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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] |
Dye 3 W
A dye is a colored substance that chemically bonds to the substrate to which it is being applied. This distinguishes dyes from pigments which do not chemically bind to the material they color. Dye is generally applied in an aqueous solution and may require a mordant to improve the fastness of the dye on the fiber. There are two broad categories of dyes: natural and synthetic; Natural dyes are dyes extracted from plants, Insects, or minerals. The majority of natural dyes are vegetable dyes derived from plant sources such as roots, berries, bark, leaves, and wood, as well as other biological sources like fungi. Synthetic dyes are also referred to as "coal tar dyes" because they are derived from substances that, until recently, could only be extracted from coal tar. A synthetic dye consists of a chromophore and an auxochrome added to a benzene derivative. Both dyes and pigments are colored, because they absorb only some wavelengths of visible light. Dyes are usually soluble ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antarctic Ice Sheet
The Antarctic ice sheet is one of the two polar ice caps of Earth. It covers about 98% of the Antarctic continent and is the largest single mass of ice on Earth, with an average thickness of over 2 kilometers. It covers an area of almost and contains of ice. A cubic kilometer of ice weighs approximately 0.92 metric gigatonnes, meaning that the ice sheet weighs ~24,380,000 gigatonnes. It holds approximately 61% of all fresh water on Earth, equivalent to about 58 meters of sea level rise if all the ice were above sea level. In East Antarctica, the ice sheet rests on a major land mass, while in West Antarctica the bed can extend to more than 2,500 m below sea level. Satellite measurements by NASA indicate a still increasing sheet thickness above the continent, outweighing the losses at the edge. The reasons for this are not fully understood, but suggestions include the climatic effects on ocean and atmospheric circulation of the ozone hole, and/or cooler ocean surface temp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sewart Air Force Base
Sewart Air Force Base (1941–1971) is a former United States Air Force base located in Smyrna, about 25 miles southeast of Nashville, Tennessee. During World War II, it was known as Smyrna Army Airfield. History World War II The War Department ordered the construction of a Bombardment Air Base near Nashville on 22 December 1941, shortly after the US had entered World War II. A tract of land consisting of located off US Route 70 in Rutherford County, Tennessee near Smyrna, Tennessee, was selected and acquired by the United States Army Air Forces for use as an Army-Air Force Training Command Base. Six thousand workers erected 200 buildings and an airfield to accommodate the training needs of the Army Air Force. In January 1942, Smyrna Army Airfield was assigned to the AAF Southeast Training Center with the Army Air Force Pilot School (Specialized 4-Engine) activated (phase 3 pilot training). In this phase, cadets flew B-17 Flying Fortress and B-24 Liberator heavy bombers. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
C-130
The Lockheed C-130 Hercules is an American four-engine turboprop military transport aircraft designed and built by Lockheed Corporation, Lockheed (now Lockheed Martin). Capable of using unprepared runways for takeoffs and landings, the C-130 was originally designed as a troop, Medical evacuation, medevac, and Cargo aircraft, cargo transport aircraft. The versatile airframe has found uses in other roles, including as a gunship (AC-130), for airborne infantry, airborne assault, search and rescue, scientific research support, weather reconnaissance, aerial refueling, maritime patrol, and aerial firefighting. It is now the main tactical airlifter for many military forces worldwide. More than 40 variants of the Hercules, including civilian versions marketed as the Lockheed L-100, operate in more than 60 nations. The C-130 entered service with the U.S. in 1956, followed by Australia and many other nations. During its years of service, the Hercules has participated in numerous milita ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sondrestrom Air Base
Sondrestrom Air Base, originally Bluie West-8, was a United States Air Force base in central Greenland. The site is located north of the Arctic Circle and from the northeast end of Kangerlussuaq Fjord (formerly known by its Danish name ''Søndre Strømfjord''). The base is approximately west-northwest of Ravneklippen and east of Sisimiut. Following World War II, the base was briefly returned to Danish control between 9 October 1950 and 20 July 1951. The 1951 Greenland bases treaty led to the return of Sondrestrom to American control. The base was turned over to the Greenland government in 1992 and is now the civilian community of Kangerlussuaq and Kangerlussuaq Airport, although the USAF operates a small Air National Guard detachment in the former base. History Names * Established on 20 October 1941 and named Bluie West Eight (BW-8); codenamed "Bodkin" in communications. : Renamed: Sondrestromfjord Army Air Base, 1945 : Renamed: Sondrestromfjord Air Base, 25 October 194 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Global Warming
In common usage, climate change describes global warming—the ongoing increase in global average temperature—and its effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes to Earth's climate. The current rise in global average temperature is more rapid than previous changes, and is primarily caused by humans burning fossil fuels. Fossil fuel use, deforestation, and some agricultural and industrial practices increase greenhouse gases, notably carbon dioxide and methane. Greenhouse gases absorb some of the heat that the Earth radiates after it warms from sunlight. Larger amounts of these gases trap more heat in Earth's lower atmosphere, causing global warming. Due to climate change, deserts are expanding, while heat waves and wildfires are becoming more common. Increased warming in the Arctic has contributed to melting permafrost, glacial retreat and sea ice loss. Higher temperatures are also caus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arctic
