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Topic: Willi Dansgaard


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In the News (Fri 16 Nov 18)

  
  Ice Memory [Long]
In the early nineteen-sixties, Willi Dansgaard, a Danish chemist, proved that the ratio between the two in rainwater was related to the temperature.
Dansgaard took samples of rain from around the world and demonstrated that, by running them through a mass spectrometer, he could in most cases arrive at the average temperature of the spot where they had fallen.
Sigfus Johnsen was a student of Dansgaard's who worked with him on the Camp Century core, and he happened to be travelling to North GRIP at the same time I was.
www.mail-archive.com /eristocracy@merrymeet.com/msg00033.html   (5647 words)

  
 Dansgaard-Oeschger events   (Site not responding. Last check: 2007-11-04)
Dansgaard - Oeschger events are rapid climate fluctuations during and at the end of the last ice age.
The processes behind the timing and amplitude of these events (as recorded in ice cores) are still unclear.
http://content.aip.org/products/esva/Dansgaard_Willi.html - Photo of Dansgaard and Oerschger in a sub ice trench at Dye-3.
pedia.newsfilter.co.uk /wikipedia/d/da/dansgaard_oeschger_events.html   (115 words)

  
 Feature Article
The European group was led mainly by Danes, many of them trained by Willi Dansgaard, one of the towering pioneers in ice-core research.
It was Dansgaard who had flatly told the U.S. National Science Foundation in the mid-1970s that getting cores from the Quelccaya Ice Cap would be impossible.
A somewhat more technical history of ice-core science and technology is to be found in Willi Dansgaard's recent memoir, Frozen Annals, Greenland Ice Sheet Research, Copenhagen, Department of Geophysics of the Niels Bohr Institute at the University of Copenhagen, 2004.
www.spectrum.ieee.org /WEBONLY/publicfeature/feb05/0205djob3.html   (1281 words)

  
 Tyler Environmental Prize   (Site not responding. Last check: 2007-11-04)
In cooperation with other laboratories, Dr. Dansgaard and his group performed the first isotopic analysis of the ice and perfected the methods to date the ice sheets and measure acidity and dust records, thus demonstrating its value as an environmental indicator.
Since that time, Dr. Dansgaard has organized or participated in 19 expeditions to the glaciers of Norway, Greenland, and Antarctica.
Dansgaard is 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.
www.usc.edu /admin/provost/tylerprize/dansgard.html   (143 words)

  
 Danske forskere   (Site not responding. Last check: 2007-11-04)
Professor Willi Dansgaard fra Geofysisk Afdeling ved Københavns Universitet er født i 1922.
Willi Dansgaards og hans medarbejderes forskning er blevet verdenskendt.
I 1995 modtog Willi Dansgaard da også Crafoord Prisen for det arbejde, som han havde været med til at sætte i gang ca.
www.fipnet.gymfag.dk /iskerner/forskere/forskere.htm   (192 words)

  
 Learning from Polar Ice Core Research
The discovery of these fluctuations, known as Dansgaard-Oeschger oscillations after the Danish and Swiss investigators who first documented them, has given rise to intense interest in their causes and speculation that current increasing levels of greenhouse gases in the atmosphere could trigger such rapid change in the coming decades.
The importance of the ice core record was recognized by the North American environmental science community in 1996, when Claude Lorius, Willi Dansgaard, and Hans Oeschger received the Tyler Prize for Environmental Achievement.
In the late 1960s and early 1970s, glaciologists Willi Dansgaard, of the University of Copenhagen, and Hans Oeschger, of the University of Bern, pioneered developing techniques for dating the ice, measuring temperature, and analyzing the chemical composition of the ice and trapped air bubbles.
pubs.acs.org /hotartcl/est/99/apr/learn.html   (2525 words)

  
 [No title]
By 1981, after a decade of tenacious labor and the invention of an ingenious new drill, they had extracted gleaming cylinders of ice ten centimeters in diameter and in total over two kilometers long.
Dansgaard's group cut out 67,000 samples, and in each sample analyzed the ratios of oxygen isotopes.
Dansgaard's group was typical in speculating about "shifts between two different quasi-stationary modes of atmospheric circulation."(53) That was the most common idea about how climate might change rapidly, harking back to the "dishpan" experiments of the 1950s.
bachlab.balbach.net /coolreading/RapidClimateChange.txt   (3775 words)

