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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



                                      Dorthe Dahl-Jensen

                                                 (Copenhagen University)



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

Time: 15:15

Venue: Oskar Klein Auditorium (FR4)


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