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Salsvatnet
Salvatnet is a lake in the municipalities of Namsos and Nærøysund in Trøndelag county, Norway. With its deepest depth of , it is Norway's and Europe's second-deepest lake, after Hornindalsvatnet. Alternate sources give the depth as either or at the deepest point. The lake sits very close to the ocean, about above sea level at the surface and reaches to a depth of below sea level. It is a very large lake with an area of , a volume of , and a shoreline that is around. Salvatnet is a meromictic lake, meaning that the water is permanently stratified, often without oxygen in the lower depths (bottom water) due to density gradient and a lack of turnover. A meromictic lake often preserves records of the geologic past. The lower layer of the lake is highly saline and as a result denser than the higher levels of water. Other meromictic lakes in Norway with old seawater in the lower depths include Kilevann, Tronstadvann, Botnvatnet, Rørhopvatnet, and Rørholtfjorden. See als ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Namsos
( sma, Nåavmesjenjaelmie) is a municipality in Trøndelag county, Norway. It is part of the Namdalen region. The administrative centre of the municipality is the town of Namsos. Some of the villages in the municipality include Bangsund, Klinga, Ramsvika, Skomsvoll, Spillum, Sævik, Dun, Salsnes, Nufsfjord, Lund, Namdalseid, Sjøåsen, Statland, Tøttdalen, and Sverkmoen. The municipality is the 30th largest by area out of the 356 municipalities in Norway. Namsos is the 80th most populous municipality in Norway with a population of 15,001. The municipality's population density is and its population has decreased by 2.1% over the previous 10-year period. General information Name The first part of the name comes from the local river Namsen. The last element is ''os'', which means the " mouth of a river". Coat of arms The coat of arms was granted to the town of Namsos on 5 May 1961. They were re-granted on 21 October 1966 when the town was merged into the municip ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meromictic Lake
A meromictic lake is a lake which has layers of water that do not intermix. In ordinary, holomictic lakes, at least once each year, there is a physical mixing of the surface and the deep waters. The term ''meromictic'' was coined by the Austrian Ingo Findenegg in 1935, apparently based on the older word ''holomictic''. The concepts and terminology used in describing meromictic lakes were essentially complete following some additions by G. Evelyn Hutchinson in 1937. Characteristics Most lakes are ''holomictic''; that is, at least once per year, physical mixing occurs between the surface and the deep waters. In so-called monomictic lakes, the mixing occurs once per year; in dimictic lakes, the mixing occurs twice a year (typically spring and autumn), and in polymictic lakes, the mixing occurs several times a year. In meromictic lakes, however, the layers of the lake water can remain unmixed for years, decades, or centuries. Meromictic lakes can usually be divided into th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Lakes In Norway
This is a list of lakes and reservoirs in Norway, sorted by county. For the geography and history of lakes in that country, see Lakes in Norway, including: * List of largest lakes in Norway * List of deepest lakes in Norway Akershus *Bjørkelangen * Bogstadvannet *Dælivannet * Engervannet * Hallangen *Hurdalsjøen * Lyseren *Mangen * Mjøsa *Øgderen * Østernvann * Øyangen (Gran) *Øyeren *Rødenessjøen *Setten Aust-Agder *Åraksfjorden * Blåsjø *Botnsvatnet *Botsvatn * Breidvatn *Byglandsfjorden * Fisstøylvatnet * Grøssæ * Gyvatn *Hartevatnet *Herefossfjorden * Holmavatnet * Holmevatnet *Homstølvatnet *Hovatn *Høvringsvatnet *Kilefjorden * Kolsvatnet *Kvifjorden *Longerakvatnet *Måvatn * Myklevatnet *Nasvatn *Nelaug * Nesvatn *Nystølfjorden *Ogge *Ormsavatnet * Østre Grimevann * Øyarvatnet * Ramvatn *Reinevatn * Rore *Rosskreppfjorden * Sæsvatn *Skyvatn *Store Bjørnevatn *Store Urevatn * Straumsfjorden * Svartevatnet *Syndle *Topsæ *Uldalsåna *Vatndals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saline Water
Saline water (more commonly known as salt water) is water that contains a high concentration of dissolved salts (mainly sodium chloride). On the United States Geological Survey (USGS) salinity scale, saline water is saltier than brackish water, but less salty than brine. The salt concentration is usually expressed in parts per thousand (permille, ‰) and parts per million (ppm). The USGS salinity scale defines three levels of saline water. The salt concentration in slightly saline water is 1,000 to 3,000 ppm (0.1–0.3%); in moderately saline water is 3,000 to 10,000 ppm (0.3–1%); and in highly saline water is 10,000 to 35,000 ppm (1–3.5%). Seawater has a salinity of roughly 35,000 ppm, equivalent to 35 grams of salt per one liter (or kilogram) of water. The saturation level is only nominally dependent on the temperature of the water. At one liter of water can dissolve about 357 grams of salt, a concentration of 26.3% w/w. At boiling () the amount that can be dissolved in o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Density Gradient
Density gradient is a spatial variation in density over an area. The term is used in the natural sciences to describe varying density of matter, but can apply to any quantity whose density can be measured. Aerodynamics In the study of supersonic flight, Schlieren photography observes the density gradient of air as it interacts with aircraft. Also in the field of Computational Fluid Dynamics, Density gradient is used to observe the acoustic waves, shock waves or expansion waves in the flow field. Water A steep density gradient in a body of water can have the effect of trapping energy and preventing convection, such a gradient is employed in solar ponds. In the case of salt water, sharp gradients can lead to stratification of different concentrations of salinity. This is called a Halocline. Biology In the life sciences, a special technique called density gradient separation is used for isolating and purifying cells, viruses and subcellular particles. Variations of this include ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bottom Water
Bottom water is the lowermost water mass in a water body, by its bottom, with distinct characteristics, in terms of physics, chemistry, and ecology. Oceanography Bottom water consists of cold, dense water near the ocean floor. This water is characterized by low salinity and nutrient content. Generally, low salinity from seasonal ice melt and freshwater river output characterizes bottom water produced in the Antarctic. However, during colder months, the formation of sea ice is a crucial process that raises the salinity of bottom water through brine rejection. As saltwater freezes, salt is expelled from the ice into the surrounding water. The oxygen content in bottom water is high due to ocean circulation. In the Antarctic, salty and cold surface water sinks to lower depths due to its high density. As the surface water sinks, it carries oxygen from the surface with it and will spend an enormous amount of time circulating across the seafloor of ocean basins. Oxygen-rich water moving th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxygen
Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. Oxygen is Earth's most abundant element, and after hydrogen and helium, it is the third-most abundant element in the universe. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula . Diatomic oxygen gas currently constitutes 20.95% of the Earth's atmosphere, though this has changed considerably over long periods of time. Oxygen makes up almost half of the Earth's crust in the form of oxides.Atkins, P.; Jones, L.; Laverman, L. (2016).''Chemical Principles'', 7th edition. Freeman. Many major classes of organic molecules in living organisms contain oxygen atoms, such as proteins, nucleic acids, carbohydrates, and fats, as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
