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MODIS Science Team Mtg
Simultaneous retrieval of Aerosol and Simultaneous retrieval of Aerosol and Chlorophyll from MODIS Aqua radiancesChlorophyll from MODIS Aqua radiances
Clark Weaver Clark Weaver GEST UMBC NASA Goddard GEST UMBC NASA GoddardArlindo da Silva Arlindo da Silva GMAO GMAO
Radiative TransferRadiative TransferDave FlitnerDave Flitner Zia AhmadZia Ahmad
ChlorophyllChlorophyllWatson GreggWatson Gregg
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MODIS Science Team Mtg
IntroductionIntroductionGoalGoal: : Construct algorithm that simultaneously retrieves Construct algorithm that simultaneously retrieves
Aerosol and Ocean Chlorophyll. Aerosol and Ocean Chlorophyll. Simulates observed MODIS radiances Simulates observed MODIS radiances
Observations, ReflectancesObservations, Reflectances 7 MODIS-Aqua level-2 channels (0.47 - 2.1um )7 MODIS-Aqua level-2 channels (0.47 - 2.1um )2 Additional level-1b (0.412, 0.443, 0.488) 2 Additional level-1b (0.412, 0.443, 0.488)
Forward ModelForward Model● Aerosol 3D Transport MODEL (GOCART) providesAerosol 3D Transport MODEL (GOCART) provides
spatial and size distribution of aerosolsspatial and size distribution of aerosols
3D Ocean Biogeochemical model provides first guess 3D Ocean Biogeochemical model provides first guess chlorophyll concentrations (Watson Gregg)chlorophyll concentrations (Watson Gregg)
● Herman Radiative Transfer Model (Vector Code) Herman Radiative Transfer Model (Vector Code) converts aerosol chlorophyll concentrations to reflectanceconverts aerosol chlorophyll concentrations to reflectance
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MODIS Science Team Mtg
MotivationMotivation
Desire to retrieve absorbing aerosol information Desire to retrieve absorbing aerosol information over Ocean using MODIS Radiancesover Ocean using MODIS Radiances
Need to account for chlorophyll absorptionNeed to account for chlorophyll absorption
Approach: Use model based retrieval to useApproach: Use model based retrieval to useIn Assimilation SystemIn Assimilation System
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MODIS Science Team Mtg
First guess 3D aerosolFirst guess 3D aerosolconcentrations ofconcentrations of
Aerosol and ChlorophyllAerosol and Chlorophyll
First Guess ReflectanceFirst Guess Reflectance
Aerosol Aerosol OpticalOptical
ParametersParameters
First guess Aerosol andFirst guess Aerosol andChlorophyllChlorophyll
Retrieved Aerosol andRetrieved Aerosol andChlorophyllChlorophyll
Analysis 3D aerosolAnalysis 3D aerosolAAnd chlorophyll nd chlorophyll concentrationsconcentrations
GOCARTGOCART
wwff
RETRIEVALRETRIEVALAdjust aerosol and chlorophyllAdjust aerosol and chlorophyll
MODIS ObservedMODIS ObservedLevel 2 and 1bLevel 2 and 1b
Reflectance Reflectance ρρoo
wwaa
RT Forward ModelRT Forward Model
ρρaa
ρρff
RT Forward ModelRT Forward Model
Biogeochemical Biogeochemical Ocean ModelOcean Model
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MODIS Science Team Mtg
Many look-up-tables per MODIS channel generatedMany look-up-tables per MODIS channel generatedby the University of Arizona radiative transfer modelby the University of Arizona radiative transfer model
Variants: Variants: Aerosol species, Relative humidity Aerosol species, Relative humidity SpeciesSpecies
Dust (dry RDust (dry R
eff eff = 1.0, 1.4 = 1.0, 1.4 µm) µm) Seasalt (dry Seasalt (dry RReff eff = 1.0, 1.3 µm) = 1.0, 1.3 µm)
Sulfate Sulfate Black Carbon-Organic Black Carbon-Organic Carbon mixturesCarbon mixtures
Variant: Variant: ChlorophyllChlorophyll Spectral Absorption from Morel and Maritorena (2001)Spectral Absorption from Morel and Maritorena (2001)
