1 Boutin et al., Avril 2015, SMOS-OCEAN TOSCA SMOS Salinity anomalies – Towards the correction of...
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1 Boutin et al., Avril 2015, SMOS- OCEAN TOSCA SMOS Salinity anomalies – Towards the correction of SMOS SSS systematic biases - 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
1 Boutin et al., Avril 2015, SMOS-OCEAN TOSCA SMOS Salinity anomalies – Towards the correction of SMOS SSS systematic biases - J. Boutin 1, N. Martin 1,
1 Boutin et al., Avril 2015, SMOS-OCEAN TOSCA SMOS Salinity
anomalies Towards the correction of SMOS SSS systematic biases - 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
Slide 2
2 Boutin et al., Avril 2015, SMOS-OCEAN TOSCA Outline SSS
variability at global scale: SMOS and in situ SSS optimal
interpolation results Preliminary results of new SMOS SSS ESA
v6
Slide 3
3 Boutin et al., Avril 2015, SMOS-OCEAN TOSCA 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 www.catds.fr (CATDS CEC-LOCEAN
product)www.catds.fr
Slide 4
4 Boutin et al., Avril 2015, SMOS-OCEAN TOSCA Optimal
Interpolations of in situ SSS Optimal interpolation of in situ S
(ARGO, TAO...) smoothing ~300km ~0.5 resolution at the equator
2005-2014 monthly fields (Myocean product since 2013) Keep only
pixels where PCTVAR
6 Boutin et al., Avril 2015, SMOS-OCEAN TOSCA Interannual
anomalies Most of SMOS SSS biases are about systematic from one
year to the other => build a SMOS monthly SSS climatology
(07/2010-06/2014) SMOS SSS anomalies wrt SMOS climatology =>
interannual variability of SMOS SSS Build ISAS SSS monthly
climatology (07/2010- 06/2014) ISAS SSS anomalies wrt ISAS
climatology => interannual variability of ISAS SSS
Slide 7
7 Boutin et al., Avril 2015, SMOS-OCEAN TOSCA Interannual
anomalies (see Durand et al. Ocean Dynamics 2013 (tropical Indian
Ocean and IOD); Hasson et al. JGR 2014 (La Nia in tropical Pacific
Ocean)
Slide 8
8 Boutin et al., Avril 2015, SMOS-OCEAN TOSCA Further than
800km from the continents 100km-monthly SMOS SSS wrt ISAS SSS and
SMOS wrt ISAS SSSanomalies 0.2
Slide 9
9 Boutin et al., Avril 2015, SMOS-OCEAN TOSCA 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 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)!
Slide 10
10 Boutin et al., Avril 2015, SMOS-OCEAN TOSCA Biais cotiers:
non visibles sur anomalies SSS => biais systematiques =>
correction? Kolodziejczyk (LOCEAN), Vergely (ACRI-st), Martin
(LOCEAN), Marchand (LOCEAN), Boutin (LOCEAN) SMOS (Asc) ISAS SSS 4
year mean All dwells -0.6 0.6 0.
Slide 11
11 Boutin et al., Avril 2015, SMOS-OCEAN TOSCA Le biais en Tb
dpend de la position dans le FOV => biais SSS dpend de la
positions across track ~100km gauche du centre ~100km droite du
centre
Slide 12
12 Boutin et al., Avril 2015, SMOS-OCEAN TOSCA Correction
simple: on ote un Biais moyen (3ans) /ISAS