science

Willi Dansgaard

Willi Dansgaard is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Willi Dansgaard rather than just read about it. In short: Willi Dansgaard (30 August 1922 – 8 January 2011) 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.

Key takeaways

Willi Dansgaard belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Willi Dansgaard to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Willi Dansgaard from memory before moving on to harder problems.

Reference excerpt

Willi Dansgaard (30 August 1922 – 8 January 2011) 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.

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 and later the International Atomic Energy Agency 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, 1,400 kilometres (870 mi) 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, and are known as Dansgaard–Oeschger events.

Awards 1971 Hans Egede Medal 1975 Swedish Society for Anthropology and Geography's Vega medal 1976 Seligman Crystal from the International Glaciological Society 1995 Royal Swedish Academy of Sciences Crafoord Prize 1996 Tyler Prize for Environmental Achievement, 1996

Notes

External links - photo of Dansgaard, Chester C. Langway and Hans Oeschger - 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)

Worked examples

Example 1 — a first encounter with Willi Dansgaard

Start with the simplest possible case. Write down what Willi Dansgaard claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Willi Dansgaard before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Willi Dansgaard ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Willi Dansgaard

In research: Willi Dansgaard appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Willi Dansgaard in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Willi Dansgaard is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1922 births, 2011 deaths, Atmospheric scientist stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Willi Dansgaard outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Willi Dansgaard in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Willi Dansgaard means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Willi Dansgaard out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Willi Dansgaard in simple terms?

Why does Willi Dansgaard matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Willi Dansgaard?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Willi Dansgaard.