  
 NAP Skim View of:
Comparing the Dye 3 core with the Camp Century ice and with new results from lake sediments in Switzerland, Willi Dansgaard and Hans Oeschger had identified 24 episodes of abrupt change during the last ice age.
In a 1984 paper, Oeschger, Dansgaard, Chet Langway, and others observed that these events “can be linked to oceanic changes, namely advances and retreats of cold polar water in the North Atlantic Ocean.” The southward advance of polar water coincides with colder climate in Europe, they noted, and its retreat northward with a warmer Europe.
And the oxygen isotope evidence for the most recent rapid event in both cores also appeared in calcium carbonate analyses from lake sediments in Switzerland, supporting Willi Dansgaard’s view, expressed years earlier, that the Greenland ice and the European pollens were recording the same rapid cooling event—the Younger Dryas.
www.nap.edu /nap-cgi/skimit.cgi?isbn=0309093120&chap=97-112   (895 words)

  
 The CALVIN BOOKSHELF Climate Collection
Dansgaard, the Swiss climatologist Hans Oeschger, and the French climatologist Claude Lorius received the $150,000 Tyler Prize in 1996.
Dansgaard, J. White, and S. Johnsen, "The abrupt termination of the Younger Dryas climate event." Nature 339:532-534 (15 June 1989); R. Alley, D. Meese, et al., "Abrupt increase in Greenland snow accumulation at the end of the Younger Dryas event," Nature 362: 527-529 (8 April 1993).
Willi Dansgaard, S. Johnsen, H. Clausen, D. Dahl-Jensen, N. Gundestrup, C. Hammer, C. Hvidberg, J. Steffensen, A. Sveinbjörnsdottir, J. Jouzel, G. Bond, "Evidence for general instability of past climate from a 250 kyr ice core," Nature 364:218-219 (1993).
www.williamcalvin.com /bookshelf/climate.htm   (8331 words)

  
 NAP Skim View of:
Bond showed how far and wide the iceberg armadas of the Heinrich events spread across the North Atlantic and how their timing matched the cold phases of the Dansgaard-Oeschger cycles in the Greenland ice.
Willi Dansgaard quickly responded to the news from Lamont-Doherty by incorporating the North Atlantic findings into the latest Greenland data.
In 1992, Bond and an international team that included Broecker and the German marine geologist Hartmut Heinrich confirmed Heinrich’s identification of a type of abrupt climate change in the North Atlantic that seemed to be very different from the events that dominated the Greenland record.
www.nap.edu /nap-cgi/skimit.cgi?isbn=0309093120&chap=129-144   (757 words)

  
 Earth: The Living Planet   (Site not responding. Last check: 2007-11-04)
Perhaps the most intriguing discovery stemming from ice-core analysis is the fact that global warming has occurred many times over the ages.
This realization stems, in part, from the work of two European paleoclimatologists, Willi Dansgaard of the University of Copenhagen in Denmark and Hans A. Oeschger of the University of Bern in Switzerland.
In 1989, Dansgaard and Oeschger reviewed a number of earlier studies of oxygen-isotope ratios in ice cores from Greenland.
www.worldbook.com /features/earth/html/earth_climate_warming.htm   (1262 words)

  
 New Scientist: Climate change - the solar connection
Evidence from ice cores drilled in Greenland also suggests that variations in the temperature in the northern hemisphere over the past thousand years have occurred in cycles of about 80 years.
These ice cores were analysed by another Dane, Willi Dansgaard, in the early 1970s.
He was the first to use oxygen isotopes as tracers of past temperatures.
www.uwmc.uwc.edu /geography/globcat/globwarm/1991_solar.htm   (835 words)

  
 Hans Oeschger   (Site not responding. Last check: 2007-11-04)
They showed in 1979 that the atmospheric concentration of CO2 during the glacial was almost 50% lower than today.
Together with his colleagues Chester C. Langway and Willi Dansgaard, he documented a series of abrupt climate changes in the Greenland ice cores now known as Dansgaard-Oeschger events.
Hans Oeschger was deeply troubled by the potential of an increased greenhouse effect caused by the steady increase of atmospheric CO2.
www.sciencedaily.com /encyclopedia/hans_oeschger   (337 words)

