toward coupled data assimilation in nasa’s geos: developments … · 2020-02-26 · global...
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Global Modeling and Assimilation Officegmao.gsfc.nasa.gov
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Toward coupled data assimilation in NASA’s GEOS: Developments in the ocean context
Rahul Mahajan1, Ron Gelaro1, Guillaume Vernieres2, Travis Sluka2
1NASA/GMAO2JCSDA/UCAR
Eighth AMS Symposium on the Joint Center for Satellite Data Assimilation; 100th AMS Annual Meeting, Boston, Massachusetts, 14 January, 2020
https://ntrs.nasa.gov/search.jsp?R=20200001041 2020-04-12T11:50:13+00:00Z
Global Modeling and Assimilation Officegmao.gsfc.nasa.gov
National Aeronautics and Space Administration
GEOS Unified CDASJEDI-based
MERRA-2 Ocean Product
• NWP• Reanalysis• S2S Prediction
New ConvectionEnKF SPPTNew LSM
2019
S2S v2MOM5 0.5o L40
CICE4UMD LETKF
2017
S2S v3MOM5 0.25o L50
Salinity
2020
Hybrid 4D-EnVar13-km L72Aerosols
AO Skin SST
2017
S2S v4GEOS+JEDI
2022
2018
GMI All-Sky Radiances Updated Radiation
JEDI ODASMOM6 L72
Hybrid EnVar
2020
2024
132 LevelsNew MicrophysicsAdded All-Sky MW
2020
9-km GridNonhydrostatic
Moving toward a JEDI-based GEOS system for coupled DA
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Global Modeling and Assimilation Officegmao.gsfc.nasa.gov
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IAU Data AtmoAtmosphere Ocean
ChemTurbGWDMoist
GoCartGoC Data MAM CARMA
CAP
GCSExt Data History
GCM Analysis
Atm Ana Ocn Ana
Data Ocn
MOMCICE Data Ice
ORadOBio
WaveDynamicsPhysics
FVFV3PerFV3DataDyn Aries
ECCOH AChemTRGAAS
GMI StrChemGeosChemPChem
GEOS Earth System Model
RAD
SW LW
Sfc
Lake Land Salt LandIce
Veg Catch
A configurable system that leverages the hierarchical nature of the Earth System Modeling Framework
Global Modeling and Assimilation Officegmao.gsfc.nasa.gov
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IAU Atmosphere Ocean
ChemTurbGWDMoist
GoCart
CAP
GCM Analysis
Atm Ana
Data Ocn
Data IceDynamicsPhysics
FV3
GAAS
PChem
RAD
SW LW
Sfc
Lake Land Salt LandIce
Veg Catch
GEOS NWP
● Atmos GCM● Atmos H4D-EnVar● Data Ocean● Aerosol DA
GCSExt Data History
Global Modeling and Assimilation Officegmao.gsfc.nasa.gov
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IAU Atmosphere Ocean
ChemTurbGWDMoist
GoCart
CAP
GCM Analysis
DynamicsPhysics
FV3
PChem
RAD
SW LW
Sfc
Lake Land Salt LandIce
Veg Catch
Ocn Ana
MOM5CICE
TR
GEOS S2S
● Coupled GCM● Ocean LETKF● Atmos Replay● Aerosol Transport
GCSExt Data History
Global Modeling and Assimilation Officegmao.gsfc.nasa.gov
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GEOSDisparate data
assimilation systems
Up to now GMAO’s data assimilation systems have been developed for individual GEOS components as disparate entities.
GEOS+JEDIGeneric dataassimilation algorithms
Atmosphere Aerosol
Constituent
Ocean
Land
Sea Ice
AtmosphereH4DEnVar
AerosolPSAS
Constituent3DVar
OceanLETKF
LandEnKF
Sea Ice
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Building a GEOS unified data assimilation system
Global Modeling and Assimilation Officegmao.gsfc.nasa.gov
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Data Atmo Ocean
CAP
GCM
JEDI
MOM6
GEOS+JEDI ODAS
● Ocean GCM● JEDI DA● Data Atmos
Ocn Ana
GCSExt Data History
Global Modeling and Assimilation Officegmao.gsfc.nasa.gov
National Aeronautics and Space Administration
Not a toy system...
• GFDL MOM6 at 1o L72• Full suite of observations• 24-h assimilation window• JEDI-SOCA 3D-Var
• Balance operators for variable transforms• Vertical correlations parameterized based
on model mixed layer depth• Horizontal correlations using B-Matrix on
an Unstructured Mesh Package (BUMP)• 1 Nov 2015 – 30 April 2016
Experimental setup
Also...
• Two sets of atmospheric forcings:• CFSR• MERRA-2
• Two sets of observations:• NCEPobs (HGODAS)• GMAOobs (GEOS S2S)
(GMAOobs do not include satellite SST)
Global Modeling and Assimilation Officegmao.gsfc.nasa.gov
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SalinitySMAP
AltimetryJason-2/-3, Sentinel-3a, Cryosat-2, SARAL
SST (IR)AVHRR (Metop-A, NOAA 19) VIIRS (SNPP)
SST (MW)GMI, AMSR-2, WindSat
486,923337,773458,88693,157
240,0171,616,756
SST (IR) -SST (MW) -
Salinity -Ice Fraction -
Altimetry -
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Sample observation counts in a 24-h assimilation window
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CFSR / NCEPobsCFSR / GMAOobsMERRA2 / NCEPobsMERRA2 / GMAOobs
Days
ADT rms departures
O-F
O-A
Assimilation sanity check
m
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Departure differences between MERRA2 / NCEPobs and CFSR / NCEPobs
Atmospheric forcing effects
Difference in SST rms O-F Difference in SST rms O-A
Red shades imply MERRA2 forcing drives the SST away from the observations compared with CFSR forcing, which is reduced somewhat after the assimilation.
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Departure differences between MERRA2 / GMAOobs and CFSR / GMAOobs
Atmospheric forcing effects
Difference in Temp rms O-F Difference in Salinity rms O-F
Temperature error with MERRA2 forcing grows with time and shows some deepening; Salinity error shows no obvious trend.
Dep
th (m
)
Days Days
K PSU
Global Modeling and Assimilation Officegmao.gsfc.nasa.gov
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Animation of SSH: 2 panels TBD
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o A key component of JEDI is the Unified Forward Operator (UFO), which introduces standard interfaces for observation operators that link the model and observation worlds.
o The UFO accommodates the assimilation of observations for coupled or uncoupled models in an analogous (unified) manner.
Uncoupled Ocean Only
SSTo
ObservationOperator
ObservationSSTo
ModelState
MOM6SST
SSTi,jSimulated
Observation
Coupled Ocean-Atmosphere
TBo
ObservationOperator
ObservationTBoSST,T,q
SimulatedObservation
ModelState
MOM6
ModelStateFV3
SSTi,jTi,j,k,qi,j,k
GEOS
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Future work