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MESOSCALE DYNAMICS IN THE MIDDLE ADRIATIC DEPRESSIONS (SPRING 1993)

MESOSCALE DYNAMICS IN THE MIDDLE ADRIATIC DEPRESSIONS (SPRING 1993). A. RUSSO , A. ARTEGIANI, E. PASCHINI C.N.R. - Istituto di Ricerche sulla PEsca Marittima (IRPEM) L.go Fiera della Pesca, 60125 Ancona, ITALY Web: http://adria.irpem.an.cnr.it C. J. LOZANO, A. R. ROBINSON

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MESOSCALE DYNAMICS IN THE MIDDLE ADRIATIC DEPRESSIONS (SPRING 1993)

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  1. MESOSCALE DYNAMICS IN THE MIDDLE ADRIATIC DEPRESSIONS (SPRING 1993) A. RUSSO, A. ARTEGIANI, E. PASCHINI C.N.R. - Istituto di Ricerche sulla PEsca Marittima (IRPEM) L.go Fiera della Pesca, 60125 Ancona, ITALY Web: http://adria.irpem.an.cnr.it C. J. LOZANO, A. R. ROBINSON Department of Earth and Planetary Sciences, Harvard University, Cambridge, USA N. PINARDI, M. ZAVATARELLI C.N.R. - I.S.A.O., Bologna, Italy

  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. Cumulative vertical profiles

  6. OAG AMEX2-2

  7. Bathy model

  8. Simulations table 11 May 1993 7 June 1993 Base Base + ext. Forcing Base B Base + ext. Forcing B Assimilation 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 levels and 15 sigma levels Assimil.+ext. Forcing

  9. Base C4 13 day

  10. BaseB Salinity and velocity 40m

  11. frcB Salinity and velocity 40m

  12. Wind AMEX 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).

  13. Ass Salinity and velocity 40m

  14. Ass+ frc Salinity and velocity 40m

  15. Main remarks from the six examined simulations - Baroclinic component determines the coastal current, that represents one branch of the known ciclonic general circulation of the Meso-Adriatic Depressions;- Barotropic velocities dominate the Pits area in spring, with currents forming filaments about 10 km wide; the two “holes” are occupied by variable eddies, surrounded by an anticiclonic circulation;- Wind forcing did not affect the May 1993 simulation, while it was able to reverse the circulation in the Pits for the simulations initialized with the June data; this should be due to instability of June simulations, in fact wind stresses were similarly weak both in May and June, and the reversal did not appear between the two runs with data assimilation; - T, S and internal velocity data from the June cruise have been successfully assimilated through intermittent Optimal Interpolation; the two simulations with data assimilation were similar and much more stable than the previous ones. Next Improvements and Perspectives - Nesting in an Adriatic model to improve boundary conditions- Refinements of the atmospheric forcing (ECMWF reanalyzes, offshore platforms)- Real time regional forecast experiments- Ecosystem studies.

  16. Base May Baro 4 days

  17. Base June Baro 4 days

  18. Frc June Baro 4 days

  19. 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

  20. Bottom maps

  21. % sat. O2 Nitrate (µM) Silicate (µM) Depth (m) Vertical profiles in the Western Pomo Pit in the 1993-96 period 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

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

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

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

  25. Profili verticali modi baroclini Squared Brunt-Vaisala frequency (N2) Baroclinic vertical modes First internal Rossby radius: AMEX Sept. 1989: 5.4 km AMEX2-A May 1993: 3.5 - 4.0 km AMEX2-B June 1993: 4.5 - 5.0 km

  26. Profili verticali modi baroclini

  27. Brunt-Vaisala

  28. Base C4 10 day

  29. Base C4 11 day

  30. Base C4 12 day

  31. Base C4 14 day

  32. Base C4 15 day

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

  34. Temperature at Pescara section

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