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À partir de l'équation du bilan du niveau de la mer, la variation thermostérique du niveau de la mer est calculée selon  :
ΔSLthermosteric = ΔSLtotal - ΔSLmass - ΔSLhalosteric
Avec ΔSLtotal : à partir de données d'altimétrie spatiale provenant du Copernicus Climate Change Service.
ΔSLmass : données de Gravimétrie spatiale de GRACE(-FO), mise à jour de Blazquez et al. 2018
ΔSLhalosteric : données in situ, à partir d'Argo, combinaison de ISAS20 (0-2000m) et EN4.2.2.l09 (en-dessous de 2000m)

La variation de l'OHC est calculée à l'échelle régionale en divisant la variation thermostérique du niveau de la mer par le coefficient d'efficacité d'expansion intégrée de la chaleur (IEEH) : elle exprime la variation de la densité de l'océan due à l'absorption de chaleur et est estimée à partir des mesures in situ de la température et de la salinité. Les incertitudes sur les changements de l'OHC sont estimées par propagation des incertitudes à partir des données d'entrée jusqu'au changement de l'OHC. 

Des activités de validation ont été menées dans la région de l'Atlantique Nord subtropical (SPNA) (Figure 4) et dans la région de l'Atlantique Nord subpolaire (SNA) (Figure 5) avec des données in situ Argo. De plus, l'utilisation de données in situ des sections de mouillage RAPID et A25-OVIDE met en évidence une bonne cohérence des tendances de l'OHC avec le produit géodésique spatial.

Références:
Ablain et al., OSTST 2022: Monitoring the regional heat content change over the Atlantic Ocean with the space geodetic approach: the 4DATLANTIC-OHC project. https://doi.org/10.24400/527896/a03-2022.3417

Blazquez, A., Meyssignac, B., Lemoine, J., Berthier, E., Ribes, A. and Cazenave, A. (2018) Exploring the uncertainty in GRACE estimates of the mass redistributions at the Earth surface: implications for the global water and sea level budgets, Geophys. J. Int., 215(1), 415–430,  https://doi.org/10.1093/gji/ggy293

Marti, F., Blazquez, A., Meyssignac, B., Ablain, M., Barnoud, A., Fraudeau, R., Jugier, R., Chenal, J., Larnicol, G., Pfeffer, J., Restano, M., and Benveniste, J.(2021) : Monitoring the ocean heat content change and the Earth energy imbalance from space altimetry and space gravimetry, Earth Syst. Sci. Data Discuss., 1–32, https://doi.org/10.5194/essd-2021-220 .

Meyssignac, B., Boyer, T., Zhao, Z., Hakuba, M. Z., Landerer, F. W., Stammer, D., Köhl, A., Kato, S., L’Ecuyer, T., Ablain, M., Abraham, J. P., Blazquez, A., Cazenave, A., Church, J. A., Cowley, R., Cheng, L., Domingues, C. M., Giglio, D., Gouretski, V., Ishii, M., Johnson, G. C., Killick, R. E., Legler, D., Llovel, W., Lyman, J., Palmer, M. D., Piotrowicz, S., Purkey, S. G., Roemmich, D., Roca, R., Savita, A., Schuckmann, K. von, Speich, S., Stephens, G., Wang, G., Wijffels, S. E., Zilberman, N. (2019) Measuring Global Ocean Heat Content to Estimate the Earth Energy Imbalance, Front. Mar. Sci., 6, doi: https://doi.org/10.3389/fmars.2019.00432, 2019.</gco:CharacterString>
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