Multidecadal Ocean Reanalysis: from the Global to the Mediterranean view

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Multidecadal Ocean Re-analysis from the Global
to the Mediterraneanview

• Simona Masina1,2 and Mario Adani1
• 1Istituto Nazionale Geofisica e Vulcanologia
  (INGV)
• 2Centro Euro-Mediterraneo per i Cambiamenti
  Climatici (CMCC)

CMCC Workshop Ugento, 10-12 June 2009
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• Outline
• Motivations
• CMCC/INGV Assimilation System for the Global
  Ocean
• Examples of global ocean analyses used for
• studies of inter-annual and decadal ocean
  variability
• estimation of coupled model performances
• initialization of seasonal forecast.
• Ongoing activities and near future plans

• CMCC/INGV Assimilation System for the
  Mediterranean Sea
• Results
• Conclusions/Future Work

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• Motivations
• Provide regularly gridded and dynamically
  consistent analyses for diagnostic studies of
  past climate variability at different time scales
  (from seasonal to decadal).
• Provide a validation data set for models.
• Provide an optimal initial state of the oceanic
  component of a coupled model for seasonal and
  lower frequency forecast.
• Provide the boundary conditions for higher
  resolution regional models

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The Ocean Data Assimilation System
The observation system
Assimilation Scheme
Global Analysis
General Ocean Circulation Model
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The global ocean observing system for climate
August 2006
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Total in situ networks
57
100
42
81
83
43
66
48
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Courtesy of A. Fischer
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Global Ocean Data Assimilation at CMCC-INGV
In Situ Data WOD05,WOCE, ARGO,etc. (Temperature
and Salinity)
Forcing ERA40 daily fluxes and operational
after 2002
Assimilation scheme ROOI (De Mey and
Benkiran,2002) EOFs Vertical T/S bivariate
from Model (Bellucci et al. 2007)
OGCM OPA8.2/ORCA2 (Madec et al.1998)
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The historical record of OHC
Application past climate variability
Approx. 14.5 x 1022 J between 1955 1998 0.2
W/m2
from Levitus et al., JGR, 2005
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Application validation data set
T106 T30
Hovmoller diagrams of heat content for El Nino
composites
15-20N
ANALYSIS
COUPLED MODELS
10-15N
Kelvin wave is too fast in the T30 model
5S-5N
Navarra et al., 2008
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Application validation data set
TWO ANALYSES
2 LEADING EOFs OF THERMOCLINE DEPTH IN THE
TROPICAL PACIFIC OCEAN
COUPLED MODELS
Capotondi et al., 2006
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Application initial/boundary conditions
ENSO Prediction Skill Control vs IC-Sens
Black - Control Red - IC-Sens Green filled
circles OBS
Tomorrow talk by A. Alessandri
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The Future of Global Ocean Data Assimilation at
CMCC-INGV
In Situ Data WOD05,WOCE,etc. (Temperature and
Salinity)
Forcing ERA40 daily fluxes
OGCM NEMO ORCA0.25
OGCM ORCA2
3D-Var Dobricic Pinardi, 2008
ROOI scheme
EOFs Vertical from Model
See tomorrow talk
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• Regional Re-analysis
• Mediterranean Sea re-analysis
• 1985-2007

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INGV/CMCC Regional Reanalysis Systems
Atmospheric and hydrological forcing ? ECMWF
operational analysis ERA15 ? Monthly mean
climatological NCEP precipitation ? Monthly mean
climatological river runoff (GRDC)
Daily Mean output ? Temperature ? Salinity ?
Velocities ? Wind Stress ? Sea Surface Height ?
Heat Flux ? Water Flux ? Shortwave Radiation
Ocean General Circulation Model OPA code
resolution 1/16 x 1/16 and 71 unevenly spaced
levels

• Assimilation schemes
• 3DVAR (Dobricic Pinardi, 2008)
• ROOI-SOFA (Benkiran De Mey, 2002)

Assimilation schemes RELAXATION

Observations ? T/S in situ profiles ( MedATLAS
Mailard et al. 2003 MFS) ? SLA ( Pujol et al.
2005 )
Observations SST (Marullo et. al 2007)
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In situ data
The Med-Sea observation system
Satellite data
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Reanalysis
Simulation
Results
rmse SLA m
rmse temperature degC
rmse salinity psu
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Results Near Future Application
A comprehensive set of data, describing the
physical state of the ocean has been produced,
and is available to assess the consequences of
climate change for human society and marine
ecosystems in the Mediterranean environment (as
part of the CIRCE project or any other similar
activities).
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Future Work
Atmospheric and hydrological forcing ? ECMWF
ERA40 Operational analysis ? Monthly mean
climatological CMAP precipitation ? Monthly mean
climatological river runoff (GRDC)
Daily Mean output ? Temperature ? Salinity ?
Velocities ? Wind Stress ? Sea Surface Height ?
Heat Flux ? Water Flux ? Shortwave Radiation
Ocean General Circulation Model NEMO code
resolution 1/16 x 1/16 and 71 unevenly spaced
levels

• Assimilation schemes
• 3DVAR (Dobricic Pinardi, 2008)

Observations ? T/S in situ profiles Gliders ?
SLA ? Drifters ARGO trajectories ? SST
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All the data sets will be available on the CMCC
Data Distribution Center as soon as possible for

• dataset search and discovery
• dataset download
• dataset access via OPeNDAP
• dataset subsetting through Netcdf-Subset Service
  
• dataset visualization via Integrated Data Viewer
  and Godiva2 web interface (including support for
  Google Earth).