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Climate Dynamics Seminar: Dr. Lily Hahn, "Role of atmosphere-ocean-ice interactions for climate and climate change"

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Event Details:

Please join us for a special seminar presented by Lily Hahn, Ph.D. The seminar will help build the research community in Climate Dynamics in the Stanford Doerr School of Sustainability.

 

Lily Hahn, Ph.D.

NOAA Climate and Global Change Postdoctoral Fellow

Scripps Institution of Oceanography


Thursday, January 23, 2025

12:00 – 1:00 PM

Y2E2 299

 

“Role of atmosphere-ocean-ice interactions for climate and climate change”

 

In this talk, Dr. Hahn will explore key mechanisms by which ocean circulation and sea ice mediate the climate response to increased greenhouse gas forcing. Dr. Hahn will first investigate how considerable intermodel spread in ocean circulation, specifically the Atlantic Meridional Overturning Circulation, impacts intermodel spread in near-future warming. Using idealized model experiments, Dr. Hahn will show that uncertainty in ocean circulation contributes substantially to uncertainty in global warming by controlling ocean heat uptake and the shortwave cloud feedback. Next, Dr. Hahn will assess the role of sea ice for Arctic climate change by disentangling the impacts of sea-ice albedo and other, non-albedo sea ice effects. Dr. Hahn will use an idealized sea-ice model to show that seasonality in Arctic warming is fundamentally driven by the increasing thermal inertia of the surface layer as sea ice melts and transitions to open ocean. Lastly, Dr. Hahn will briefly discuss additional research directions, including the causes and effects of changes in atmospheric heat and moisture transport and global impacts of extratropical forcing. This talk will highlight the importance of atmosphere-ocean-ice interactions and utility of idealized climate modelling for understanding and predicting future climate change.

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