Abstract
Work is in progress in the context of MyOcean in order to define ocean climate indices computed both from observations and from monitoring and forecasting system outputs. Global Ocean indicators are evaluated from a field of hydrographic in situ observations provided by the Argo array (ARIVO), from global ocean reanalyses of the French Global Ocean Reanalysis and Simulations (GLORYS) project and a current field derived from multi-parametric observed products (SURCOUF3D). The in-situ measurements are used to define ocean indicators describing the state of the global ocean and its changes over the period 2004-2008. We find global rates of 0.65±0.13 Wm-2 for heat storage, 2700±1400 km3 for freshwater content and 0.95±0.2 mm/yr for steric sea level. Changes of the deep ocean hydrographic field are assessed while determining regional linear trends of steric height and deep temperature anomalies. Areas of a positive trend of steric sea level - which contribute to the global steric rise – occur in all basins and dominate the Pacific Ocean. The global steric seal level rise is larger when evaluated from the GLORYS reanalysis temperature and salinity 3D monthly fields. Due to data assimilation of sea level anomalies, GLORYS total (barotopic and steric) mean sea level rise is very close to the satellite derived observations. Finally the intensity of the Meridional Overturning Circulation (MOC) is evaluated from SURCOUF3D and from GLORYS. Both reproduce the order of magnitude of ship cruise measurements of the MOC.
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Global Ocean Indicators - Von Schuckmann & al. 278.29 kB