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Level 2 Ocean Salinity QWG #2

Level 2 Ocean Salinity QWG #2. 13-14 September 2010. ARGANS & L2OS ESL. L2OS DPGS retrievals. CPU reset. L1OP 330. L1OP 342. L1OS 314 OTTs. December. March. June. L2OS DPGS retrievals. L1OP 344 & L2OS 316. December. March. June. August. L2OS DPGS good quality retrievals.

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Level 2 Ocean Salinity QWG #2

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  1. Level 2 Ocean Salinity QWG #2 13-14 September 2010 ARGANS & L2OS ESL

  2. L2OS DPGS retrievals CPU reset L1OP 330 L1OP 342 L1OS 314 OTTs December March June

  3. L2OS DPGS retrievals L1OP 344 & L2OS 316 December March June August

  4. L2OS DPGS good quality retrievals

  5. L2OS 0315 – L1OP 342 05/07/2010 L2OS 0315 – wrong OTT

  6. L2OS 0316 – L1OP 344 06/07/2010 L2OS 0316 & new OTTs using L1PP 340

  7. L2OS 0316 – L1OP 344 09/07/2010 L2OS 0316 & new OTTs using L1OP 344

  8. L2OS 0316 – L1OP 344 02/08/2010 L2OS 0316 & new OTTs using L1PP 340 with new FTR

  9. L2OS status • OTTs made from L1PP verified with L1OP (TN available) • Faraday rotation verified • Product verification ongoing • Configuration & tuning • Improved outlier detection threshold • Model 1 performs better retrieving wind speed instead of wind vectors • Testing AFFOV only or limited xi/eta • L1c full pol Stokes 3 & forward model mismatch – better to process dual from full? • Retrieval quality criteria need evaluation/refining • Empirical model needs tuning • Land contamination still an issue • Drift in retrieved salinity – instrument?

  10. Salinity drift 5 day average SSS2 9-13 July 2010

  11. Salinity drift 5 day average SSS2 28 July – 1 August 2010

  12. Salinity drift 5 day average SSS2 3-7 August 2010

  13. Salinity drift 5 day average SSS2 30 August – 3 September 2010

  14. Activity: OTT verification – L1PP/OP • Action: ARGANS • Status: verified (see TN) – difference between OP/PP same as between ascending/descending & models

  15. Activity: Faraday rotation angles & sign • Action: ARGANS • Status: L2OS 0316 verified with L1OP & L1PP • angles match L1OP 344 & L1PP exactly SM_OPER_MIR_SCSF1C_20100802T153816_20100802T163215_344_001_1

  16. Activity: attitude computation: xi/eta • Action: ARGANS • Issue: L2OS performs attitude computation with EECFI instead of using L1 angles, because xi/eta needed for applying OTTs in antenna frame • ESA TN from Montse version v3.4 (& 3.3) computes off-nadir angle using flat earth assumption – giving large errors. • Recommend new TN with spherical earth & mini-TDS for verification? • L2OS will use L1 angles & no longer need BFP/MISP/EECFI • all angles will be target to satellite

  17. Activity: Gibbs 2 & 3 analysis • Action: ACRI, LOCEAN • Status: • Joe analysed Gibbs 2, couldn’t make any sense of the data • TN available from Claire Henocq, SEPS-GS, dual pol only • Should be considered at L1, together with land contamination (& earth-sky) • L2OS will look at results when Gibbs 2/3 is known to be working

  18. Activity: OTT sensitivity/bias correction • Action: ICM, ACRI • OTT not stable – varies with latitude &/or land proximity (Jean-Luc’s TN) • Also see BEC’s presentation – analysis continuing

  19. Activity: Sensitivity of LO calibration frequency • Action: ICM • Status: waiting for improvements in retrieval quality before analysis • Requirements: • “controlled” drift situation • One month of full pol data acquired with LO calibrated every 6 min • Draft analysis plan (comparing two consecutive months, 10 + 6 min): • Tb statistics • SSS statistics • Number of retrievals • ...

  20. Activity: Full pol analysis comparing Stokes 3 & 4 with L1c • Action: ARGANS • Status: need 3rd Stokes correction in L1 or forward model (TBD)? • LOCEAN sent comparison to Raffaele showing L1OP not working (L1PP ok) • ARGANS & CLS: L1c & forward model Stokes 3 & 4 mismatch

  21. Activity: analysis of TEC accuracy/retrieval • Action: ARGANS • Status: ongoing Before correcting L2OS Faraday rotation angle (left); after (right)

  22. Activity: RFI Fiji RFI DPGS orbit: Dg_chi2_1 (left), Dg_chi2_P_1 (right)

  23. Activity: RFI Dg_num_outliers along swath – double peaks around N. New Zealand & Fiji

  24. Activity: RFI RFI uncorrected (left), corrected (right) full pol Fiji orbit: full from full

  25. Activity: RFI RFI uncorrected (left), corrected (right) full pol Fiji orbit: dual from full

  26. Activity: Semi-empirical roughness model improvement • Action: ICM • Status: • No updated parameters yet to be included in L2OS processor • Ongoing study (methodology prepared, first tests) • Need many orbits to have significant statistical analysis • Need a good filtering of the data, as well as the best possible OTT • More details by C. Gabarró on Wednesday

  27. Activity: stripping • Increase threshold for valid number of measurements Tg_num_meas_valid 16 (left), 30 (centre), 50 (right)

  28. Algorithm Improvements • Retrieve SSS1 using WS, not vectors • Add RFI support • use L1 flags & AUX_DGGRFI • detect at L2 • write L2 flags for users, analysis, & AUX_DGGRFI • OTT strategy • TEC

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