MODELING THE AEGEAN AND LEVANTINE BASINS

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MODELING THE AEGEAN AND LEVANTINE BASINS

• G.KORRES, A.LASCARATOS AND S.SOFIANOS
• OCEAN PHYSICS AND MODELING GROUP
• UNIVERSITY OF ATHENS

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The Aegean-Levantine Eddy Resolving Model
(ALERMO) is an implementation of POM (Princeton
Ocean Model) code in the area east of 22oE with
a grid resolution of 1/20? x 1/20? and 30 sigma
layers in the vertical.OPEN BOUNDARY
CONDITIONSOne-way nesting (involving T,S,
baroclinic and barotropic velocity) to
Mediterranean OGCM (1/80x1/80) perpetual year run
(8th year).MODEL INITIALIZATIONThe model is
initialized from MODB-MED4 autumn T,S gridded
data with zero initial velocities.
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SURFACE BOUNDARY CONDITIONS 1.
MOMENTUM Wind stress provided by THE
ECMWF perpetual year (1979-1993) monthly
climatology (1? ? 1? )
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The solar radiation flux Qs is directly added to
the heat equation through the term
where The transmission coefficient Tr is set
equal to 0.77 while the attenuation coefficients
are ?10.666 m-1 and ?2 0.0714 m-1
(Jerlovs (1976) water type II classification).
The double exponential distribution of R is taken
from Paulson and Simpson (1977)
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3. SALINITY (FLUX CORRECTION BOUNDARY
CONDITION)E,P Are provided by the ECMWF
and JAEGERS Climatologies respectively C2
0.7 m / dS SSS as provided by the MODB-MED4
Seasonal ClimatologyKm andKh are provided by
the Mellor-Yamada turbulence closure scheme.
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Model grid (1/20oX1/20o) and model topography
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Temperatures at 10m
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Salinities at 10m
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OGCM (LEFT) AND ALERMO (RIGHT) FOR WINTER
(UPPER) AND SUMMER (LOWER)
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Flow field at 10m
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Temperatures at 300m
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Salinities at 300m
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Flow field at 300m
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SST Image (Dec 1994) showing Ierapetra and Rhodes
Gyres
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GENERATION AND POSITIONING OF IERAPETRA GYRE
(SKiRON ATMOSPHERIC DATA JULY SEPT 1999 1/10 x
1/10)
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SKIRON (UPPER) VERSUS ECMWF FORCING
(LOWER)SKIRON 1/10 x 1/10ECMWF ½ x ½
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a) ECMWF ATMOSPHERIC FORCING WITH
SKIRON WINDSb) ECMWF ATMOSPHERIC FORCING
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Temperatures at 10m
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Salinities at 10m
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From Kourafalou and Barbopoulos (2002)
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Flow field at 10 m
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From Kourafalou and Barbopoulos (2002)
SUMMER SEASON Salinity (surface). The plume
associated with BSW outflow is strongest,
depicting an intense anticyclonic bulge in the
vicinity of the Dardanelles and a secondary
anticyclonic bulge immediately south. The BSW
waters exhibit a wider range of pathways as
compared to the previous seasons. A strong
tendency for northeastward transport can be seen,
that is responsible for the evident freshening of
a large portion of the north part of the domain.
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Temperatures at 300 m
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Salinities at 300 m
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Densities (s?) at 300 m
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Densities (s?) at models bottom sigma layer
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ALERMO OPERATIONAL SYSTEM SETUP

• -PRINCETON OCEAN MODEL
• MEDITERRANEAN IMPLEMENTATION (1/4 x 1/4)
• ALERMO EASTERN MEDITERRANEAN IMPLEMENTATION
  (1/20 x 1/20)
• -GLOBAL MEDITERRANEAN MODEL (1/4 x 1/4) PROVIDES
  OPEN BOUNDARY CONDITIONS TO ALERMO (ONE-WAY
  NESTING)
• - MOMENTUM, HEAT(DOWNWARD) AND FRESHWATER FLUXES
  AT THE SURFACE ARE PROVIDED BY THE SKYRON
  FORECAST SYSTEM (1/5 x 1/5) FOR BOTH MODELS

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ALERMO OPERATIONAL SYSTEM
FORECAST PERIOD 25/09/02
600 UTC 27/09/02 1200 UTC
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WAVE FORECASTS
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MEDITERRANEAN AND AEGEAN SEA APPLICATIONS (TRITON
WAVE FORECAST SYSTEM www.oc.phys.uoa.gr)

• GLOBAL WAVE FORECAST MODEL (1 x 1)
• MEDITERRANEAN BLACK SEA MODEL (OPERATIONAL)
  ISSUES 66 HOURS FORECAST) (1/5 x 1/5 RESOLUTION)
• THE SAME MODEL HAS BEEN USED FOR WAVE CLIMATE
  STUDIES (1979 1993 ECMWF REANALYSIS DATA)
• AEGEAN AND IONIAN SEA WAVE MODEL (1/10 x 1/10 -
  WAM)
• NORTH AEGEAN , SOUTH AEGEAN AND CYCLADES AREA
  WAVE MODELS (1/30 x 1/30 - WAM)
• CRETAN SEA, IONIAN SEA, SARONIKOS BAY WAVE MODELS
  (1/60 x 1/60 - SWAN)
• SARONIKOS COASTAL AREA AND EASTERN ATTIKA COASTS
  WAVE MODELS (1/180 x 1/180) (SWAN)

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TRITON WAVE FORECAST SYSTEM
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TRITON WAVE FORECAST SYSTEM
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TRITON GLOBAL WAVE
FORECASTNCEP GLOBAL ATMOSPHERIC DATA (1.25 x 1)
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ENVIWAVE PROJECT (INDIAN OCEAN NCEP GLOBAL
ATMOSPHERIC DATA)
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ENVIWAVE PROJECT (EASTERN MEDITERRANEAN SKYRON
ATMOSPHERIC DATA)