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A lake is an area filled with water, localized in a basin, surrounded by land, apart from any
river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Sm ...
or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the
ocean The ocean (also the sea or the world ocean) is the body of salt water which covers approximately 71% of the surface of the Earth.
, although like the much larger oceans, they form part of earth's
water cycle
water cycle
. Lakes are distinct from lagoons which are generally coastal parts of the ocean. They are generally larger and deeper than ponds, which also lie on land, though there are no official or scientific definitions. Lakes can be contrasted with
river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Sm ...
s or streams, which are usually flowing in a channel on land. Most lakes are fed and drained by rivers and streams. Natural lakes are generally found in mountainous areas, rift zones, and areas with ongoing glaciation. Other lakes are found in endorheic basins or along the courses of mature rivers, where a river channel has widened into a basin. In some parts of the world there are many lakes because of chaotic drainage patterns left over from the last Ice Age. All lakes are temporary over geologic time scales, as they will slowly fill in with sediments or spill out of the basin containing them. Many lakes are artificial and are constructed for industrial or agricultural use, for hydro-electric power generation or domestic water supply, or for aesthetic, recreational purposes, or other activities.


Etymology, meaning, and usage of "lake"

The word ''lake'' comes from
Middle English Middle English (abbreviated to ME) was a form of the English language spoken after the Norman conquest of England, Norman conquest (1066) until the late 15th century. English language underwent distinct variations and developments following the O ...
''lake'' ("lake, pond, waterway"), from
Old English Old English (, ), or Anglo-Saxon, is the earliest recorded form of the English language English is a West Germanic languages, West Germanic language first spoken in History of Anglo-Saxon England, early medieval England, which has eventu ...
''lacu'' ("pond, pool, stream"), from
Proto-Germanic Proto-Germanic (abbreviated PGmc; also called Common Germanic) is the reconstructed proto-language of the Germanic branch of the Indo-European languages The Indo-European languages are a language family native to western and southern Eu ...
*''lakō'' ("pond, ditch, slow moving stream"), from the
Proto-Indo-European Proto-Indo-European (PIE) is the theorized common ancestor of the Indo-European language family. Its proposed features have been derived by linguistic reconstruction from documented Indo-European languages. No direct record of Proto-Indo-Europ ...
root *''leǵ-'' ("to leak, drain"). Cognates include Dutch ''laak'' ("lake, pond, ditch"), Middle Low German ''lāke'' ("water pooled in a riverbed, puddle") as in: :de:Wolfslake, :de:Butterlake, German language, German ''Lache'' ("pool, puddle"), and Icelandic language, Icelandic ''lækur'' ("slow flowing stream"). Also related are the English words ''leak'' and ''leach''. There is considerable uncertainty about defining the difference between lakes and ponds, and no current internationally accepted definition of either term across scientific disciplines or political boundaries exists. For example, limnologists have defined lakes as water bodies which are simply a larger version of a pond, which can have wave action on the shoreline or where wind-induced turbulence plays a major role in mixing the water column. None of these definitions completely excludes ponds and all are difficult to measure. For this reason, simple size-based definitions are increasingly used to separate ponds and lakes. Definitions for ''lake'' range in minimum sizes for a body of water from to (see also the Pond#Technical definitions, definition of "pond"). Charles Sutherland Elton, Charles Elton, one of the founders of ecology, regarded lakes as waterbodies of or more. The term ''lake'' is also used to describe a feature such as Lake Eyre, which is a dry basin most of the time but may become filled under seasonal conditions of heavy rainfall. In common usage, many lakes bear names ending with the word ''pond'', and a lesser number of names ending with ''lake'' are in quasi-technical fact, ponds. One textbook illustrates this point with the following: "In Newfoundland, for example, almost every lake is called a pond, whereas in Wisconsin, almost every pond is called a lake." One hydrology book proposes to define the term "lake" as a body of water with the following five characteristics: * it partially or totally fills one or several basins connected by straits * has essentially the same water level in all parts (except for relatively short-lived variations caused by wind, varying ice cover, large inflows, etc.) * it does not have regular intrusion of seawater * a considerable portion of the sediment suspended in the water is captured by the basins (for this to happen they need to have a sufficiently small inflow-to-volume ratio) * the area measured at the mean water level exceeds an arbitrarily chosen threshold (for instance, one hectare) With the exception of the seawater intrusion criterion, the others have been accepted or elaborated upon by other hydrology publications.


