (V it,e ) of internal waves, computed from CTD sections assuming that they are diurnal internal tides (period of 24 h). CTD is the non- transformed wavelength estimated from the transects, Δt is time needed for the sampling of one internal wave, while A is tentatively estimated wave amplitude. Cruise CTD ΔtA (tent.) Tides V it,e it,e 26 Jun 200635 km5 h2-4 m neap 0.50 m/s42.3 km 20 Sep 200650 km6 h7-8 m neap 0.72 m/s62.5 km 28 Sep 200628 km-4 h4/12 m spring 0.27 m/s23.3 km 29 Sep 200637 km-5 h8-10 m spring 0.34 m/s29.3 km

12 Internal Waves www.gfz.hr/oceanografija/Ithaca DART-ITHACA Coordination Meeting Zagreb, Croatia, 30.11-01.12.2006. But what about internal seiches (21.2 h), internal inertial oscillations (17.6 h),... The true nature of observed internal oscillations will be seen on other data: ADCP, thermistor chain, bottom pressure gauge.

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