1. Extending MICROS to include Solar Reflectance Bands (SRB)
Sasha Ignatov1 and Xingming Liang1,2
1NOAA/NESDIS/STAR 2CSU/CIRA
GSICS Annual Meeting, Beijing, 5-8 March 2012
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2. M-O in Earth Emission Bands (EEB)
M-O biases in MICROS
“M” - model BTs
Generated by CRTM w/ first guess SST and GFS profile as input
No aerosols included in EEBs
“O”- Clear-sky sensor ocean Radiances
Clear-Sky BTs generated using ACSPO Cloud Mask and QC
Generate double differences (DDs) to check cross- platform consistency
“M” serves as a ‘Transfer Standard’
DDs cancel out/minimize effect of systematic errors & instabilities in BTs
GSICS Annual Meeting, Beijing, 5-8 March 2012
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3. M-O in Solar Reflectance Bands (SRB)
M-O biases in MICROS
“M” - model BTs
No CRTM simulations available in Solar Reflectance Bands (SRB)
“O”- Clear-sky sensor ocean Radiances
Clear-sky reflectances available in SRBs using the same Cloud Mask and QC
Once M is available in SRBs, double differences DDs can be also calculated
“M” serves as a ‘Transfer Standard’
DDs cancel out/minimize effect of systematic errors & instabilities in BTs
How to calculate the “M” in Solar Bands?
GSICS Annual Meeting, Beijing, 5-8 March 2012
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4. “M” in Solar Reflectance Bands (SRB)
Atmosphere – major signal in SRBs
3D Aerosol fields
Gaseous absorption, Rayleigh(pressure) - GFS
Surface reflectance – minor signal in SRBs
Fresnel reflectance
Water-leaving radiance (nLw): small & constant at λ>0.6 µm
nLw needed at λ<0.6 μm – product of ocean color community
Remaining errors in nLw will cancelled out in calculation DDs
CRTM v2.0
Includes scattering and can work in SRBs
Inefficient (slow) – under optimization
GSICS Annual Meeting, Beijing, 5-8 March 2012
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5. 3D Aerosol Fields inputs into CRTM
The Goddard Chemistry Aerosol Radiation and Transport (GOCART) – Working with
NASA GSFC Radiation Branch - Mian Chin
NASA GSFC Global Model Assimilation Office (GMAO) – A. da Silva, P. Colarco
NOAA NCEP – S. Lu
Navy Aerosol Analysis and Prediction System (NAAPS) – Working with
Naval Research Lab (NRL) – E. Hyer, D. Westphal
University of N. Dakota (UND) – J. Zhang
CRTM Team – Working with
JCSDA – F. Weng, Y. Han, Q. Liu, Y. Chen, P. Van Delst
GSICS Annual Meeting, Beijing, 5-8 March 2012
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6. Aerosol Quality Monitor (AQUAM)
AQUAM established to check for consistency between satellite and model Aerosol Optical Depths (AOD)
Available in AQUAM: 5 AVHRRs, 2 MODIS, AERONET
Under testing: GOCART/CRTM, NAAPS/CRTM
GSICS Annual Meeting, Beijing, 5-8 March 2012
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7. GSICS Annual Meeting, Beijing, 5-8 March 2012
Future Work
AQUAM - Achieve Consistency between satellite, model and ground truth AODs
Satellite – AVHRR, MODIS
Model – GOCART/CRTM, NAAPS/CRTM
Ground Truth – Aerosol Robotic Network (AERONET)
Simulate TOA reflectances in SRBs and achieve consistency with satellite reflectances
Calculate M-O biases in SRBs and Double Differences  add in MICROS
Incorporate aerosol in CRTM for EEBs, improve Double Differences in EEBs  add in MICROS
GSICS Annual Meeting, Beijing, 5-8 March 2012
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