1 Boutin et al., 2014 SMOS Salinity anomalies: new insights into SMOS capability at sensing SSS variability and into the improvements to be made in the.

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Presentation transcript:

1 Boutin et al., 2014 SMOS Salinity anomalies: new insights into SMOS capability at sensing SSS variability and into the improvements to be made in the next years... J. Boutin 1, N. Martin 1, N. Kolodziejczyk 1, O. Hernandez 1, G. Reverdin 1, F. Gaillard 2 1 LOCEAN Paris, France 2 LPO/IFREMER, Brest, France

2 Boutin et al., ‘OTT’ Bias corrected region Hasson et al N RMSDifference (SMOS SSS (1 MONTH or 10 days-100x100KM 2 ) –IN SITU SSS COMPARISON OF SMOS WITH IN SITU SSS 0.33 Islands + RFI? Hasson et al Gulf stream – 10days Reul et al. GRL <0.2 1 month-200km Durand et al 2013 SPURS - Hernandez et al After correcting Large scale seasonal Biases Amazon Plume 10days - Reul et al Rain Boutin et al 2013

3 Boutin et al., 2014 SMOS Salinity maps CATDS CEC LOCEAN: ESA level 2 SSS (reprocessing version 5) mapped at monthly & 0.25° spatial resolution ; Running average over 100x100km 2 July 2010-June 2014 Ascending + Descending passes available on demand on (CATDS CEC-LOCEAN product)

4 Boutin et al., 2014 Optimal Interpolations of in situ SSS Optimal interpolation of in situ S (ARGO, TAO...) – smoothing ~300km –~0.5° resolution at the equator monthly fields (Myocean product since 2013) Keep only pixels where PCTVAR<80% (100%=no information from in situ data) WOA 2013 climatology ISAS v6 (see description of In Situ Analysis System in Gaillard et al. 2009) Objectively analyzed climatology of in situ S – 1° resolution monthly averaged climatology

5 Boutin et al., 2014 SMOS v5 – ISAS SSS (07/10 to 06/14) current??? Land (<800km) RFIs

6 Boutin et al., 2014 Interannual anomalies Most of SMOS SSS biases are about systematic from one year to the other => build a SMOS monthly SSS climatology (07/ /2014) SMOS SSS anomalies wrt SMOS 4yr climatology => interannual variability of SMOS SSS Build ISAS SSS monthly climatology (07/ /2014) ISAS SSS anomalies wrt ISAS climatology => interannual variability of ISAS SSS

7 Boutin et al., 2014 Interannual anomalies (see Durand et al. Ocean Dynamics 2013 (tropical Indian Ocean and IOD); Hasson et al. JGR 2014 (La Niña in tropical Pacific Ocean)

8 Boutin et al., 2014 Further than 800km from the continents 100km-monthly SMOS SSS wrt ISAS SSS and SMOS wrt ISAS SSSanomalies 0.2

9 Boutin et al., 2014 Further than 1200km from the continents 100km-monthly SMOS SSS wrt ISAS SSS and SMOS wrt ISAS SSSanomalies 0.2 When monthly systematic biases are removed, RMSD (SMOS-ISAS) ~0.2 but ISAS is not the truth (it does not sample mesoscale (it is smoothed over ~300km) and it is affected by ARGO undersampling...) – Doing similar exercise with ship SSS averaged over 0.25° in SPURS region, we found 0.15 (Hernandez et al. 2014)!

10 Boutin et al., 2014 Monthly climatologies differences: ISAS ( )– WOA 2013 ( ) Rmsd: 45S-45N: S-30N: ° resolution Climatologies built from in situ measurements with different optimal interpolation methods are quite different, RMSD (ISAS-WOA) ~0.2, similar order of magnitude as RMSD (SMOS-ISAS) when systematic biases are removed....

11 Boutin et al., 2014 Annual climatologies differences 0.25° resolution WOA-ISAS SMOS-ISAS

12 Boutin et al., 2014 Summary & perspectives SMOS SSS version 5 experiences large systematic biases (latitudinal/seasonal, vicinity of continents, RFIs) ; when considering 4-year anomalies, RMSE(SMOS_SSSa-ISAS_SSSa) ~0.2: this RMSD represents SMOS SSS uncertainties + ISAS SSS uncertainties When doing similar exercise using TSG SSS 0.25° in the subtropical Atlantic, RMSE (SMOS_SSS-ship_SSS)~0.15 => New satellite SSS provide a spatial bi- dimensional information about SSS variability at scales ~100km not accessible by other in situ network SMOS SSS version 6 will have less latitudinal biases and RFIs pollution will be better sorted out but biases in the vicinity ( RMSD SSS (SMOS-ISAS) will remain high due to continent pollution but what about RMSD SSSanomalies???? Next QWGs!