The Arctic ( or ) is a polar region located at the northernmost part of Earth. The Arctic consists of the Arctic Ocean, adjacent seas, and parts of Canada (Yukon, Northwest Territories, Nunavut), Danish Realm (Greenland), Finland, Iceland, Norway, Russia ( Murmansk, Siberia, Nenets Okrug, Novaya Zemlya), Sweden and the United States (Alaska). Land within the Arctic region has seasonally varying snow and ice cover, with predominantly treeless permafrost (permanently frozen underground ice) containing tundra. Arctic seas contain seasonal sea ice in many places. The Arctic region is a unique area among Earth's ecosystems. The cultures in the region and the Arctic indigenous peoples have adapted to its cold and extreme conditions. Life in the Arctic includes zooplankton and phytoplankton, fish and marine mammals, birds, land animals, plants and human societies. Arctic land is bordered by the subarctic. Definition and etymology The word Arctic comes from the Greek word ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
72nd Parallel North
The 72nd parallel north is a circle of latitude that is 72 degrees north of the Earth's equatorial plane, in the Arctic. It crosses the Atlantic Ocean, Europe, Asia, the Arctic Ocean and North America. At this latitude, the sun is visible for 24 hours, 0 minutes during the summer solstice and Civil Twilight during the winter solstice. This is the parallel where twilight/nighttime boundary on the equinoxes. Around the world Starting at the Prime Meridian and heading eastwards, the parallel 72° north passes through: : See also *71st parallel north *73rd parallel north The 73rd parallel north is a circle of latitude that is 73 degrees north of the Earth's equatorial plane, in the Arctic. It crosses the Atlantic Ocean, Europe, Asia, the Arctic Ocean and North America. At this latitude the sun is visible for ... {{geographical coordinates, state=collapsed n72 Geography of the Arctic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
65th Parallel North
The 65th parallel north is a circle of latitude that is 65 degrees north of the Earth's equatorial plane. It crosses the Atlantic Ocean, Europe, Asia and North America. At this latitude the sun is visible for 22 hours, 4 minutes during the summer solstice and 3 hours, 35 minutes during the winter solstice. Around the world Starting at the Prime Meridian and heading eastwards, the parallel 65° north passes through: : See also *64th parallel north *66th parallel north The 66th parallel north is a circle of latitude that is 66 degrees north of the Earth's equatorial plane, about 61 km south of the Arctic Circle. It crosses the Atlantic Ocean, Europe, Asia and North America. This latitude also roughly c ... {{geographical coordinates, state=collapsed n65 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
63rd Parallel North
The 63rd parallel north is a circle of latitude that is 63 degrees north of the Earth's equatorial plane. It crosses the Atlantic Ocean, Europe, Asia and North America. At this latitude the sun is visible for 20 hours, 19 minutes during the summer solstice and 4 hours, 43 minutes during the winter solstice. Around the world Starting at the Prime Meridian A prime meridian is an arbitrary meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its anti-meridian (the 180th meridian in a 360°-system) form a great ... and heading eastwards, the parallel 63° north passes through: : See also * 62nd parallel north * 64th parallel north {{geographical coordinates, state=collapsed n63 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glaciation
A glacial period (alternatively glacial or glaciation) is an interval of time (thousands of years) within an ice age that is marked by colder temperatures and glacier advances. Interglacials, on the other hand, are periods of warmer climate between glacial periods. The Last Glacial Period ended about 15,000 years ago. The Holocene is the current interglacial. A time with no glaciers on Earth is considered a greenhouse climate state. Quaternary Period Within the Quaternary, which started about 2.6 million years before present, there have been a number of glacials and interglacials. At least eight glacial cycles have occurred in the last 740,000 years alone. Penultimate Glacial Period The Penultimate Glacial Period (PGP) is the glacial period that occurred before the Last Glacial Period. It began about 194,000 years ago and ended 135,000 years ago, with the beginning of the Eemian interglacial. Last Glacial Period The last glacial period was the most recent glacial pe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleistocene
The Pleistocene ( , often referred to as the ''Ice age'') is the geological epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was finally confirmed in 2009 by the International Union of Geological Sciences, the cutoff of the Pleistocene and the preceding Pliocene was regarded as being 1.806 million years Before Present (BP). Publications from earlier years may use either definition of the period. The end of the Pleistocene corresponds with the end of the last glacial period and also with the end of the Paleolithic age used in archaeology. The name is a combination of Ancient Greek grc, label=none, πλεῖστος, pleīstos, most and grc, label=none, καινός, kainós (latinized as ), 'new'. At the end of the preceding Pliocene, the previously isolated North and South American continents were joined by the Isthmus of Panama, causing a faunal interchange between the two reg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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