Www.argans.co.uk SMOS L2 Ocean Salinity Level 2 Ocean Salinity PM #19 4-5 November 2010 ARGANS &...
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Transcript of Www.argans.co.uk SMOS L2 Ocean Salinity Level 2 Ocean Salinity PM #19 4-5 November 2010 ARGANS &...
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SMOS L2 Ocean Salinity
Level 2 Ocean Salinity PM #19
4-5 November 2010
ARGANS & L2OS ESL
@ LOCEAN, Paris
www.argans.co.uk
SMOS L2 Ocean Salinity
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
www.argans.co.uk
SMOS L2 Ocean Salinity
Relative wind direction
0317 0316
Lower cross-track bias in retrieved SSS1 with corrected phiRelatWind
Fasterconvergence(roughness model 1)
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SMOS L2 Ocean Salinity
Roughness model 2 verification
Cross-verification with Ifremer breadboard (right)
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SMOS L2 Ocean Salinity
TEC & Faraday rotation
AUX_FARA Faraday rotation angle delta +-0.5 degree, -3+2 tecu(L1c TEC = AUX_FARA single predicted )
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SMOS L2 Ocean Salinity
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)
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SMOS L2 Ocean Salinity
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 0.41Single_R 0.53 Precise_R 0.48Single_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)