Environmental Science and Engineering Seminar

Wednesday January 24, 2018 4:00 PM

Ocean Heat Uptake and Dynamical Sea Level Rise: Past and Future Uncertainty

Speaker: Laure Zanna, Department of Physics, University of Oxford
Location: South Mudd 365

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. The patterns and rate of ocean heat uptake are governed by several processes such as air-sea interaction, and deep water formation. However, heat redistribution via changes in ocean circulation further impacts the spatial patterns of heat storage induced by natural variability and anthropogenic forcing.

Using a combination of observations, theory, and models,  we attribute about half of the thermosteric sea level change, in the past 50 years  at 40N, to ocean circulation changes - likely induced by air-sea variability.  We further explore the link between air-sea fluxes, ocean circulation changes, and heat uptake in future projections. Our findings highlight high-latitude forcing as the leading cause of regional sea level projection uncertainty, over the parametrization of ocean processes. We propose ways forward to constrain regional projections of ocean heat uptake and sea level rise, including the use of anthropogenic carbon.

Series Environmental Science and Engineering Seminar

Contact: Kathy Bravo at 626-395-8732 kbravo@gps.caltech.edu