Willi Dansgaard (30 August 1922 – 8 January 2011) was a

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paleoclimatologist Paleoclimatology (American and British English spelling differences, British spelling, palaeoclimatology) is the study of climates for which direct measurements were not taken. As instrumental records only span a tiny part of Earth's history, the ...

. 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 Royal Swedish Academy of Sciences ( sv, Kungliga Vetenskapsakademien) is one of the Swedish Royal Academies, royal academies of Sweden. Founded on 2 June 1739, it is an independent, non-governmental scientific organization that takes special ...

, the

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, and the Danish Geophysical Society.

Early life and career

Dansgaard grew up in Copenhagen, to parents who owned an engraving shop. In 1947, he graduated from the University of Copenhagen, winning a gold medal for his thesis on X-ray dosimetry. After several years of research, including some at sites in Greenland, Dansgaard returned to the University of Copenhagen's Biophysics Laboratory, where he developed its mass spectrometer to analyse water isotopes. According to his student Jørgen Peder Steffensen:

In June 1952, Dansgaard made a discovery that came to influence the rest of his scientific career. He discovered that it was possible to determine the temperature of the precipitating clouds by analysing the stable isotopic composition of rain water. In the following 12 years, he systematically collected water samples from all over the world in collaboration with the Danish East Asia Company, contacts in Greenland, a French expedition under
Paul Emile Victor Paul may refer to: *Paul (given name), a given name (includes a list of people with that name) *Paul (surname), a list of people People Christianity *Paul the Apostle (AD c.5–c.64/65), also known as Saul of Tarsus or Saint Paul, early Chris ...
and later the
International Atomic Energy Agency The International Atomic Energy Agency (IAEA) is an intergovernmental organization that seeks to promote the peaceful use of nuclear energy and to inhibit its use for any military purpose, including nuclear weapons. It was established in 1957 ...
and World Meteorological Organization.

Overview

Dansgaard was the first paleoclimatologist to demonstrate that measurements of the trace isotopes oxygen-18 and deuterium in accumulated glacier ice could be used as an indicator of past climate. Dansgaard was the first to note deuterium excess, or a water sample's deviation from the global meteoric water line (GMWL) in ice cores. He found that the kinetic differences between hydrogen-1 and deuterium related to the temperature of source water, and the absolute humidity. He was the first scientist to extract palaeoclimatic information from the American Camp Century ice core from Greenland drilled by the US army Cold Regions Research and Engineering Laboratory (CRREL). Dansgaard also took a leading role in the drilling of the first ice core to bedrock for scientific reasons, the DYE-3 core from South Greenland, from the Camp Century. Confirming findings from the analysis of the Camp Century ice core, the DYE-3 climate profile documented the existence of rapid climate change, during and at the end of the last glacial. The repeated events of abrupt climate change during the glacial are named after Willi Dansgaard and his Swiss colleague,

Hans Oeschger Hans Oeschger (2 April 1927, Ottenbach, Switzerland, Ottenbach – 25 December 1998, Bern) was a Swiss climatologist. He founded the Division of Climate and Environmental Physics at the Physics Institute of the University of Bern in 1963 and was ...

, and are known as Dansgaard-Oeschger events.

Awards

* 1971

Hans Egede Medal 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 ...

* 1975 Swedish Society for Anthropology and Geography's

Vega medal The Swedish Society for Anthropology and Geography (SSAG; sv, Svenska Sällskapet för Antropologi och Geografi) is a scientific learned society founded in December 1877. It was established after a rearrangement of various sections of the Anthropo ...

* 1976

Seligman Crystal The Seligman Crystal is an award of the International Glaciological Society. The prize is "awarded from time to time to one who has made an outstanding scientific contribution to glaciology so that the subject is now enriched" and named after Ger ...

from the

International Glaciological Society The International Glaciological Society (IGS) was founded in 1936 to provide a focus for individuals interested in glaciology, practical and scientific aspects of snow and ice. It was originally known as the "Association for the Study of Snow an ...

* 1995

Crafoord Prize * 1996 Tyler Prize for Environmental Achievement
1996

Notes

External links

Chester C. Langway Chester is a cathedral city and the county town of Cheshire, England. It is located on the River Dee, close to the English–Welsh border. With a population of 79,645 in 2011,"2011 Census results: People and Population Profile: Chester Loca ...

and

- Dansgaard's 2005 autobiography "Frozen Annals, Greenland Ice Sheet Research"

"Carbon Dioxide Through the Ice Ages' from UCSD (archived 2004)

"History of Danish ice core research" from Niels Bohr Institute (archived 2009)
1922 births 2011 deaths Danish climatologists Paleoclimatologists Members of the Royal Swedish Academy of Sciences {{climate-bio-stub