Special ClimaTea


Wednesday, April 4, 2018, 12:00pm

Speaker:  Professor Laure Zanna from Oxford University

Title: "Ocean Heat Uptake and Dynamic Sea Level Rise: Past and Future Uncertainty".

Abstract: The ocean absorbs a significant portion of the anthropogenic heat released in the climate system, leading to an increase in global mean sea level rise. Observed and projected regional patterns of heat uptake in mid- and high-latitudes are controlled in part by changes in ocean circulation. Using a new estimate of ocean heat content estimate, direct measurements and models, I will present evidence that in the Atlantic:

1) half of the thermosteric sea level trend since 1970 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).

ohu-plot-model.pdf502 KB