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"Greenland ice cores tell tales on
past sea level contributions"
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Date: |
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Time: |
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Thursday, 02 March 2023 |
Video-Recording for any system with MP4-support - Video.mp4 (ca. 391 Mb) |
15:15 – 16:15
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Dorthe
Dahl-Jensen
(Copenhagen University)
Abstract:
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)