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Willi Dansgaard
Willi Dansgaard (30 August 1922 – 8 January 2011) was a Denmark, 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 precipita ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Copenhagen
Copenhagen ( or .; da, København ) is the capital and most populous city of Denmark, with a proper population of around 815.000 in the last quarter of 2022; and some 1.370,000 in the urban area; and the wider Copenhagen metropolitan area has 2,057,142 people. Copenhagen is on the islands of Zealand and Amager, separated from Malmö, Sweden, by the Øresund strait. The Øresund Bridge connects the two cities by rail and road. Originally a Viking fishing village established in the 10th century in the vicinity of what is now Gammel Strand, Copenhagen became the capital of Denmark in the early 15th century. Beginning in the 17th century, it consolidated its position as a regional centre of power with its institutions, defences, and armed forces. During the Renaissance the city served as the de facto capital of the Kalmar Union, being the seat of monarchy, governing the majority of the present day Nordic region in a personal union with Sweden and Norway ruled by the Danis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 as an autonomous organization within the United Nations system; though governed by its own founding treaty, the organization reports to both the General Assembly and the Security Council of the United Nations, and is headquartered at the UN Office at Vienna, Austria. The IAEA was created in response to growing international concern toward nuclear weapons, especially amid rising tensions between the foremost nuclear powers, the United States and the Soviet Union. U.S. President Dwight D. Eisenhower's " Atoms for Peace" speech, which called for the creation of an international organization to monitor the global proliferation of nuclear resources and technology, is credited with catalyzing the formation of the IAEA, whose treaty came into ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 missionary who established a mission in Greenland. Recipients SourceRoyal Danish Geographical Society * 1921: Peter Freuchen ; Godfred Hansen ; Morten P. Porsild * 1924: Knud Rasmussen * 1925: Roald Amundsen * 1927: Lauge Koch * 1932: Henry George Watkins ; Therkel Mathiassen * 1933: Ejnar Mikkelsen ; Kaj Birket-Smith * 1937: Hans Wilhelmsson Ahlmann * 1947: Pálmi Hannesson * 1951: Eigil Knuth * 1955: Helge Larsen * 1959: Vivian Fuchs * 1960: Paul A. Siple * 1971: Willi Dansgaard ; Børge Fristrup * 1976: Knud Ellitsgaard-Rasmussen ; Jørgen Meldgaard * 1980: Bent Fredskild * 1982: Gunnar Østrem * 1984: Trevor Lloyd * 1986: Preben Gudmandsen * 1992: Niels Steen Gundestrup * 1996: Bent Hasholt ; Johannes Krüger * 2017: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 the director until his retirement in 1992. Oeschger was the first to date the "age" of Pacific deep water. The Oeschger counter was the leading instrument for many years which enabled the Oeschger's team to measure the activity of naturally occurring radioisotopes (, , , , , , ). Oeschger was a pioneer and leader in ice core research. In collaboration with his colleagues he was the first to measure the glacial-interglacial change of atmospheric . They showed in 1979 that the atmospheric concentration of 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. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abrupt Climate Change
An abrupt climate change occurs when the climate system is forced to transition at a rate that is determined by the climate system energy-balance, and which is more rapid than the rate of change of the external forcing, though it may include sudden forcing events such as meteorite impacts. Abrupt climate change therefore is a variation beyond the variability of a climate. Past events include the end of the Carboniferous Rainforest Collapse, Younger Dryas, Dansgaard-Oeschger events, Heinrich events and possibly also the Paleocene–Eocene Thermal Maximum. The term is also used within the context of climate change to describe sudden climate change that is detectable over the time-scale of a human lifetime, possibly as the result of feedback loops within the climate system or tipping points. Timescales of events described as 'abrupt' may vary dramatically. Changes recorded in the climate of Greenland at the end of the Younger Dryas, as measured by ice-cores, imply a sudden wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Greenland
The Southern Inspectorate of Greenland also known as South Greenland was a Danish inspectorate on Greenland consisting of the trading centers and missionary stations along the southwest coast of the island. Its capital was at Godthaab (modern Nuuk). The northernmost town of South Greenland was Holsteinborg, which bordered Egedesminde, which was the southernmost town of North Greenland. This boundary between South and North Greenland ran at around 68°N degree of latitude, and in the South, South Greenland stretched to 59°30'N, p. 281 ''CHAP. III-GREENLAND. or to the southernmost point of Greenland. In 1911, as the administration of the colony was removed from the |
Dye 3
