# Presentation: 830954

## V3.5 Level-2 PGE Changes

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

## 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_protected/sps_build.txt](http://airsteam.jpl.nasa.gov/password_protected/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***

## 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 < 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***

## 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**

## 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******	***

## 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 > 50.0 degrees***
***2) Error estimate for surface temperature > 0.6 K.***
***3) Surface temperature < 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 > 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***

## 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/INTERFACES/*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

## 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 => 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**

## 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_1231, 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***