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SMOS – in situ comparisons

SMOS – in situ comparisons. J. Boutin*, N. Martin*, O. Hernandez*, N. Reul + , G. Reverdin* *LOCEAN, + IFREMER. Outline. SMOS-ARGO in 2012 SPURS-STRASSE comparisons Gulf stream region. -SSS between 25 & 40 psu for latitudes between 30S & 30°N ( Hence SSS=-999 are discarded)

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SMOS – in situ comparisons

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  1. SMOS – in situ comparisons J. Boutin*, N. Martin*, O. Hernandez*, N. Reul+, G. Reverdin* *LOCEAN, +IFREMER

  2. Outline • SMOS-ARGO in 2012 • SPURS-STRASSE comparisons • Gulf stream region

  3. -SSS between 25 & 40 psu for latitudes between 30S & 30°N (Hence SSS=-999 are discarded) -SSS between 30 & 40 psu for latitudes outside 30°S-30N (Hence SSS=-999 are discarded) -Dg_af_fov >=130In addition we test the following flags:"control_flag_set=CTRL_SEL_GP;CTRL_ECMWF,"control_flag_clear=CTRL_NUM_MEAS_MIN;CTRL_NUM_MEAS_LOW;CTRL_MANY_OUTLIERS;CTRL_SUNGLINT;CTRL_MOONGLINT;CTRL_REACH_MAXITER;CTRL_MARQ;CTRL_CHI2_P;CTRL_CHI2;CTRL_SUSPECT_RFI","science_flag_set=SC_LOW_WIND;SC_LAND_SEA_COAST1","science_flag_clear=SC_ICE;SC_SUSPECT_ICE"Some of these flags have been kept by continuity with previous versions. With respect to your comments:CTRL_SEL_GP is not used anymore => to be removedCTRL_CHI2 is redundant withCTRL_CHI2_P (in case of more than 30 meas.) =>to be removedCTRL_NUM_MEAS_MIN;CTRL_NUM_MEAS_LOW : useless if Dg_af_fov >=130 is tested (but may be useful if we would decide different levels of global flags, e.g., Good, probably good, probably bad, bad)SC_SUSPECT_ICE: taken by precaution; we also strongly recommend in v600 to define SC_ICE with Tg_ice_concentration=0% instead of 30%CTRL_SIGMA: we don't use it because we always use sigma to weight our averages We don't use the combined flags poor_geophysical flag and  fg_ctrl_poor_retrieval , as we prefer to get original flags (in case definitions of combined flags change).Range of SSS: although we agree that SSS could be lower than 25 in the tropics, there are also a lot of RFIs not well filtered that can lead to low SSS so we prefer to be safe and I would recommend for a 'Good' flag to keep these ranges.

  4. SPURS areaO. Hernandez, J. Boutin, G. Reverdin, N. Martin

  5. Large scale bias between SMOS & AQUARIUS averaged over SPURS area We first correct for a mean bias between SMOS & WOA or AQUARIUS & WOA

  6. Comparisons SMOS-Toucan & Colibri (+/-9jours, +/-50km) Mean and standard deviation of SSS SMOS – SSS TSG for each campaign (Colibri and Toucan). Correction of bias B1 is applied. In green: colocalisations in October 2011 Mean negative bias because WOA SSS often lower than in situ SSS

  7. Gulf Stream areaJ. Boutin, N. Reul, G. Reverdin Results obtained with CATDS CEC (after RFI per angle classes filtering, 5°x5° bias correction)

  8. L2 OS in Gulf Stream region 26 transects of Oleander ship (validated by G. Reverdin): Asc+Desc, Des, Asc Better consistency between SMOS Asc & SMOS Desc than with ship data • Error on SSSA or SSSD~0.6 • but error SSSsmos A+D wrt Oleander = 1.2 • WHY???

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