Ocean Heat Uptake and Dynamic Sea Level : Past and Future Uncertainty
Séminaire de L. Zanna (Univ. Oxford), le Mercredi 24 Avril 2019 à 11h en salle Lliboutry
Titre : Ocean Heat Uptake and Dynamic Sea Level : Past and Future Uncertainty
The ocean absorbs a significant portion of the anthropogenic heat released in the climate system, leading to an increase in global mean sea level. Observed and projected regional patterns of heat uptake in mid- and high-latitudes are controlled in part by changes in ocean circulation. I will introduce a new reconstruction of ocean heat content starting from 1871, and together with models and direct measurements present evidence that in the mid-latitude North Atlantic : 1) Up to half of the thermosteric sea level trend since 1955 is due to ocean circulation changes ; 2) the uncertainty in dynamic sea level projections can be explained by the ocean circulation response to uncertain air-sea fluxes (rather than from ocean model uncertainty).
Laure Zanna, Univ. Oxford