1. The second mesoscale experiment in the Pomo pits (Middle Adriatic Sea, May-June 1993)
Aniello RUSSO, Antonio ARTEGIANI, Mauro GALASSI, Mauro MARINI, Elio PASCHINI
C.N.R. - Istituto di Ricerche sulla PEsca Marittima (IRPEM)
L.go Fiera della Pesca, Ancona, ITALY Web:
N. PINARDI, M. ZAVATARELLI
C.N.R. - Istituto per le Metodologie Geofisiche Ambientali, Bologna, Italy
F. RAICICH
C.N.R. - Istituto Talassografico Sperimentale, Trieste, Italy
A. R. ROBINSON, C. J. LOZANO
Department of Earth and Planetary Sciences, Harvard University, Cambridge, USA

2. Mappa Adriatico

3. Schematic of the Adriatic Sea General Circulation (from Artegiani et al., 1997)

4. Position of the stations for the two experiments
9-11 May 1993
6-9 June 1993

5. Position of the stations for the two experiments
Position of the stations for the two experiments. The maps are rotated and converted to a cartesian reference system.
9-11 May 1993
75 CTD casts
6-9 June 1993
82 CTD casts

6. Cumulative vertical profiles

7. Vertical profiles in the Western Pomo Pit in the 1993-96 period
Depth (m)
% sat. O2
Nitrate (µM)
Silicate (µM)
After a bottom water renewal, in the bottom layer density(not showed) and % of dissolved oxygen saturation decrease while temperature (not showed) and nutrient salts concentration increase

8. Bottom maps

9. SW-NE cross-section (May 1993)

10. SW-NE cross-section (June 1993)

11. OAG AMEX2-2

12. Bathy model

13. Zonal and meridional zero crossing of the correlation: 40 km
Global OA parameters
Zonal and meridional zero crossing of the correlation: 40 km
Zonal decorrelation (decay) scale: 20 km
Time decorrelation: 7 days
PE model domain
Grid: 39*39*20 levels
2 km horizontal resolution, 5 flat level and 15 sigma levels
11 May 1993
7 June 1993
Base
Base + ext. Forcing
Assimilation
Base B
Base + ext. Forcing B
Simulations table

14. Base C4 10 day

15. Base C4 11 day

16. Base C4 12 day

17. Base C4 13 day

18. Base C4 14 day

19. Base C4 15 day

20. Base May Baro 4 days

21. Base June Baro 4 days

22. Frc June Baro 4 days

23. Base June Salinity and velocity 40m

24. Frc June Salinity and velocity 40m

25. ECMWF wind in the AMEX domain.
The average intensity in June 1993 (3.4 m/s) was about 20% greater than in May 1993 (2.8 m/s).
Wind AMEX

26. Main remarks from the first simulations
- Barotropic velocities dominate the Pits area in spring, with currents forming filaments about 10 km wide - Baroclinic field determines the coastal currents, with an evident 5 days oscillation - Wind forcing do not affect the May 1993 simulation, while it is able to reverse the June circulation in the Pits
Future Perspectives
- Nesting in an Adriatic model to improve boundary conditions - Refinements of meteo forcing (ECMWF reanalyzes, offshore platforms) - Real time regional forecast experiment - Ecosystem studies.

27. AMEX1 Sep. 1989 Profili verticali modi baroclini
From Paschini et al., D.S.R.1993
AMEX1 Sep Profili verticali modi baroclini

28. Profili verticali modi baroclini
Squared Brunt-Vaisala frequency
(N2)
Baroclinic vertical modes
First internal Rossby radius:
AMEX Sept. 1989: km
AMEX2-A May 1993: km
AMEX2-B June 1993: km
Profili verticali modi baroclini

29. Profili verticali modi baroclini

30. Brunt-Vaisala

31. Alongshore cross-section in the Western Pomo Pit (May 1993)

32. Temperature at Pescara section