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SSS maps derived from L1 v500 and L1 reprocessing commissionning and L2 v500

SSS maps derived from L1 v500 and L1 reprocessing commissionning and L2 v500. J. Boutin, N. Martin, X. Yin. Data Processing. July 2010 L1 v500 Sun Off & L1 Commissionning Reprocessing November 2010 L1 Commissionning Reprocessing L2 v500 reprocessed at LOCEAN Tested L2 flags

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SSS maps derived from L1 v500 and L1 reprocessing commissionning and L2 v500

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  1. SSS maps derived from L1 v500 and L1 reprocessing commissionning and L2 v500 J. Boutin, N. Martin, X. Yin

  2. Data Processing July 2010 L1 v500 Sun Off & L1 Commissionning Reprocessing November 2010 L1 Commissionning Reprocessing L2 v500 reprocessed at LOCEAN Tested L2 flags CTRL_SEL_GP;CTRL_VALID;CTRL_ECMWF = 1 CTRL_NUM_MEAS_MIN;CTRL_MANY_OUTLIERS;CTRL_SUNGLINT;CTRL_MOONGLINT;CTRL_GAL_NOISE;CTRL_REACH_MAXITER;CTRL_MARQ;CTRL_CHI2_P;CTRL_CHI2;CTRL_SUSPECT_RFI = 0

  3. 1°x1° SSS maps computed from averages of SMOS SSS weighted by their spatial resolution R2 and variance of the error 2(derived by the retrieval): SSS maps computation

  4. L2 v500 Ascending swaths SSS Center swath July L1 v500 sun off L1 Commissionning Reprocessing

  5. L2 v500 Descending swaths SSS Center swath July L1 v500 sun off L1 Commissionning Reprocessing

  6. L1 v500 Sun on or Sun off - L2 v500 Ascending swaths SSS Center swath July L1 v500 sun off L1 v500 sun on

  7. L2 v500 Descending swaths SSS Center swath July L1 v500 sun off L1 v500 sun on More stripes on L1 sun on than on L1 sun off on descending orbits! (look at the southern ocean)

  8. L1 v500 sun off – L2 v500 Asc SSS Error on WS 2m/s Whole swath Center swath +/-300km RFI better sorted out at the center of the swath

  9. L1 v500 sun off – L2 v500 Asc N Error on WS 2m/s Whole swath Central swath +/-300km

  10. L1 v500 sun off – L2 v500 Desc SSS Error on WS 2m/s Whole swath Central swath +/-300km RFI better sorted out at the center of the swath

  11. L1 v500 sun off – L2 v500 Desc N Error on WS 2m/s Whole swath Central swath +/-300km

  12. Comparison with ARGOL2 V317-August 2010 SMOS -CLIMATO ARGO -CLIMATO SMOS-ARGO SSS anomalies seen by ARGO in tropical Pacific seen by SMOS but Pbs close to land, ice Pbs at high wind speed (see next slide), anomaly in Pacific ITCZ more negative on SMOS Boutin et al., subm, 2011

  13. SMOS L2v317 - ARGO SSS (3-31 August 2010; asc orbits) versus wind speed (center of orbit) Statistics computed after averaging over +/-5days; +/-50km over 3-12m s-1 Colocation radii: +/-5days; +/-50km ITCZ trop Pac N: DSSS=-0.18+/-0.44 N=236 Subtropical Atl N: DSSS=0.1+/-0.35 N=59 South Indian: DSSS=0.11+/-0.46 N=50 South Pacific: DSSS=0.09+/-0.56 N=160

  14. Comparison with ARGOL1 ~v500 – L2 V500 - July 2010 SMOS -CLIMATO ARGO -CLIMATO SMOS-ARGO SSS too high close to ice, too low close to land

  15. SMOS L1v500 sun off- L2v500 - ARGO SSS (July 2010; asc orbits) versus wind speed (center of orbit) Statistics computed after averaging over +/-5days; +/-50km over 3-12m s-1 Colocation radii: +/-5days; +/-50km ITCZ trop Pac N: DSSS=-0.05+/-0.40 N=248 Subtropical Atl N: DSSS=0.02+/-0.22 N=69 South Indian: DSSS=0.06+/-0.56 N=52 South Pacific: DSSS=0.16+/-0.63 N=186 Reduced biases wrt to commissionning reprocessing but very large std in South Pacific (cold region); in southern hemisphere bias between asc and desc

  16. SMOS L1v500 sun on L2v500 - ARGO SSS (1-27July 2010; asc orbits) versus wind speed (center of orbit) Statistics computed after averaging over +/-5days; +/-50km over 3-12m s-1 Colocation radii: +/-5days; +/-50km ITCZ trop Pac N: DSSS=0.01+/-0.43 N=230 Subtropical Atl N: DSSS=0.19+/-0.22 N=65 South Indian: DSSS=0.21+/-0.55 N=48 South Pacific: DSSS=0.27+/-0.70 N=170 Very large std in South Pacific; no noticeable improvement wrt v500 sun off (even worse); in southern hemisphere bias between asc and desc

  17. SMOS L1v500 sun off- L2v500 - ARGO SSS (July 2010; desc orbits) versus wind speed (center of orbit) Statistics computed after averaging over +/-5days; +/-50km over 3-12m s-1 ITCZ trop Pac N: DSSS=-0. 06+/-0.45 N=248 Subtropical Atl N: DSSS=0.06+/-0.32 N=67 South Indian: DSSS=-0.14+/-0.38 N=52 South Pacific: DSSS=-0.27+/-0.85 N=188 Very large std in South Pacific; in southern hemisphere bias between asc and desc

  18. SMOS L1v500 sun on- L2v500 - ARGO SSS (July 2010; desc orbits) versus wind speed (center of orbit) Statistics computed after averaging over +/-5days; +/-50km over 3-12m s-1 ITCZ trop Pac N: DSSS=0. 02+/-0.51 N=233 Subtropical Atl N: DSSS=0.23+/-0.33 N=67 South Indian: DSSS=-0.03+/-0.35 N=49 South Pacific: DSSS=-0.15+/-0.78 N=156 Very large std in South Pacific; no noticeable improvement wrt v500 sun off; in southern hemisphere bias between asc and desc

  19. Conclusions • L1 v500 sun off much better than L1 commissionning reprocessing • L1 v500 sun on does not perform better than L1 v500 sun off (even worse) ! Preliminary results; need to be consolidated on November v500! • RFI flag works better at the center of the swath (+/-300km) than at the edge of the swath

  20. Flags and SMOS_MODE • Oceanographers implicated in SMOS_MODE have asked for recommendations about flags to be used Do we agree on recommending to apply: • CTRL_SEL_GP;CTRL_VALID;CTRL_ECMWF = 1 • CTRL_NUM_MEAS_MIN;CTRL_MANY_OUTLIERS;CTRL_SUNGLINT;CTRL_MOONGLINT;CTRL_GAL_NOISE;CTRL_REACH_MAXITER;CTRL_MARQ;CTRL_CHI2_P;CTRL_CHI2;CTRL_SUSPECT_RFI = 0 • Add recommendation beginning of ATBD? (looking in ATBD, I haven’t find description of ctrl_poor_geophys and ctrl_poor_retrieval)

  21. L1 Commissionning reprocessing – L2 v500 Asc July Whole swath Center swath

  22. L1 Commissionning reprocessing – L2 v500 Desc July Whole swath Center swath

  23. L1 commissionning reprocessing-L2 v500November (center swath -Asc) OTT Nov OTT July

  24. L1 commissionning reprocessing-L2 v500November (center swath - Desc) OTT Nov OTT July

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