The second mesoscale experiment in the Pomo pits (Middle Adriatic Sea, May-June 1993) Aniello RUSSO, Antonio ARTEGIANI, Mauro GALASSI, Mauro MARINI,

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Presentation transcript:

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, 60125 Ancona, ITALY Web: http://adria.irpem.an.cnr.it 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

Mappa Adriatico

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

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

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

Cumulative vertical profiles

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

Bottom maps

SW-NE cross-section (May 1993)

SW-NE cross-section (June 1993)

OAG AMEX2-2

Bathy model

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

Base C4 10 day

Base C4 11 day

Base C4 12 day

Base C4 13 day

Base C4 14 day

Base C4 15 day

Base May Baro 4 days

Base June Baro 4 days

Frc June Baro 4 days

Base June Salinity and velocity 40m

Frc June Salinity and velocity 40m

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

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.

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

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 Profili verticali modi baroclini

Profili verticali modi baroclini

Brunt-Vaisala

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

Temperature at Pescara section