  
 EHP 104-11 Forum   (Site not responding. Last check: 2007-11-04)
Willi Dansgaard of the University of Copenhagen, Claude Lorius of the French Institute of Polar Research and Technology, and Hans Oeschger of the University of Bern shared a cash prize of $150,000 and received gold medallions at an awards dinner in Los Angeles.
Encased within the caps are carbon dioxide and other gases, the dust of numerous volcanic eruptions, evidence of fierce global storms, and other traces of climate change deposited during the span of human existence.
to r.) Hans Oeschger, Claude Lorius, and Willi Dansgaard were awarded the 1996 Tyler Prize for their documentation of climate change through analysis of ice.
ehp.niehs.nih.gov /docs/1996/104-11/forum.html   (3288 words)

  
 The Royal Library - Copenhagen: Gateway to Europe   (Site not responding. Last check: 2007-11-04)
Den lagdelte is indeholder oplysninger om temperatur, nedbør og atmosfære dengang sneen lå på isens overflade.
The stratification of the ice contains information about climate descriptors such as temperature, accumulation and the atmosphere at the time when the particular snow layer was deposited on top of the ice sheet.
Willi Dansgaard (*1922) received the famous Crafoord Prize in 1995 for the development of this method of paleo-climate studies.
www.kb.dk /kultur/expo/porten/96-illus/345-r10b.htm   (134 words)

  
 Natural History and the Apocalypse
For example, Wallace S. Broecker – easily the most vigorous of the geoscientists in trying to alert the scientific community, and author of several Scientific American articles – was awarded the US National Medal of Science by President Clinton in 1996 for ‘contributions to understanding chemical changes in the ocean and atmosphere’.
The Danish ice core expert Willi Dansgaard and the British oceanographer Nicholas Shackleton received the Crafoord Prize from the Swedish Academy in 1995…Dansagaard, the Swiss climatologist Hans Oeschger and the French climatologist Claude Lorius received the $150,000 Tyler Prize in 1996.
Named by Wallace Broecker after the Danish climatologist Willi Dansgaard and the Swiss geophysicist Hans Oeschger, who pioneered the research into the phenomenon in the early 1980s.
www.austhink.org /monk/global_cooling.htm   (5411 words)

  
 Rapid Climate Change
Dansgaard's group was typical in speculating about "shifts between two different quasi-stationary modes of atmospheric circulation." (53) That was the most common idea about how climate might change rapidly, harking back to the "dishpan" experiments of the 1950s.
In 1993, Dansgaard and his colleagues reported that rapid oscillations had been common during the last interglacial warm period — enormous spikes of cooling, like a 14-degree cold snap that had struck in the span of a decade and lasted 70 years.
The Camp Century and later work is discussed in Dansgaard (2004) and interviews on GISP tape-recorded 1992-1994, records of Study of Multi-Institutional Collaborations, AIP.
www.aip.org /history/climate/rapid.htm   (10156 words)

  
 SHACKLETON, NICHOLAS - CIRS   (Site not responding. Last check: 2007-11-04)
The figure shows a part of this work: at the top is an orbital target, followed by magnetic susceptibility records from Ocean Drilling Program Sites 926 and 929 and an oxygen isotope record published by Zachos and colleagues from Site 929.
1995 Crafoord Prize, jointly with Professor Willi Dansgaard, of the University of Copenhagen, "For fundamental work on developing and applying isotope geological analysis methods for the study of climatic variations during the Quaternary period".
Nicholas Shackleton has been honoured for his fundamental analyses of deep-sea sediments for the connection between oxygen isotope variations and climatic variations, which has provided us with a global time scale and a global picture of variations in climate over the past 2.5 million years.
www.cirs-tm.org /Chercheurs/chercheurs1.php?id=537   (490 words)

  
 Part 16: More Evidence for the Ice Ages   (Site not responding. Last check: 2007-11-04)
([One geologist, Willi] Dansgaard thinks the heavy snowfalls account for the rapid build-up of the ice sheets and the consequent drop in sea level.) But these Ice Age snow samples contain almost as much O-18 as snow that had fallen thousands of years before, when the climate was milder.
At a time when superlatives are routinely used to describe the mundane, it is difficult to express the importance of two papers in this issue which present results from the new GRIP ice core in central Greenland.
Dansgaard and colleagues investigated one of the possible tracers, the oxygen isotope ratio (a proxy for atmospheric temperature) along the whole of the GRIP core (see figure).
www.geocities.com /osarsif/flood16.htm   (7830 words)

