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SMOS L2 Ocean Salinity

Level 2 Ocean Salinity PM #19

4-5 November 2010

ARGANS & L2OS ESL

@ LOCEAN, Paris

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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

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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

Sun glint

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SMOS L2 Ocean Salinity

Dg_quality_SSS

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SMOS L2 Ocean Salinity

Quality flags

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SMOS L2 Ocean Salinity

Roughness model 2

0316 0317

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SMOS L2 Ocean Salinity

Roughness model 3

0316 0317

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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

OTTs for new roughness models 2 & 3

OTT2F OTT3F

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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)

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SMOS L2 Ocean Salinity

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