Distribution

The majority of lakes on Earth are fresh water, freshwater, and most lie in the Northern Hemisphere at higher latitudes. Canada, with a Drainage system (geomorphology)#Deranged drainage pattern, deranged drainage system, has an estimated 31,752 lakes larger than and an unknown total number of lakes, but is estimated to be at least 2 million. Finland has 187,888 lakes or larger, of which 56,000 are large ( or larger). Most lakes have at least one natural outflow in the form of a
river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Sm ...
or stream, which maintain a lake's average level by allowing the drainage of excess water. Some lakes do not have a natural outflow and lose water solely by evaporation or underground seepage or both. They are termed endorheic lakes. Many lakes are artificial and are constructed for hydro-electric power generation, aesthetic purposes, recreational purposes, industrial use, agricultural use or domestic water supply. Evidence of extraterrestrial lakes exists; "definitive evidence for the presence of lakes" was announced by NASA as returned by the Cassini–Huygens, Cassini Probe observing the moon Titan (moon), Titan, which orbited the planet Saturn. Globally, lakes are greatly outnumbered by ponds: of an estimated 304 million standing water bodies worldwide, 91% are or less in area (see definition of Pond#Technical definitions, ponds). Small lakes are also much more numerous than large lakes: in terms of area, one-third of the world's standing water is represented by lakes and ponds of or less. However, large lakes account for much of the area of standing water with 122 large lakes of 1,000 square kilometres (390 sq mi, 100,000 ha, 247,000 acres) or more representing about 29% of the total global area of standing inland water.


Types

In 1957, HutchinsonHutchinson, G.E. (1957). ''A treatise on limnology'', v. 1. Geography, Physics and Chemistry.Wiley. published a monograph that is regarded as a landmark discussion and classification of all major lake types, their origin, morphometric characteristics, and distribution.Cohen, A.S. (2003). ''Paleolimnology: the history and evolution of lake systems''. Oxford University Press.Håkanson, L., and Jansson, J. (1983). ''Principles of Lake Sedimentology''. Springer-Verlag, New York. Håkanson, L. (2012). "Lakes on Earth, Different Types". In ''Encyclopedia of Lakes and Reservoirs''. pp. 471–472. Springer Netherlands. Hutchinson presented in it a comprehensive analysis of the origin of lakes and proposed what is a widely accepted classification of lakes according to their origin. This classification recognizes 11 major lake types that are divided into 76 subtypes. The 11 major lake types are tectonic lakes, volcanic lakes, landslide lakes, glacial lakes, solution lakes, fluvial lakes, aeolian lakes, shoreline lakes, organic lakes, anthropogenic lakes, and meteorite (extraterrestrial impact) lakes.


Tectonic lakes

Tectonic lakes are lakes formed by the deformation and resulting lateral and vertical movements of the Earth's crust. These movements include faulting, tilting, folding, and warping. Some of the well-known and largest lakes on Earth are rift lakes occupying rift valleys, e.g. Central African Rift lakes and Lake Baikal. Other well-known tectonic lakes, Caspian Sea, the Sea of Aral, and other lakes from the Pontocaspian occupy basins that have been separated from the sea by the tectonic uplift of the sea floor above sea level. Often, the tectonic action of crustal extension has created an alternating series of parallel grabens and Horst (geology), horsts that form elongate basins alternating with mountain ranges. Not only does this promote the creation of lakes by the disruption of preexisting drainage networks, it also creates within arid regions endorheic basins that containing Salt lake (geography), salt lakes (also called saline water, saline lakes). They form where there is no natural outlet, a high evaporation rate and the drainage surface of the water table has a higher-than-normal salt content. Examples of these salt lakes include Great Salt Lake and the Dead Sea. Another type of tectonic lake caused by faulting is sag ponds.


Volcanic lakes

Volcanic lakes are lakes that occupy either local depressions, e.g. craters and maars or larger basins, e.g. calderas, created by volcanism. Volcanic crater lake, Crater lakes are formed in volcanic craters and calderas, which fill up with precipitation more rapidly than they empty via either evaporation, groundwater discharge, or combination of both. Sometimes the latter are called caldera lakes, although often no distinction is made. An example is Crater Lake in Oregon, in the caldera of Mount Mazama. The caldera was created in a massive volcanic eruption that led to the subsidence of Mount Mazama around 4860 BCE. Other volcanic lakes are created when either rivers or streams are dammed by lava flows or volcanic lahars. The basin which is now Malheur Lake, Oregon was created when a lava flow dammed the Malheur River.


Glacial lakes

Glacial lakes are lakes created by the direct action of glaciers and continental ice sheets. A wide variety of glacial processes create enclosed basins. As a result, there are a wide variety of different types of glacial lakes and it is often difficult to define clear-cut distinctions between different types of glacial lakes and lakes influenced by other activities. The general types of glacial lakes that have recognized are lakes in direct contact with ice; glacially carved rock basins and depressions; morainic and outwash lakes; and glacial drift basins. Glacial lakes are the most numerous lakes in the world. Most lakes in northern Europe and North America have been either influenced or created by the latest, but not last, glaciation, to have covered the region. Glacial lakes include proglacial lakes, subglacial lakes, finger lakes, and epishelf lakes. Epishelf lakes are highly stratified lakes in which a layer of freshwater, derived from ice and snow melt, is dammed behind an ice shelf that is attached to the coastline. They are mostly found in Antarctica.


Fluvial lakes

Fluvial (or riverine) lakes are lakes produced by running water. These lakes include Plunge pool, plunge pool lakes, fluviatile dams and meander lakes.


