New Products from combined MODISAIRS

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New Products from combined MODIS/AIRS   Jun Li,
Chian-Yi Liu, Allen Huang, Xuebao Wu, and Liam
Gumley   Cooperative Institute for
Meteorological Satellite Studies Space Science
and Engineering Center University of
Wisconsin-Madison 1225 West Dayton Street,
Madison, Wisconsin
International EOS/NPP Direct Readout Meeting, 3
6 October 2005 Benevento, Italy
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New products for IMAPP from combined MODIS/AIRS

• MODIS classification mask
• AIRS sub-pixel cloud detection products using
  MODIS data (Li et al. 2004a -JAM)
• Single FOV Cloud/Aerosol property products from
  AIRS radiances (Li et al. 2004b - JAM 2005a -
  JAM) with the help of MODIS (cloud mask, cloud
  phase mask, cloud classification mask, etc.)
• AIRS cloud-clearing radiance products using
  multi-band MODIS clear radiances (Li et al. 2005b
  IEEE TGARS)

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• AIRS sub-pixel cloud detection and
  characterization using MODIS (Li et al. 2004a -
  JAM).
• Use MODIS cloud mask (1 km) for AIRS single
  field-of-view (SFOV) clear mask
• Use MODIS cloud phase mask (1 km) for AIRS SFOV
  cloud phase mask
• Use MODIS cloud classification mask (1 km) for
  AIRS SFOV cloud classification mask

Aqua MODIS RGB Natural Color 17 September 2003
Hurricane Isabel
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AIRS clear coverage
Clear
Cloudy
MODIS confident clear pixels are counted for AIRS
clear coverage !
MODIS 1 km cloud mask
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Unknown Mixed Phase Ice Clouds Water
Clouds Clear
AIRS cloud phase mask with 13.5 km resolution
(mixed phase clouds appear frequently !)
MODIS cloud phase mask with 1 km spatial
resolution
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F3 F2 F1
AIRS Window BT(K)
Water Land L. Cld Mid Cld L.
Cld H. Cld H. Cld Mid Cld Mid.
Cld
MODIS 1km classification mask superimposed to the
AIRS footprints of the study area. The MODIS
classification mask gives the cloud layer
information with each AIRS footprint.
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• Cloud property products from AIRS radiances (Li
  et al. 2004b - JAM 2005a - JAM) with help of
  MODIS
• MODIS cloud mask is used for AIRS SFOV
  clear/cloudy detection
• MODIS cloud phase mask is used for AIRS SFOV
  phase determination
• Cloud properties are retrieved from from AIRS
  radiances with a physical algorithm (Minimum
  Residual Method)

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F1 Thick ice clouds
1km MODIS classification mask superimposed to
AIRS footprints
AIRS BT(K) _at_ 901.69 cm-1
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F1 CTP258, CPS33.90, COT1.62
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AIRS window BT image over North America region
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AIRS cloud-top pressure retrieval with help of
MODIS cloud mask
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AIRS cloud optical thickness retrieval with help
of MODIS cloud mask and cloud phase mask
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Validation of cloud properties

• Compare with MODIS natural color image
• Compare with MODIS classification results
• Ground measurements
• Lidar observation

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MODIS/AIRS
Spatial resolution MODIS CTP 5 km AIRS CTP
13.5 km GOES CTP 10 km
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MPACE Mixed Phase Artic Cloud Experiment Granule
223, 17 October 2004
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AIRS OD1.44
Vertical Layers
AIRS Effective Radius38.6 um
AIRS time 221732 UTC
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Desert Vs Dust aerosol
Dust
Desert
MODIS (BT11 - BT12)
AIRS window BT
MODIS Natural color
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Derive AIRS cloud-cleared radiances using
MODIS/AIRS cloud-clearing algorithm

• MODIS multi-spectral IR clear radiances within
  AIRS sub-pixel are used for AIRS cloud-clearing
  on SFOV basis (Li et al. 2005b, IEEE-TGARS)
• MODIS clear radiances within AIRS sub-pixel are
  used for Quality Control (QC) on AIRS
  cloud-clearing

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Aqua MODIS IR SRF Overlay on AIRS Spectrum
Direct spectral relationship between IR MODIS and
AIRS provides unique application of MODIS in AIRS
cloud_clearing !
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Optimal imager/sounder cloud-clearing
Methodology (Li et al. 2005 IEEE Trans. On
Geoscience and Remote sensing, June issue).

• CCR is obtained on single footprint basis (3 by 3
  box moves by single footprint
• MODIS clear radiances are used for QC

N is solved from 9 MODIS band (22, 24, 25, 28,
30, 31, 32, 33, 34) are used
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AIRS clear (13.5 km)
AIRS clear CC-S (13.5 km)
MODIS clear (1 km)
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AIRS single FOV profile retrieval versus ECMWF
analysis
Water Vapor Mixing Ratio
Temperature
Clear neighbor
Cloud contaminated
Cloud-cleared
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Temperature RMS difference between AIRS and
ECMWF 250 thin cloud FOVs
Contaminated by thin clouds !!
Clear Neighbor
Cloud-cleared (MODIS/AIRS)
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Summary

• There are potential new products from combined
  MODIS/AIRS, especially the SFOV cloud property
  products that include AIRS cloud mask, cloud
  phase mask, cloud layer information mask, etc.
• AIRS SFOV cloud-cleared radiances will be derived
  using MODIS/AIRS cloud-clearing approach.
• Efforts are also on deriving AIRS SFOV sounding
  products under both clear and cloudy skies with
  help of existing MODIS products.