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Comparison of SSS of two windows

X. Yin, J. Boutin, N. Martin LOCEAN. Comparison of SSS of two windows. Outline 1. July 2010 2. November 2010. Method, July. Circular window : Use 10 days of ascending orbits in July 2010 OTT computed from 5 asc. orbit between 2 and 5, July in S Pac

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Comparison of SSS of two windows

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  1. X. Yin, J. Boutin, N. Martin LOCEAN Comparison of SSS of two windows

  2. Outline1. July 20102. November 2010

  3. Method, July Circular window: Use 10 days of ascending orbits in July 2010 OTT computed from 5 asc. orbit between 2 and 5, July in S Pac Use radiometric accuracy of L1 file with correction ( adjusted for Tx and Ty by a multiplicative factor, 1.04, corresponding to the observed increase of Obs_rad_acc/Theoretical_Rad_Acc between hexagonal and circular window) Use footprint size without correction (should be corrected by a factor 0.76/0.5, R. Oliva, pers. comm.) Hexagonal window Use of 10 days of ascending orbits in July 2010 OTT computed from 5 asc. orbit between 4 and 9, July in S Pac Maps built from an average of SSS weighted by variance of the errors Comparison with ISAS SSS maps

  4. SMOS SSS – ISAS SSS, July 1-11, 2010 Circular window hexagonal window No improvements in RFI suspected areas

  5. Maps of SMOS SSS and ISAS SSS, July 1-11, 2010 Circular window ISAS hexagonal window ISAS No improvements in RFI suspected areas

  6. Without SuspectRFI and ManyOutliers flags Standard L2OS flags Without SuspectRFI flag The flag of ManyOutliers is the main trigger of blanks of SSS

  7. Method, Nov Circular window: Use of ascending orbits in Nov 2010 OTT computed from 1 asc. orbit on 9 Nov in S Pac Use radiometric accuracy of L1 file with correction (adjusted for Tx and Ty by a multiplicative factor, 1.04, corresponding to the observed increase of Obs_rad_acc/Theoretical_Rad_Acc between hexagonal and circular window) Use footprint size without correction (should be corrected by a factor 0.76/0.5, R. Oliva, pers. comm.) Hexagonal window Use of ascending orbits in Nov 2010 processed by Argans (only until 21 Nov; missing orbits) OTT computed from asc+desc orbits Maps built from an average of SSS weighted by variance of the errors Comparison with ISAS SSS maps

  8. SSS circular – SSS ISAS SSS hexagonal – SSS ISAS

  9. SSS Circular window SSS ISAS

  10. SSS Hexagonal window SSS ISAS

  11. Conclusions 1.Still biases close to coast 2.The flagged areas are similar (even wider) with circle window 3. The flag of ManyOutliers is the main trigger of blanks of SSS NB: OTT computed differently

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