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CrIMSS DR4923 Investigation Results

CrIMSS DR4923 Investigation Results. June 19, 2013. Alex Foo and Degui Gu NGAS NPP Mission Support. DR 4293 CrIMSS Surface Pressure Issue. JPL identified problem with surface pressure being too high relative to forecast surface pressure some time ago, but DR still open

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CrIMSS DR4923 Investigation Results

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  1. CrIMSS DR4923 Investigation Results June 19, 2013 Alex Foo and Degui Gu NGAS NPP Mission Support

  2. DR 4293 CrIMSS Surface Pressure Issue • JPL identified problem with surface pressure being too high relative to forecast surface pressure some time ago, but DR still open • Issue was discussed at EDR TIM on Monday June 10 • NGAS investigated what may have caused the issue using G-ADA • Generated and verified CrIS SDR geolocations • No error • Generated and verified terrain corrected GEOs • No error • Extracted and verified CrIS FOV terrain height and surface pressure information • No error • Examined how CrIS surface pressure is used by CrIMSS • Found error – CrIS surface pressure was adjusted again based • Fix is simple: comment out the call to perform the adjustment and use CrIS surface pressure directly

  3. Maps of Surface Elevation and Pressure Surface Pressure in EDR Surface Pressure from Forecast

  4. Maps of Surface Elevation CrIMSS EDR GFS

  5. Height vs Pressure Scatter Diagram • ZsurfvsPsurf • They should have been highly anti-correlated

  6. CrIS (FOV) Surface Height and Pressure Surface pressure interpolation and terrain height adjustment done correctly

  7. CrIMSS (FOR) Surface Height and Pressure CrIS Surface Height and Pressure CrIMSS Surface Height and Pressure

  8. Broken Correlation in CrIMSS Height and Pressure

  9. CrIMSS and CrIS Surface Height Consistent

  10. CrIMSS and CrIS Surface Pressure Inconsistent

  11. Consistent Surface Height and Pressure After Update CrIS Surface Height and Pressure CrIMSS Surface Height and Pressure

  12. Summary and Conclusion • CrIS SDR Geo and Terrain Correction were performed correctly • Surface pressure interpolated correctly from NCEP to CrIS FOVs, and terrain adjustment done correctly • CrIMSS algorithm has an error in using surface pressure and should be corrected • Fix: comment out the call to perform the adjustment in subroutine getNWP and use CrIS surface pressure directly

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