Dye 3 is an ice core site and previously part of the DYE section of the Distant Early Warning (DEW) line, located at (, 2480 masl) in Greenland. As a DEW line base, it was disbanded in years 1990/1991. An ice core is a core sample from the accumulation of snow and ice that has re-crystallized and trapped air bubbles over many years. The composition of these ice cores, especially the presence of hydrogen and oxygen isotopes, provides a picture of the climate at the time. Ice cores contain an abundance of climate information. Inclusions in the snow, such as wind-blown dust, ash, bubbles of atmospheric gas and radioactive substances, remain in the ice. The variety of climatic proxies is greater than in any other natural recorder of climate, such as tree rings or sediment layers. These include (proxies for) temperature, ocean volume, precipitation, chemistry and gas composition of the lower atmosphere, volcanic eruptions, solar variability, sea-surface productivity, desert extent a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cold Regions Research And Engineering Laboratory
The Cold Regions Research and Engineering Laboratory (CRREL) is a United States Army Corps of Engineers, Engineer Research and Development Center research facility headquartered in Hanover, New Hampshire, that provides scientific and engineering support to the U.S. government and its military with a core emphasis on cold environments. CRREL also provides technical support to non-government customers. CRREL arose from a consolidation of three antecedent organizations whose purpose was to understand frozen ground, permafrost, snow and ice as factors which were important in strategic northern areas during the Cold War. In its first 25 years CRREL researchers contributed to the understanding of polar ice caps, permafrost, and the engineering technology for developing natural resources in cold climates, such as Alaska. More recently, CRREL researchers have made contributions to science in climate change, the understanding of wave propagation for sensor systems, the control of snow on s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Camp Century
Camp Century was an Arctic United States military scientific research base in Greenland. situated 240 km (150 miles) east of Thule Air Base. When built, Camp Century was publicized as a demonstration for affordable ice-cap military outposts and a base for scientific research. Camp Century was a preliminary camp for Project Iceworm whose end goal was to install a vast network of nuclear missile launch sites that could survive a first strike. This was according to documents declassified in 1996. The missiles were never fielded and necessary consent from the Danish Government to do so was never broached. The camp operated from 1959 until 1967. It consisted of 21 tunnels with a total length of , and was powered by a nuclear reactor. Project Iceworm was aborted after it was realized that the ice sheet was not as stable as originally assessed, and that the missile basing concept would not be feasible. The reactor was removed and Camp Century later abandoned. However, hazardo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrogen-1
Hydrogen (1H) has three naturally occurring isotopes, sometimes denoted , , and . and are stable, while has a half-life of years. Heavier isotopes also exist, all of which are synthetic and have a half-life of less than one zeptosecond (10−21 s). Of these, is the least stable, while is the most. Hydrogen is the only element whose isotopes have different names that remain in common use today: the (or hydrogen-2) isotope is deuterium and the (or hydrogen-3) isotope is tritium. The symbols D and T are sometimes used for deuterium and tritium. The IUPAC accepts the D and T symbols, but recommends using standard isotopic symbols ( and ) instead to avoid confusion in the alphabetic sorting of chemical formulas. The isotope , with no neutrons, is sometimes called protium. (During the early study of radioactivity, some other heavy radioactive isotopes were given names, but such names are rarely used today.) List of isotopes , - , , 1 , 0 , , colspan=3 align=c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glacier
A glacier (; ) is a persistent body of dense ice that is constantly moving under its own weight. A glacier forms where the accumulation of snow exceeds its Ablation#Glaciology, ablation over many years, often Century, centuries. It acquires distinguishing features, such as Crevasse, crevasses and Serac, seracs, as it slowly flows and deforms under stresses induced by its weight. As it moves, it abrades rock and debris from its substrate to create landforms such as cirques, moraines, or fjords. Although a glacier may flow into a body of water, it forms only on land and is distinct from the much thinner sea ice and lake ice that form on the surface of bodies of water. On Earth, 99% of glacial ice is contained within vast ice sheets (also known as "continental glaciers") in the polar regions, but glaciers may be found in mountain ranges on every continent other than the Australian mainland, including Oceania's high-latitude oceanic island countries such as New Zealand. Between lati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
