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Level 2 Ocean Salinity PM #19

Level 2 Ocean Salinity PM #19. @ LOCEAN, Paris. 4-5 November 2010. ARGANS & L2OS ESL. L2OS status. L2OS 0317 delivery 22 November, QWG 1-2 December, FAT 6 December 0317 delta from 0316 Corrected calculation of relative wind direction (phiRelatWind)

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Level 2 Ocean Salinity PM #19

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  1. Level 2 Ocean Salinity PM #19 @ LOCEAN, Paris 4-5 November 2010 ARGANS & L2OS ESL

  2. L2OS status • L2OS 0317 delivery 22 November, QWG 1-2 December, FAT 6 December • 0317 delta from 0316 • Corrected calculation of relative wind direction (phiRelatWind) • AUX_BULL_B (IERS Bulletin B) instead of MPL_ORBSCT (orbit selection bug fixed too) • New roughness models 2 & 3 • New quality index (Dg_quality_SSS) algorithm & flagging • Outstanding tasks before delivery • new roughness models: • Update ATBD & TGRD • Update unit tests • Cross-verify roughness model 3 with BEC results (Ifremer done) • review Product Performance Status Report • write Product Performance Evaluation Plan

  3. Relative wind direction Lower cross-track bias in retrieved SSS1 with corrected phiRelatWind Faster convergence (roughness model 1) 0317 0316

  4. Sun glint

  5. Dg_quality_SSS

  6. Quality flags

  7. Roughness model 2 0316 0317

  8. Roughness model 3 0316 0317

  9. Roughness model 2 verification Cross-verification with Ifremer breadboard (right)

  10. OTTs for new roughness models 2 & 3 OTT2F OTT3F

  11. TEC & Faraday rotation AUX_FARA Faraday rotation angle delta +-0.5 degree, -3+2 tecu (L1c TEC = AUX_FARA single predicted )

  12. Faraday rotation angle verification • Faraday rotation target-to-spacecraft is not the same (or opposite in sign) as Faraday rotation spacecraft-to-target using SO-TN-ESA-GS-5873 • Computation of faraday rotation target-to-spacecraft gives the rotation at the earth’s surface, not after the radiation is propagated to the spacecraft • Computation of Faraday rotation target-to-spacecraft with altitude = SMOS altitude (796 km) gives the same Faraday rotation as L1c (which is spacecraft-to-target) • L2OS attitude & angle calculations have been successfully cross-verified with those from L1c and independently using Matlab code from Montse • 0317 continues to use EECFI spacecraft-to-target (same as L1c & 0316)

  13. Faraday rotation angle verification • Test case 1: • SM_OPER_MIR_SCSF1C_20100802T153816_20100802T163215_344_001_1 • (ascending orbit), GP ID 5178770, measurement #1, snapshot ID 39365165 • L1c Faraday rotation angle 0.401 • AUX_FARA: • Single_P 0.40 Precise_P 0.41 • Single_R 0.53 Precise_R 0.48 • Single_C 0.49 Precise_C 0.46 • L2OS (all results agree with Matlab formulae from Montse) • spacecraft-to-target 0.4009 (0316 & 0317) • target-to-spacecraft (spherical earth): • 0.148 (at target, altitude 0 km) • 0.311 (at altitude 400 km) • 0.4009 (at SMOS altitude 796 km)

  14. Galactic Noise • Dg_sky (top), Fg_ctrl_gal_noise (bottom) • Tm_high_gal_noise = 4 (left), 2.8 (right) SM_TEST_MIR_OSUDP2_20100802T153816_20100802T163215_317_001_0, latitude 14-16

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