Including Atmospheric Aerosols in the pCRTM

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Including Atmospheric Aerosols  in the pCRTM

• NOAA/NASA Joint Center for Satellite Data
  Assimilation
• April 2005
• Clark Weaver
• Atmospheric Chemistry and Dynamics Branch NASA /
  GSFC
• GEST/ University Maryland Baltimore County

Collaborators Paul Ginoux Peter
Colarco Alrindo da Silva Joanna Joiner Paul
van Delst
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Goal

• Account for effect of Absorption and Scattering
  of Atmospheric Aerosols (Dust) in pCRTM
• Determine impact on
• 1) pCRTM calculated Brightness Temperatures
• 2) retrieved Atmospheric temperatures and water
  vapour amounts
• Use pCRTM (with Aerosol Modules) in Forecast
• Impact on Observed minus First guess Satellite
  Brightness Temperatures ??

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T dust
FG
FG
Observed Tb f ( Tocean,Tdust )
First Guess Tb f (Tocean)
Usually Tdust lt Tocean O- F Tb lt 0
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FG
T dust
T dust
T dust
3D Model Dust Fields
FG
FG
FG
Observed Tb f ( Tocean, Tdust )
First Guess Tb f (Tocean, Tdust )
Accounting for dust absorption and scattering in
TOVS retrieval system
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Forecasted 3D Dust fields Temperature,
Moisture from GMAO FvGCM (offline transport
model run with assimilated meteorology)
Aerosol Coefficients Absorption Scattering
(single)
pCRTM
Brightness Temperatures
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Two Options for Forecasted 3D Dust fields
Global Modeling and Assimilation Office (GMAO)
Finite volume General Circulation Model
(FvGCM) Winds and Temperatures are assimilated
and used to drive offline Aerosol transport
model Dust Size distribution information (5
bins) Not yet in production mode Almost Real-time

Navy Aerosol and Analysis Prediction System
(NAAPS) Forecast Winds and Temperatures used to
drive offline Aerosol transport model No Dust
Size distribution information Production mode 120
hr forecasts
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April 13, 2005 00Z
GMAO FvGCM
0.8
MODIS Optical Depth
0.6
0.5
0.3
0.2
0.0
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14 um 600mb Temperature sounding
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13.4 um 900mb Temperature sounding
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11.1 um Surface Temperature
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12.56 um Water vapor 900mb
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4.52 um temperature 950mb
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4.00 um Surface temperature
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• Completed
• Developed code to generate Aerosol Extinction and
  Scattering Coefficients for HIRS and AMSU
  satellites
• Developed version of pCRTM that accounts for
  Aerosol radiative effects.
• Current
• Testing out two options for 3D model dust fields.
• Investigate if dust size distribution information
  is needed.