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Level 2 Ocean Salinity QWG #5

Level 2 Ocean Salinity QWG #5. 30 May – 1 June 2011. ARGANS & L2OS ESL. L2OS DPGS status. 8 March: new AFDs (OTTs & RGHNS3) 8 February: new OTTs for changed configuration. 8 February 2011. 8 March 2011. 26 May 2011. L2OS status. pre-FAT delivery 27 May, FAT 21-22 June

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Level 2 Ocean Salinity QWG #5

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  1. Level 2 Ocean Salinity QWG #5 30 May – 1 June 2011 ARGANS & L2OS ESL

  2. L2OS DPGS status 8 March: new AFDs (OTTs & RGHNS3) 8 February: new OTTs for changed configuration 8 February 2011 8 March 2011 26 May 2011

  3. L2OS status • pre-FAT delivery 27 May, FAT 21-22 June • What’s new in v500? • No longer setting Fm_valid to false when Fm_l1c_rfi flag is set • Fm_l1c_rfi = new L1c RFI tails flag (or’d with mitigation, strong, & point RFI flags) • Dg_L2_RFI replaces Dg_eaf_fov in UDP (L1c no longer contains Fm_eaf_fov) • OSUDP2 minor schema change (requiring SDV/BEAM update) • Removed Fg_ctrl_poor_geophysical from quality tests • Fixed SPH poor counter of successful retrieval • see http://www.argans.co.uk/smos/L2OS/verification.php • L2 RFI detection/mitigation: new AUX_CNFOSD/F thresholds & schema • RFI_std = 1.2, RFI_nsig = 3, Tg_num_RFI_max = 33% • No longer setting Fm_L1c_sun when Fm_L1c_sun_tails flag is set • Other PRs fixed: • Outlier detection now calculates median of differences as specified in ATBD • Name of the processor in log messages now conforms with ICD (includes L2OS version) • Corrected BULL_B orchestration

  4. New/changed flags in v500 • Sun point is marked with a 0.15 diameter circle in cosdir • ESL: agreed, circle with r = 0.075 • Width of suntails is fixed at 0.01 in cosdir ESL: sun tail flag should be closer to 0.1 than 0.01, (but low impact on salinity) L2OS: if Fml1c_sun_point or Fml1c_sun_glint_fov then Fm_l1c_sun= true, Fm_valid = false • Width of border flag is 0.01 in cosdir • Width of belt and suspenders is 0.02 in cosdir

  5. L2OS & L1PP v500 – first look L2OS v317 & L1OP 340 L2OS v500 & L1PP v500 More retrievals in N. Pacific RFI Less S. Pacific ice contamination

  6. L2OS & L1PP v500 – first look L2OS v317 & L1OP 340 L2OS v500 & L1PP v500 Smoother & wider cross-track quality – L1 flagging border, belt & braces?

  7. L2OS & L1PP v500 – first look L2OS v317 & L1OP 340 L2OS v500 & L1PP v500 L1 flagging border, belt & braces: Dg_border_fov

  8. OTTs – first look OTT1 from same orbit (20100802T153815) L1OP 340 L1PP v500 > +3K bias in HH (wrong NIR)

  9. L2OS & L1PP v500 RFI – first look Dg_RFI_L1 Fm_L2_RFI Fg_ctrl_suspect_RFI Dg_RFI_L1: % Fm_l1c_rfi (from all 4 L1c RFI flags) – in this case, only from Fm_RFI_Point Fm_RFI_Point: set if measurement has been affected by point source RFI identified in the AUX_RFI list, or it has exceeded an RFI threshold, or is negative Correlation between L1 & L2 RFI to be investigated

  10. L2OS v500 RFI detection/mitigation RFI detection off RFI detection on RFI mitigated retrievals L2OS v500 & L1OP 346 (from DPGS)

  11. L2OS v500 RFI detection/mitigation RFI detection off RFI detection on RFI mitigated retrievals L2OS v500 & L1OP 346 (from DPGS)

  12. L2OS v500 RFI detection/mitigation RFI detection off RFI detection on RFI mitigated retrievals L2OS v500 & L1OP 346 (from DPGS)

  13. Product Performance • Once new L1 500 and L2OS 500 are implemented in DPGS, check: • Ascending/descending differences • Land contamination • L1/L2 RFI detection/mitigation • Impact of sun and galactic signals • Performance of new roughness models (RGHNS1 received 26/05/2011) • Comparison of SMOS to Argo and climatology (SSS, WS) • Timetable? • L1OP & L2OS -> DPGS July 2011? • Analysis of August 2011 L2OS products • QWG#6 September 2011 • Go-ahead for reprocessing?

  14. Product Performance ± 0.5 psu South Pacific (15°S -25°S; 120°W- 130°W): mean values for retrieved SSS anomalies, filtered

  15. Product Performance Ascending orbits only: ± 0.5 psu South Pacific (15°S -25°S; 120°W- 130°W): mean values for retrieved SSS anomalies, filtered

  16. Product Performance Descending orbits only: ± 0.3 psu South Pacific (15°S -25°S; 120°W- 130°W): mean values for retrieved SSS anomalies, filtered

  17. Issue: discontinuities? SM_OPER_MIR_OSDAP2_20110502T010038_20110502T015440_317_001_1 wind/fronts/wave age/ecmwf...

  18. Product Performance: TEC Ascending orbits: TEC prior & post: South Pacific (15°S -25°S; 120°W- 130°W): mean values for retrieved SSS anomalies, filtered

  19. Product Performance: TEC Descending orbits: TEC prior & post: South Pacific (15°S -25°S; 120°W- 130°W): mean values for retrieved SSS anomalies, filtered

  20. OTT issues • Long-term OTT drift observed in reprocessed constant calibration L1b/c • & in new antenna model (see next slide) • OTT & DPGS • Update when FTT updated • OTT & reprocessing • Dependency on FTT updates (6 monthly) • Long cal (8 weeks) • NIR updates (15 days) • Mechanism: L1c & cod • Who? • OTT generation & LO sync • TBD

  21. New Antenna model OTT referenced to June 2010 Jun-Dec 2010: ascending AFFOV = -0.7 K/year (std 0.2), EAFFOV = -0.3 K/year (std 0.2) Jun-Dec 2010: descending AFFOV = -1.8 K/year (std 0.4), EAFFOV = -1.2 K/year (std 0.3)

  22. Solar flare? SM_OPER_MIR_OSDAP2_20110215T015901_20110215T025302_316_002_1

  23. L1c software error flag 20110302T062507 – 20110302T071906

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