V3.5 Level2 PGE Changes

1
V3.5 Level-2 PGE Changes

• Evan Manning
• Jet Propulsion Laboratory
• California Institute of Technology

2
V3.5 Changes

• These changes are referenced to v3.2.7, the build
  at NOAA Near-Real Time facility since the solar
  flare warmup Oct-Nov 2003.
• The full list of all packages in all builds is
  at http//airsteam.jpl.nasa.gov/password_p
  rotected/sps_build.txt
• Changes in V3.5.0
• MW RTA updates
• Change condensation threshold from 110 to 100
  in MW-only ret
• Continue processing if MW-only ret fails for
  water vapor
• IR tuning update to eliminate impact of cirrus
• Reduced channel lists in final ret
• Increase error estimate for MW in final ret
• Only 2 IR emissivity functions

3
V3.5 Changes - cont

• CH4 retrieval turned off
• Range checking for profiles vs. IR and MW RTA
  valid ranges.
• QC
• CC score tightened in initial to 1.2
• Tsurf diffs check added in final
• Liquid water threshold tightened from 0.03 to
  0.01 cm
• RetQAFlag, details below. Now lt 1 3K Tsurf
  outliers
• Many bug fixes.
• Probably will be in final V3.5 delivery
• 1.5 km (0.118 degrees) shift
• Floating-point-exception fixes
• CO when final retrieval fails

4
V3.5 RetQAFlag Details

• AIRS L2 RetQAFlag is a convenient single 16-bit
  QC flag
• Most users should concentrate on profiles where
  all bits are zero.
• Low byte is equivalent to retrieval_type

5
V3.5 RetQAFlag Details - cont

• RetQAFlag Bit Definition
• Bit Number Value Description
• 11-15 Spare, zero filled
• 10 1024 Lower part of profile not valid
• 9 512 Sea Surface Skin Temperature is suspect
• 8 256 This record type not yet validated
• 5-7 Spare, zero filled
• 4 16 Final retrieval rejected or not
  attempted
• 3 8 Final Cloud Clearing rejected or not
  attempted
• 2 4 Regression First Guess rejected or not
  attempted
• 1 2 Initial Cloud Clearing rejected or not
  attempted
• 0 (LSB) 1 MW retrieval rejected or not
  attempted

6
V3.5 RetQAFlag Details - cont

• Bits 9 10 are set for non-ocean profiles when
  the effective noise amplification from cloud
  clearing is more than 10.0.
• Bits 9 10 are set for ocean profiles when
• 1) Satellite zenith angle gt 50.0 degrees
• 2) Error estimate for surface temperature gt 0.6
  K.
• 3) Surface temperature lt 271.3 K.
• 4) Surface Temperature is more than 2 K below
  surface temperature retrieved by MW-only
  retrieval.
• 5) 925-1000 mbar water vapor gt 5 supersaturated
• 6) Cloud cleared radiance at 1227 cm-1 is more
  than 1 K colder than coldest of 9 input cloudy
  radiances for that FOV.
• 7) Sun glint location is within 200 km of center
  of profile

7
V3.5 Level-2 Interface Changes

• Full new up-to-date HTML specs at
  /net/psi/export/raid2/ref/tdscm/sps2tds_V3.5.0.0/I
  NTERFACES/html
• Next formal doc for v4.0.
• L2 Standard Product Changes
• Add CO_PPBV, CO_PPBV_Err
• Add olr, olr_err, clrolr, clrolr_err
• Add CC1_noise_eff_amp_factor
• L2 cloud-cleared radiance Product Changes
• Add Aumann clear-checking on final cloud-cleared
  radiance parameters
• CCN_sst1231r5, CCN_d2392r1, CCN_dd12g5, CCN_d12,
  CCN_d23, CCN_d34, CCN_lrt
• CCR_pass_clear_tests

8
V3.5 Level-2 Interface Changes (Cont)

• L2 support Product Changes
• Remove MWsurf_R0
• Add MWsecant_ratio
• Add MoonInViewIR
• Add CO_PPBV, CO_PPBV_Err
• CldFrcVis, CldFrcVisErr, ClrFrcVis, ClrFrcVisErr
  gt CldFracVis, etc. and changed from percentage
  to true fraction
• Add range check fields
• MW_psurf_range, MW_tsurf_range, MW_tair_range
• reg_psurf_range, reg_tsurf_range, reg_tair_range,
  reg_h2ocd_range, reg_ozocd_range, reg_cocd_range,
  reg_ch4cd_range
• fin_psurf_range, fin_tsurf_range, fin_tair_range,
  fin_h2ocd_range, fin_ozocd_range, fin_cocd_range,
  fin_ch4cd_range

9
V3.5 Level-2 Interface Changes (cont)

• Add physical retrieval and cloud clearing QC
  parameters CC1_Resid, CC1_Noise_Amp,
  Tsurf_4_CC1, TotCld_4_CC1, CC1_RCode, CC2_RCode,
  Phys_RCode, CCfinal_Resid, Tdiff_IR_MW_ret,
  AMSU_Chans_Resid, TotCld_4_CCfinal,
  TotCld_below_500mb, CCfinal_Noise_Amp,
  Surf_Resid_Ratio, Temp_Resid_Ratio,
  CC1_noise_eff_amp_factor
• Add residuals from final retrieval for AMSU-A and
  IR surface channels
• Phys_resid_AMSUA
• Phys_resid_IR_window_790, Phys_resid_IR_window_844
  , Phys_resid_IR_window_917, Phys_resid_IR_window_1
  231, Phys_resid_IR_window_2513,
  Phys_resid_IR_window_2616
• Add Aumann clear-checking on cloud-cleared
  radiance parameters
• CC1_sst1231r5, CC1_d2392r1, CC1_dd12g5, CC1_d12,
  CC1_d23, CC1_d34, CC1_lrt, CCN_sst1231r5
• CCN_d2392r1, CCN_dd12g5, CCN_d12, CCN_d23,
  CCN_d34, CCN_lrt
• CCR_pass_clear_tests
• Add totCldH2OStd