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La salinité de surface, thème fédérateur d’OLVAC

La salinité de surface, thème fédérateur d’OLVAC. Etudes s’appuyant sur le SO SSS, les satellites SMOS/Aquarius, la modélisation. Thématique présente sur tous les chantiers géographiques OLVAC, à différentes échelles spatio-temporelles, centrale dans plusieurs thèses.

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La salinité de surface, thème fédérateur d’OLVAC

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  1. La salinité de surface, thème fédérateur d’OLVAC Etudes s’appuyant sur le SO SSS, les satellites SMOS/Aquarius, la modélisation Thématique présente sur tous les chantiers géographiques OLVAC, à différentes échelles spatio-temporelles, centrale dans plusieurs thèses tendances climatiques long terme impact des fleuves dynamique IOD dynamique saisonnière circulation australe climat régional dynamique ENSO

  2. SSS ENSO-related SSS changes Eastern Pacific El Niño Central Pacific El Niño SST Different SSS anomalies near the eastern edge of WP fresh pool and under SPCZ (Singh, Delcroix & Cravatte, 2011)

  3. Associated equatorial mechanisms Mixed layer salt budget in forced model: • advection term not extending eastward of dateline in CP Niño • no eastern precipitation forcing in CP Niño • strong subsurface forcing in EP Niño 2001-2004 Central Pacific El Niño 1996-1998 Eastern Pacific El Niño pss/yr (Hasson, Delcroix & Dussin, 2013)

  4. East Pacific Fresh Pool seasonal cycle Wind/Rain JAS S M O S Surface Currents JFM Panama gap wind Upwelling SMOS can monitor the fresh pool Summer rain =>SSS minimum, fresh pool building Westward advection of fresh pool by SEC Ekman pumping => upwelling in Panama Bight, fresh pool destruction (Alory, Maes, Delcroix, Reul & Illig, 2012)

  5. Impact of river discharges in Bay of Bengal SSS with seasonal runoff + interannual runoff anomaly resulting SST anomaly Ganges + Brahmaputra 1998: strong discharge Model simulations with or without interannual runoff anomaly (Durand, Papa, Rahman & Bala, 2011)

  6. Indian Ocean Dipole SSS signature SMOS SSS 12/2011 – 12/2010 IOD+ IOD- 2010 2012 Largest year-to-year signal in SMOS data, related to IOD-/IOD+ succession Validation SMOS SSS in situ SSS WOA SSS Both data and model agree on dominant role of advection (Durand, Alory, Reul & Dussin, en cours)

  7. Tropical Atlantic SSS budget from mixed layer model Climatological model validation Seasonal balance in selected regions Dominant processes for mean state (Da-Allada, Alory, Dupenhoat, Kestenare, Durand & Hounkonnou, 2013)

  8. Interannual variations in SURVOSTRAL SubAntarctic Zone SAZ : SSS – Seasonal mean (DJFM) 1993 2000 2012 Maria Is TSG Correlation SAZ AZ Southward penetration of Tasman Sea inflow (Morrow & Kestenare, en cours)

  9. Global SSS trends (1970-2002) Obs Mean SSS • Observed trends reflect the « wet gets wetter, dry gets drier » Clausius-Clapeyron effect • Local effect + mean currents • Models capture the increasing Pacific-Atlantic contrast despite biases (double ITCZ) Obs SSS trend CMIP3 models SSS trend (Terray, Corre, Cravatte, Delcroix, Reverdin & Ribes, 2012)

  10. Bon week-end! Conclusion • Poursuivre les observations sur le long-terme (in situ + satellite) • Bonne synergie entre SO et recherche associée (CNAP) • Transversalité: cycle de l’eau, couplage océan-atmosphère...

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