Monitoring the regional Ocean Heat Content change over the Atlantic Ocean with the space geodetic approach ...

• Main Authors: Rousseau, Victor, Fraudeau, Robin, Hammond, Matthew, Houndegnonto, Odilon Joël, Ablain, Michaël, Blazquez, Alejandro, Mir Calafat, Fransisco, Desbruyères, Damien, Foti, Giuseppe, Llovel, William, Marti, Florence, Meyssignac, Benoît, Restano, Marco, Benveniste, Jérôme
• Format: Conference Object
• Language: unknown
• Published: CNES 2023
• Subjects: North Atlantic
• Online Access: https://dx.doi.org/10.24400/527896/a03-2023.3769; https://ostst.aviso.altimetry.fr/programs/abstracts-details.html?tx_ausyclsseminar_pi2[objAbstracte]=3769&cHash=X

Given the major role of the Atlantic Ocean in the climate system, it is essential to characterize the temporal and spatial variations in its heat content. Here we present the method developed and the results obtained as part of the ESA-supported 4DAtlantic-OHC project (2021-2023). The method developed is based on space geodetic data from satellite altimetry and GRACE. In addition, Argo's in situ measurements are used to estimate and correct the estimated salinity variations. The uncertainties were estimated rigorously by propagating uncertainties from space geodetic data to the OHC change. The results obtained show a total OHC change over the Atlantic basin of 0.17 W/m² which represents 21% of the global OHC trend, with significant trends observed in 52% of the Atlantic basin. Uncertainties in OHC trends are mainly attributed to manometric sea level change uncertainties. We validated our space geodetic OHC estimates at two test sites, representing the subtropical and subpolar regions of the North Atlantic, ...