CrIMSS Level 3 @ Sounder PEATE Preliminary Evaluation - PowerPoint PPT Presentation

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  1. CrIMSS Level 3 @ Sounder PEATEPreliminary Evaluation Sung-Yung Lee Irina Tkatcheva October 2013

  2. Introduction to Level 3 at Sounder PEATE • Preliminary evaluation of Level 3 at Sounder PEATE • Gridded EDR data at one degree by one degree resolution • MW only level 3 includes FORs with High, LowIR and LowMW quality (excludes only PoorQual) • IR+MW level 3 includes FORs with HighlR and LowIR quality (excludes LowMW and Poor Qual) • Daily for July 21 – 28 and 8 day level 3 (Mx7.1) • Parameters in CrIMSS Level 3 • Temperature and water vapor at 101 levels • Skin temperature • Total Precipitable Water Vapor and Total Ozone Burden • Ascending/Descending separately • Mean, St Dev, Counts, total weights • In general CrIMSS level 3 is consistent with AIRS level 3 • AIRS has height dependent quality control, while CrIMSS reject/accepts the entire profile • MW Only level 3 are similar • AIRS has best retrievals while CrIMSSIR+MW has no MW only retrievals • AIRS uses HDF-EOS grid format, while CrIMSS uses NetCDF4 (HDF5 based)

  3. Summary • CrIMSS has gaps in IR+MW retrievals over Sahara, especially ascending • Zonal mean TPWV, TotO3, T, Tsurf compared • Temperature has large zonal biases at some levels • CrIMSS Total Ozone Burden may not be ready • CrIMSS Temperature shows striping at certain levels, due to ATMS • In general, CrIMSS temperature map seems to be noisier than that of AIRS (V6) • CrIMSS has skin temperature < 220. while AIRS does not • AIRS QC on surface skin temperature is tighter • Other issues (mostly minor) at the end of this presentation

  4. Zonal Mean Temperature (1.3mb)

  5. Zonal Mean Temperature (32mb)

  6. Zonal Mean Temperature (151mb)

  7. Zonal Mean Temperature (407mb)

  8. Zonal Mean Temperature (827mb)

  9. Zonal Mean TPWV

  10. Zonal Mean Total Ozone

  11. Surface Skin TemperatureDescending • Top: CrIMSS • Bot: AIRS

  12. Surface Skin TemperatureAscending • Top: CrIMSS • Bot: AIRS

  13. Surface Skin TemperatureDifference(CrIMSS-AIRS) • Top: Ascending • Bot: Descending

  14. Surface Skin Temperature Scatter Diagram • CrIMSS has grid points with Tsurf < 220, while AIRS does not Ascending Descending

  15. Temperature1.3 mbDescending • Top: CrIMSS • Bot: AIRS

  16. Temperature1.3 mbAscending • Top: CrIMSS • Bot: AIRS

  17. Temperature32 mbDescending • Top: CrIMSS • Bot: AIRS

  18. Temperature32 mbAscending • Top: CrIMSS • Bot: AIRS

  19. Temperature151mbDescending • Top: CrIMSS • Bot: AIRS

  20. Temperature151mbAscending • Top: CrIMSS • Bot: AIRS

  21. Temperature407mbDescending • Top: CrIMSS • Bot: AIRS

  22. Temperature407 mbAscending • Top: CrIMSS • Bot: AIRS

  23. Temperature827 mbAscending • Top: CrIMSS • Bot: AIRS

  24. St Dev for Temperature151 mbAscending • Top: CrIMSS • Bot: AIRS

  25. Temperature Difference Map showsStriping • Top: Ascending • Bot: Descending

  26. Total Ozone Burden Ascending • Top: CrIMSS • Bot: AIRS

  27. Total Ozone Burden Descending • Top: CrIMSS • Bot: AIRS

  28. Total Ozone Scatter Diagram Ascending Descending

  29. Other Issues with IDPS EDR Software • FOV biases in CrIS SDR • Some channels have biases on the order of .2K between detectors • Sweep direction biases in CrIS SDR • Even FORs have biases wrtodd FORs • Local angle correction • Based on calculated radiances before launch • Need to validate with real data

  30. Day/Night Boundary (1) • Map of Brightness Temperature difference ( Tb_sarta – Tb_obs) of 2335 cm-1 channel near Antarctica • Non-LTE correction in SARTA works pretty well during day. • Non-LTE effects starts before sunrise (at the surface) and ends after sunset. • CrIMSS EDR uses non-LTE channels when sun is below horizon at the surface

  31. Day/Night Boundary (2) • 1.3 mb temperature for a granule on July 21, 2013 (Mx7.1) • The white diamonds represent the terminator when solar zenith angle changes from <90 degree to >90 degree • While the surface is dark, the upper atmosphere is still in the sun and hence there is a residual effect of non-LTE • While the IDPS software does not use CrIS shortwave channels during day time, it uses when the surface is dark.