  
 Jagten på rent vand
I forskning vedrørende anvendelsen af stabile isotoper i det hydrologiske kredsløb udførte den danske geofysiker Willi Dansgaard et stort pionerarbejde (f.eks.
Dansgaard, 1954), der har resulteret i omfattende globale forsknings- og moniteringsprogrammer.
Dansgaard, W. 1954: The O18-abundance in fresh water.
www.geus.dk /publications/aarsberetning97/artikel-33-43.htm   (2791 words)

  
 The Discovery of Rapid Climate Change
The proportions of different oxygen isotopes in the layers of ice gave a fairly straightforward record of temperature.
Dansgaard et al., Science 218, 1273 (1982) [INSPEC].
Dansgaard et al., in The Late Cenozoic Glacial Ages, K. Turekian, ed., Yale U.
afgen.com /climate3.html   (4157 words)

  
 DATA FROM TWO GREENLAND ICE PROJECTS DIFFER   (Site not responding. Last check: 2007-11-04)
Representatives from the US-funded Greenland Ice Sheet Project 2 (GISP2) and the European-funded Greenland Ice-core Project (GRIP) discussed their results at the Fall Meeting of the American Geophysical Union in San Francisco.
According to Willi Dansgaard of the University of Copenhagen, the GRIP ice core shows that temperatures during the Eemian fluctuated wildly, typically by 5-7 degrees Celsius over a matter of decades.
This implies that the current interglacial period (the Holocene), is either unusually stable or is subject to the same fluctuations in climate.
newton.ex.ac.uk /aip/glimpse.txt/physnews.156.2.html   (202 words)

  
 Discover: In deep water
In just a thousand years or so it had risen and fallen by as much as a quarter.
Willi Dansgaard, the Danish researcher who had first suggested that ice cores would make good climate records, had found similar oxygen-isotope swings along the whole length of the Dye 3 core.
Dansgaard had suggested that these swings might be caused by "shifts between two different quasi-stationary modes of atmospheric circulation." But Oeschger's carbon dioxide measurements seemed to eliminate that possibility.
www.findarticles.com /p/articles/mi_m1511/is_n12_v17/ai_18938018/pg_2   (1551 words)

  
 Vance Maverick: Partial Reading
Even more interestingly, Dansgaard suggested as long ago as 1954 [1] that it would be possible to recover information about ancient climates by measuring the relative abundance of isotopes of oxygen in different glacial layers.
Finally, and most particularly, I thank J. Prynne for generously permitting us to reprint his poem here.
Dansgaard, W., S. Johnsen, J. Møller, and C.
www.dgdclynx.plus.com /lynx/lynx311.html   (3608 words)

  
 Willi Dansgaard - Result for Willi Dansgaard - Meaning of Willi Dansgaard - Definition of Willi Dansgaard - Dictionary ...   (Site not responding. Last check: 2007-11-04)
Willi Dansgaard - Result for Willi Dansgaard - Meaning of Willi Dansgaard - Definition of Willi Dansgaard - Dictionary of Meaning - www.mauspfeil.net
- Chester C. Langway and Hans Oeschger " target="_blank">http://content.aip.org/products/esva/Dansgaard_Willi.html - photo of Dansgaard, Chester C. Langway and Hans Oeschger
There you find a list of all editors and the possibility to edit the original text of the article Willi Dansgaard.
www.mauspfeil.net /Willi_Dansgaard.html   (239 words)

  
 [No title]
The most surprising results were summarized in a recent _Nature_ article, which said:[[8]221] At a time when superlatives are routinely used to describe the mundane, it is difficult to express the importance of two papers in this issue which present results from the new GRIP ice core in central Greenland.
The GRIP Project Members and Dansgaard _et al._ (pages 203 and 218, respectively) give us our first detailed look at the last interglacial period, and it is not what we expected.
[222] W. Dansgaard, _et al._, "Evidence for general instability of past climate from a 250-kyr ice-core record," _Nature_, vol.
saturniancosmology.org /files/flood/flood16.txt   (7560 words)

  
 Icecore drilling -Why do people start to drill in ice, and when did it start   (Site not responding. Last check: 2007-11-04)
With these facilities, the USA started a classified drilling through the ice, with a new type of drill.
Later Willi Dansgaard developed the technology to date the ice, and see that the temperature of the snowfall.
With that tool, you would be able to se the difference between winter and summer.
hjem.get2net.dk /svend.gundestrup/icecore_drilling.htm   (271 words)

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