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The Niels Bohr Institute is a research institute of the University of Copenhagen. The research of the institute spans astronomy, geophysics, nanotechnology, particle physics, quantum mechanics, and biophysics.
An ice core is a core sample that is typically removed from an ice sheet or a high mountain glacier. Since the ice forms from the incremental buildup of annual layers of snow, lower layers are older than upper ones, and an ice core contains ice formed over a range of years. Cores are drilled with hand augers or powered drills; they can reach depths of over two miles (3.2 km), and contain ice up to 800,000 years old.
The Eemian was the interglacial period which began about 130,000 years ago at the end of the Penultimate Glacial Period and ended about 115,000 years ago at the beginning of the Last Glacial Period. It corresponds to Marine Isotope Stage 5e. Although sometimes referred to as the "last interglacial", it was the second-to-latest interglacial period of the current Ice Age, the most recent being the Holocene which extends to the present day. The prevailing Eemian climate was, on average, around 1 to 2 degrees Celsius warmer than that of the Holocene. During the Eemian, the proportion of CO2 in the atmosphere was about 280 parts per million.
Dansgaard–Oeschger events, named after palaeoclimatologists Willi Dansgaard and Hans Oeschger, are rapid climate fluctuations that occurred 25 times during the last glacial period. Some scientists say that the events occur quasi-periodically with a recurrence time being a multiple of 1,470 years, but this is debated. The comparable climate cyclicity during the Holocene is referred to as Bond events.
Willi Dansgaard was a Danish paleoclimatologist. He was Professor Emeritus of Geophysics at the University of Copenhagen and a member of the Royal Danish Academy of Science and Letters, the Royal Swedish Academy of Sciences, the Icelandic Academy of Sciences, and the Danish Geophysical Society.
The Greenland Ice Core Project (GRIP) was a research project organized through the European Science Foundation (ESF). The project ran from 1989 to 1995, with drilling seasons from 1990 to 1992. In 1988, the project was accepted as an ESF-associated program, and the fieldwork was started in Greenland in the summer of 1989.
The Greenland Ice Sheet Project (GISP) was a decade-long project to drill ice cores in Greenland that involved scientists and funding agencies from Denmark, Switzerland and the United States. Besides the U.S. National Science Foundation (NSF), funding was provided by the Swiss National Science Foundation and the Danish Commission for Scientific Research in Greenland. The ice cores provide a proxy archive of temperature and atmospheric constituents that help to understand past climate variations.
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Dye 3 is an ice core site and previously part of the DYE section of the Distant Early Warning (DEW) line, located at in Greenland. As a DEW line base, it was disbanded in years 1990/1991.
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The Hans Egede Medal is awarded by the Royal Danish Geographical Society for outstanding services to geography, "principally for geographical studies and research in the Polar lands." It was instituted in 1916 and named after Hans Egede, a Danish missionary who established a mission in Greenland.
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Siwan Davies FLSW is a Welsh professor of Physical Geography in the department of science at Swansea University.
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Jérôme Chappellaz is a French glaciologist, geochemist and paleoclimatologist who is director of the French Polar Institute. A senior researcher at France's National Center for Scientific Research (CNRS), he is a co-founder and chairman of the Ice Memory Foundation.
A geological event is a temporary and spatially heterogeneous and dynamic (diachronous) happening in Earth history that contributes to the transformation of Earth system and the formation of geological strata. Event stratigraphy was first proposed as a system for the recognition, study and correlation of the effects of important physical or biological events on the broader stratigraphical record.
Mary Remley Albert is an American earth scientist who is a Professor of Engineering at Dartmouth College. She studies snow physics and transport phenomena. She is executive director of the US Ice Drilling Program.
References
- 1 2 3 4 Dahl-Jensen, Dorthe (2007-09-10). "Dorthe Dahl-Jensen". University of Copenhagen.
- ↑ "Niels Bohr Institute". University of Copenhagen. 2007-09-10.
- ↑ Dansgaard, W. (2004). Frozen Annals: Greenland Ice Cap Research (PDF). Odder, Denmark: Narayana Pres. p. 90. ISBN 87-990078-0-0.
1980 was the year we found two youngsters (and they each other), who should later become prominent participants in our glaciological research: Dorthe Dahl-Jensen and Jørgen Peder Steffensen, both developing very well in teaching and research, she strongest in theory, he in practice and experiment.
- ↑ Gertner, Jon (2020). The Ice at the End of the World: An Epic Journey Into Greenland's Buried Past and Our Perilous Future. US: Random House Publishing Group. p. 211. ISBN 9780812986549.
Dansgaard had an arbitrary rule that reflected the hidebound traditions of his field: no women could come to the drilling camp. But he had relented in this [Dahl-Jensen's] case.
- 1 2 "Drilling at Dye 3". Niels Bohr Institute. 12 September 2014. Retrieved 9 July 2021.
In 2007, she was appointed as head of Willi Dansgaard's old department – which is now called the 'Centre for Ice and Climate' and under her leadership it remains one of the world's leading research institutes in the climate field – moreover with a gender distribution that is almost 50/50.
- ↑ Kolbert, Elizabeth (December 30, 2001). "Ice Memory". The New Yorker. Retrieved July 7, 2021.
Steffensen...pointed out that, if you believed the climate to be inherently unstable, the last thing you'd want to do is conduct a vast unsupervised experiment on it
- ↑ NEEM community members (24 January 2013). "Eemian interglacial reconstructed from a Greenland folded ice core" (PDF). Nature. 493 (7433): 489–494. Bibcode:2013Natur.493..489N. doi:10.1038/nature11789. PMID 23344358. S2CID 4420908.
- ↑ Carrington, Damian (May 17, 2021). "Greenland ice sheet on brink of major tipping point, says study". The Guardian. Retrieved July 6, 2021.
- ↑ "Dorthe Dahl-Jensen - Louis Agassiz Medal -". European Geosciences Union (EGU). Retrieved 2015-10-24.
- ↑ member profile Archived 2015-12-22 at the Wayback Machine ; retrieved 2015-12-17
- ↑ BBVA Foundation Frontiers of Knowledge Award 2023
