AIRS Level 2 Processing and Distribution Plans

1
AIRS Level 2 Processing and Distribution Plans

• W. Wolf(1), M. Goldberg(2), C. Barnet (2),
• L. Zhou(1), and T. King(1)
• (1) QSS Group Inc, Lanham, MD, USA
• (2) NOAA-NESDIS, Camp Springs, MD, USA

2
AIRS Operations

• Fully Operational
• 24/7 Support
• Full backup system not yet

3
Current Distribution Status

• BUFR and HDF Subset Files
• AIRS Level 1B HDF-EOS Files
• Daily Global Grids

4
NWP Customers

• NCEP
• DAO
• CMC
• JMA
• FNMOC
• Bureau of Meteorology Research Centre (Australia)

• UK-Met Office
• ECMWF
• Meteo-France
• DWD

5
Subset Files (per day)

• BUFR radiance subset files
• 281 channels (one fov) 240 Mb
• 324 channels (one fov) 360 Mb
• 324 channel (nine fovs) 1.2 Gb
• Principal components (one fov) 720 Mb
• Reconstructed Radiances (324 ch, one fov) 360
  Mb
• AMSU only (full resolution) 24 Mb
• HDF radiance subset file
• 281 channel (9 fovs) 5.3 Gb

6
HDF-EOS Files

• Full resolution Visible Data 4 Gb
• CONUS AIRS Data 10 Gb
• Every 10th AMSU Granule
• Level 0 (non HDF) 14 Mb (compressed)
• Level 1A 12 Mb (compressed)
• Level 1B 12 Mb (compressed)

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Global Grids

• All Channels (one fov) 2.5 Gb
• All Channels (nine fov) 1.7 Gb
• Forecast Models 1.3 Gb
• Level 2 (Cloud Cleared and Products) 2 Gb

8
Special Cases

• Hurricanes (BUFR) 1 Gb
• Fires (HDF-EOS) 1 Gb
• Aerose (HDF-EOS) 100 Gb
• Full Resolution Microwave Data since July 2002 to
  MIT 62 Gb

9
Distribution Numbers

• BUFR and HDF -- 8 Gb / day
• HDF-EOS -- 14 Gb / day
• Grids -- 7 Gb / day
• Matchups -- 130 Mb / day
• Special Cases -- 165 Gb

10
Level 2 Distribution

• Cloud Cleared Radiance in BUFR format
• Level 2 Products in BUFR format
• Matchups

11
Cloud Cleared BUFR Files

• Use the same format as the Level 1B subset BUFR
  files
• Everything is the same except for the Quality
  Flag information
• Need to able to accurately quality flag the cloud
  cleared radiances for distribution

12
Quality Flags for CC BUFR File

• 1 --  No good blackbody counts for scan line
• 2 --  No good space view counts for this line
• 3 --  No good PRTs for this line
• 4 --  Some bad blackbody view counts for this
  line
• 5 --  Some bad space view counts for this line
• 6 --  Some bad PRT temps on this line
• 7 --  Blackbody counts could not be smoothed
• 8 --  Spaceview counts could not be smoothed

13
Quality Flags for CC BUFR File

• 9  -- Scanline was calibrated, but the moon was
  in the space view
• 10 --  The channel was calibrated , but there was
  a space view scan
• position error
• 11 --  The channel was calibrated, but there was
  a blackbody scan
• position error
• 12 --  The scanline was calibrated, but there was
  a data gap
• 13 --  Some channels were not calibrated
• 14 --  Excessive NeDT Estimate
• 15 --  Most recent calibration coefficients were
  used
• 16 --  The instrument was not in science mode

14
Quality Flags for CC BUFR File

• 17 --  High Noise in Channel
• 18 --  Bad Telemetry
• 19 --  Pop Detected in Channel
• 20 --  Bad Gain for Channel
• 21 --  Bad Offset for Channel
• 22 --  Undesirable Channel Properties (Bad
  Channel)
• 23 Reconstructed Radiance Flag
• 24 All Set, Missing value

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Level 2 Products BUFR File

• Air Temperature (100 levels) Rain Rate
• Layer Column Liquid Water (100 layers) Total
  Water
• Layer Column Water Vapor (100 layers) Total
  Ozone
• Layer Column Carbon Monoxide (100 layers) Surface
  Air Temperature
• Layer Column Methane (100 layers) Surface Skin
  Temperature
• Standard Air Temperature (28 levels) Microwave
  Surface Class
• Water Vapor Mass Mixing Ratio (28 layers) OLR
• Ozone Volume Mass Mixing Ratio (28 layers) Clear
  OLR
• Column Averaged Carbon Dioxide Cloud Top
  Pressure
• Microwave Surface Emissivity Cloud Top
  Temperature
• Infrared Surface Emissivity Cloud Infrared
  Emissivity
• Infrared Surface Reflectivity Cloud Infrared
  Reflectivity
• Cloud Fraction Clear Field of View Flag
• Water Vapor Saturation Mass Mixing Ration (28
  layers)

16
Other Products

• AMSR-E full resolution in BUFR format.
• MODIS spatial subset to AIRS footprints in
  BUFR format.
• AMSR-E Level 2 Product BUFR is in the works.

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Summary

• Current distribution of data is running smooth.
• Cloud Cleared radiance BUFR file is dependent
  upon QA Flags.
• Level 2 Product BUFR file is still being
  constructed.