The second mesoscale experiment in the Pomo pits (Middle Adriatic Sea, May-June 1993)
description
Transcript of 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. ZAVATARELLIC.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
The second mesoscale experiment in the Pomo pits
(Middle Adriatic Sea, May-June 1993)
12° E 13° E 14° E 15° E 16° E 17° E 18° E 19° E39° N
40° N
41° N
42° N
43° N
44° N
45° N
46° N
20
40
60
80
200
P o
A n c o n a
V i e s t e
S p l i t
160
1000200
IONIAN SEA
Otranto
Pescara
Sibenik
Bari
Dubrovnik100
800
Pelagosa sill
Otranto sill
Pomo Pits
Mappa Adriatico
Schematic of the Adriatic Sea General Circulation(from Artegiani et al., 1997)
Position of the stations for the two experiments
101103
105107
109111
113115
117
119
121
201203
205
207101
211213
215
217
219221
301
303305
307309
311313
315317
319321
401403
405
407409
411413
415
417419
421
501503
505
507509
511513
515517
519521
601
603605
607
609611
613615
617
619621
701703
705707
709711
713715
717719
721
AM EX2-A station positions
14° 10' E 15° 00' E42° 10' N
43° 00' N
20 40 60 80100
120
120
140
140160
160
180
200
200 140
101
103105
107109
111113
115117
119
121
201203
205207
209211
213215
217219
221
301
303305
307309
313315
317
319
321
401403
405
407409
411413
415
417419
421
501503
505507
509511
513515
517
519521
601
603605
607
609611
613
615617
619
621
701703
705707
709711
713
715717
719721
801803
805807
809811
813815
817819
821
AM EX2-B station positions
14° 10' E 15° 00' E42° 10' N
43° 00' N
20 40 60 80100
120
120
140
140160
160
180
200
200 140
9-11 May 1993 6-9 June 1993
Position of the stations for the two experiments. The maps are rotated and converted to a cartesian reference system.
-40 -20 0 20 40k m
A M E X 2 - 1 S t a t i o n p o s i t i o n s
-40
-20
0
20
40
km
2 0 0
1 00
-40 -20 0 20 40k m
A M E X 2 - 2 S t a t i o n p o s i t i o n s
-40
-20
0
20
40
2 0 0
1 0 0
9-11 May 199375 CTD casts
6-9 June 199382 CTD casts
+ CTD cast Chem ical cast
Cumulative vertical profiles
1 0 1 5 2 0 2 5Tem perature (°C )
0
50
100
150
200
250
300
pres
sure
(db
)
0
50
100
150
200
250
300
35 36 37 38 39Salin ity (psu)
AMEX2-B June 1993
AMEX2-A May 1993
Dep
th (
m)
% sat. O2 Nitrate (µM) Silicate (µM)
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
Bottom maps
AM EX2-A bottom tem perature
20 40 60 80100
120
120
140
140160
160
180
200
200 140
10.210.310.410.510.610.710.810.911.011.111.211.311.411.511.611.711.811.9
AM EX2-B bottom d isso lved oxygen
20 40 60 80100
120
120
140
140160
160
180
200
200 140
5.005.055.105.155.205.255.305.355.405.455.505.555.605.655.705.755.805.855.905.956.00
AM EX2-B bottom tem perature
20 40 60 80100
120
120
140
140160
160
180
200
200 140
10.210.310.410.510.610.710.810.911.011.111.211.311.411.511.611.711.811.9
AM EX2-B bottom sa lin ity
20 40 60 80100
120
120
140
140160
160
180
200
200 140
38.2038.2238.2438.2638.2838.3038.3238.3438.3638.3838.4038.4238.4438.4638.4838.50
AM EX2-A bottom sa lin ity
20 40 60 80100
120
120
140
140160
160
180
200
200 140
38.2038.2238.2438.2638.2838.3038.3238.3438.3638.3838.4038.4238.4438.4638.4838.50 AM EX2-A bottom d isso lved oxygen (m l/l)
20 40 60 80100
120
120
140
140160
160
180
200
200 140
5.005.055.105.155.205.255.305.355.405.455.505.555.605.655.705.755.805.855.905.956.00
SW-NE cross-section (May 1993)
SW-NE cross-section (June 1993)
OAG AMEX2-2
Bathy model
Global OA parametersZonal and meridional zero crossing of the correlation: 40 kmZonal decorrelation (decay) scale: 20 kmTime decorrelation: 7 daysPE model domainGrid: 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
Wind AMEX
-8
-6
-4
-2
0
2
4
6
8
-8 -6 -4 -2 0 2 4 6 8
may93
june93ECMWF 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).
- Nesting in an Adriatic model to improve boundary conditions
- Refinements of meteo forcing (ECMWF reanalyzes, offshore
platforms)
- Real time regional forecast experiment
- Ecosystem studies.
- 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
Main remarks from the first simulations
Future Perspectives
AMEX1 Sep. 1989 Profili verticali modi baroclini
From Paschini et al., D.S.R.1993
Profili verticali modi baroclini
Baroclinic vertical modes
Squared Brunt-Vaisala frequency(N2)
First internal Rossby radius:AMEX Sept. 1989: 5.4 kmAMEX2-A May 1993: 3.5 - 4.0 kmAMEX2-B June 1993: 4.5 - 5.0 km
Profili verticali modi baroclini
Brunt-Vaisala
0.00E+00
1.00E-03
2.00E-03
3.00E-03
0 50 100
150
200
250
413B BVF 413A BVF
Alongshore cross-section in the Western Pomo Pit (May 1993)
0 20 40 60 80 100 120 140 160km
-250
-200
-150
-100
-50
0
m
-250
-200
-150
-100
-50
0
m
W IN TER
0 20 40 60 80 100 120 140 160km
Tem perature (°C ) a long the Pescara-S ibenik section (c.i. 0.5)
SPRIN G
SUM M ER AUTUM N6.07.08.09.010.011.012.013.014.015.016.017.018.019.020.021.022.023.024.025.026.027.0
Temperature at Pescara section