The Weddell Polynya: when will it come back?

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• Casimir de Lavergne, LOCEAN, Sorbonne University
• Tuesday 09 June 2020, 11:00-12:00
• British Antarctic Survey, Zoom.

If you have a question about this talk, please contact Louis Couston.

The talk will be online. Contact the host to get Zoom details.

In the mid 1970s, an area the size of Italy remained ice free for three winters in a row in the central Weddell Sea near Antarctica, despite atmospheric temperatures under -20ºC. This massive climatic anomaly, called the Weddell Polynya, has not recurred since. Recently, evidence for an impact of anthropogenic emissions on such climatic events, and furtive openings of the winter ice pack in the region, reignited interest in past and future occurrences of the Polynya. In this talk, I will discuss factors controlling polynya formation in the subpolar Southern Ocean and their projected evolution. Implications in the context of current observed trends in Southern Hemisphere climate will be evoked.

This talk is part of the British Antarctic Survey - Polar Oceans seminar series series.

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