Variants: Variants: Underlying Surface PropertiesUnderlying Surface PropertiesRough Ocean (2, 6, 12 Rough Ocean (2, 6, 12 m/s wind speedsm/s wind speeds
Ocean wind speed is from GMAO meteorological assimilationOcean wind speed is from GMAO meteorological assimilation
Radiative Transfer Forward modelRadiative Transfer Forward model
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MODIS Science Team Mtg
Observed RadianceObserved Radiance
Analysis Chlorophyll Analysis Chlorophyll Radiance termRadiance term
Total AnalysisTotal AnalysisRadiance termRadiance term
mg /m3mg /m3
mg /m3mg /m3
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MODIS Science Team Mtg
Low Chlorophyll - Low aerosolLow Chlorophyll - Low aerosol
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MODIS Science Team Mtg
High Chlorophyll - High aerosolHigh Chlorophyll - High aerosol
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MODIS Science Team Mtg
Low ChlorophyllLow ChlorophyllModerate aerosol Moderate aerosol
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MODIS Science Team Mtg
High Chlorophyll - High aerosolHigh Chlorophyll - High aerosol
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MODIS Science Team Mtg
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MODIS Science Team Mtg
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MODIS Science Team Mtg
How well can we simulate the observe radiances?How well can we simulate the observe radiances?
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MODIS Science Team Mtg
How well can we simulate the observe radiances?
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MODIS Science Team Mtg
Is the Analysis remembering the First Guess species distribution ?Is the Analysis remembering the First Guess species distribution ?
Black CarbonBlack Carbon Organic CarbonOrganic Carbon
Black CarbonBlack Carbon Organic CarbonOrganic Carbon
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MODIS Science Team Mtg
SulfateSulfate DustDust
Is the Analysis remembering the First Guess species distribution ?Is the Analysis remembering the First Guess species distribution ?
Sulfate Sulfate Dust Dust
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MODIS Science Team Mtg
Sea saltSea salt
Sea saltSea salt
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MODIS Science Team Mtg
High AODHigh AODSolid Solid chlorophyll = 0.04 mg/m3chlorophyll = 0.04 mg/m3DashedDashed chlorophyll = 0.20 mg/m3chlorophyll = 0.20 mg/m3
Low ChlorophyllLow Chlorophyll
High ChlorophyllHigh Chlorophyll
SSA=0.71SSA=0.71
SSA=0.95SSA=0.95
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MODIS Science Team Mtg
High AODHigh AOD
Moderate AODModerate AOD
Solid Solid chlorophyll = 0.04 mg/m3chlorophyll = 0.04 mg/m3DashedDashed chlorophyll = 0.20 mg/m3chlorophyll = 0.20 mg/m3
Low ChlorophyllLow Chlorophyll
High ChlorophyllHigh Chlorophyll
SSA=0.71SSA=0.71
SSA=0.95SSA=0.95
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MODIS Science Team Mtg
Current DirectionsCurrent Directions
Developing Look-up-tables for absorbing aerosol and chlorophyllDeveloping Look-up-tables for absorbing aerosol and chlorophyll
Chlorophyll=0.1 Absorbing AOD=0.1 Chlorophyll=0.1 Absorbing AOD=0.1 Chlorophyll=0.1 Chlorophyll=0.1 ++ Absorbing AOD=0.1 Absorbing AOD=0.1
Neural networks to replace Look-up-tablesNeural networks to replace Look-up-tables
Model base retrieval algorithm Model base retrieval algorithm
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MODIS Science Team Mtg
Chlorophyll (simulated) from Biogeochemical model Chlorophyll (simulated) from Biogeochemical model 1 September 20011 September 2001
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MODIS Science Team Mtg