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"Greenland ice cores tell tales on past sea level contributions"
Thursday, 02 March 2023
Video-Recording for any system with MP4-support
- Video.mp4 (ca. 391 Mb)
15:15 – 16:15
The Greenland Ice Sheet is reacting to climate change, and is
losing progressively more mass every year. One of our challenges in the
future is to adapt to rising sea level. Looking into the past provides
knowledge on how the ice sheets react to changing climate, and this
can be used to improve future predictions of sea level rise. The deep
ice cores from Greenland contain information on past climate that goes
back more than 130,000 years, telling tales about past abrupt climate
and sea level changes.
The last interglacial, 130,000 to 115,000 years before present, is a
key analogue for future climate. At this time, climate was 5^o C warmer
over Greenland, and global sea level was 6-9 m higher than present.All
the ice cores from Greenland show that the ice sheet survived, making
only a modest contribution to global sea level rise of approximately 2m
at this time.
Biography: Dorthe Dahl-Jensen received her PhD in Geophysics in 1988 from
the University of Copenhagen. After a post-doc position at the University
of Melbourne, she became an assistant professor at the University of
Hobart in Tasmania, and moved back to the University of Copenhagen in
1997 as associate professor, where she is a full professor since 2002.
Dahl-Jensen received numerous distinctions, including the EU Descartes
Prize (2008), the Vega medal (2008), the Amalienborgprisen (2009), the
Munch prisen (2009), the Louis Agassiz Medal (2014), the Rossby price
(2020), and the Balzan Prize (2022). She is a Member of the Royal Danish
Academy of Sciences and Letters since 2015.
Dahl-Jensen has made important contributions to the study of ice and
climate, specifically the reconstruction of climate records from ice
cores and borehole data, including ice in the solar system and the
history and evolution of the Greenland Ice Sheet. She led the North
Greenland Eemian Ice Drilling (NEEM) project, which involved a 14-nation
research team which spent four years drilling and analyzing a 2,540
m (8,330 ft) ice core reaching back to the last interglacial period
130–113 thousand years ago. They found that arctic ice melting was a
significant factor. Large-scale melting of the Greenland ice sheet has
long-term global consequences, beyond rising sea levels. It could halt
the Gulf Stream ocean current, with potential knock-on effects on the
Amazon rainforest and tropical monsoons.
Date: 2 March 2023
Venue: Oskar Klein Auditorium (FR4)
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