Oxbow lakes

The most common type of fluvial lake is a crescent-shaped lake called an ''oxbow lake'' due to the distinctive curved shape. They can form in river valleys as a result of meandering. The slow-moving river forms a sinuous shape as the outer side of bends are eroded away more rapidly than the inner side. Eventually a horseshoe bend is formed and the river cuts through the narrow neck. This new passage then forms the main passage for the river and the ends of the bend become silted up, thus forming a bow-shaped lake.


Fluviatile dams

These form where sediment from a tributary blocks the main river.


Lateral lakes

These form where sediment from the main river blocks a tributary, usually in the form of a Levee#Natural examples, levee.


Solution lakes

A solution lake is a lake occupying a basin formed by surface dissolution of bedrock. In areas underlain by soluble bedrock, its solution by precipitation and percolating water commonly produce cavities. These cavities frequently collapse to form sinkholes that form part of the local karst topography. Where groundwater lies near the grounds surface, a sinkhole will be filled water as a solution lake. If such a lake consists of a large area of standing water that occupies an extensive closed depression in limestone, it is also called a karst lake. Smaller solution lakes that consist of a body of standing water in a closed depression within a karst region are known as ''karst ponds.''Neuendorf, K.K.E., Mehl Jr., J.P., and Jackson, J.A. (2005). ''Glossary of Geology,'' 5th revised and enlarged ed. Berlin: Springer. Approx. . Limestone caves often contain pools of standing water, which are known as ''underground lakes.'' Classic examples of solution lakes are abundant in the karst regions at the Dalmatia, Dalmatian coast of Croatia and within large parts of Florida.


Landslide lakes

Landslide lakes are lakes created by the Landslide dam, blockage of a valley by either mudflows, rockslides, or screes. Such lakes are common in mountainous regions. Although landslide lakes may be large and quite deep, they are typically short-lived. An example of a landslide lake is Quake Lake, which formed as a result of the 1959 Hebgen Lake earthquake.Myers, W.B. and Hamilton, W. (1964)
The Hebgen Lake, Montana, earthquake of August 17, 1959
''Geological Survey Professional Paper'', 435, p. 51.


Aeolian lakes

Aeolian lakes are lakes produced by wind action. They are found mainly in arid environments although some aeolian lakes are Relict (geology), relict landforms indicative of arid paleoclimates. Aeolian lakes consist of lake basins dammed by wind-blown sand; interdunal lakes that lies between well-oriented sand dunes; and deflation basins formed by wind action under previously arid paleoenvironments. Moses Lake, Washington, is an example of a lake basins dammed by wind-blown sand.


Shoreline lakes

Shoreline lakes are generally lakes created by blockage of estuaries or by the uneven accretion of beach ridges by longshore and other currents. They include maritime coastal lakes, ordinarily in drowned estuaries; lakes enclosed by two tombolos or spits connecting an island to the mainland; lakes cut off from larger lakes by a bar; or lakes divided by the meeting of two spits.


Organic lakes

Organic lakes are lakes created by the actions of plants and animals. On the whole they are relatively rare in occurrence and quite small in size. In addition, they typically ephemeral features relative to the other types of lakes. The basins in which organic lakes occur are associated with beaver dams, coral lakes, or dams formed by vegetation.


Peat lakes

Peat lakes are a form of organic lake. They form where a buildup of partly decomposed plant material in a wet environment leaves the vegetated surface below the water table for a sustained period of time. They are often low in nutrients and mildly acidic, with bottom waters low in dissolved oxygen.


Anthropogenic lakes

Anthropogenic lakes are artificially created lakes formed by human activity. They can be the result of intentional damming of rivers and streams or subsequent filling of abandoned excavations by either ground water, precipitation, or a combination of both.


Meteorite (extraterrestrial impact/ crater) lakes

Meteorite lakes, which are also known as crater lakes, are lakes created by catastrophic Impact event, extraterrestrial impacts by either meteorites or asteroids. Examples of meteorite lakes are Lonar crater lake, India, Lake Elgygytgyn, and Pingualuit crater lake, Quebec, Canada, As in case of Lake El'gygytgyn and Pingualuit crater lake, meteorite (extraterrestrial impact/ crater) lakes can contain unique and scientifically valuable sedimentary deposits associated with long records of paleoclimatic changes.


Other types

In addition to mode of origin, lakes have been named and classified in various other ways according to their thermal stratification, salinity, relative seasonal permanence, degree of outflow, and other factors. Also, different cultures and regional of the world have their popular nomenclature


Types of lakes according to thermal stratification

In addition to their origin, there are various other ways of either naming or defining types of lakes. One major way of classification lakes in on the basis of thermal stratification because it is a major control on animal and plant life inhabiting a lake and the fate and distribution of dissolved and suspended material in a lake. For example, the thermal stratification and the degree and frequency of mixing exerts a strong control on the distribution of oxygen within it. In addition, lake can be classified according important factors such as seasonal variations in lake volume and level, oxygen saturation, and salinity of its water mass. Finally, the names of types of lakes that are used by the lay public and in the scientific for different types of lakes are often informally derived from either from their morphology of other aspects or their physical characteristics. F.A. Forel,Forel, F.A., 1901. ''Handbuch der Seenkunde. Allgemeine Limnologie.'' J. von Engelhorn, Stuttgart, Germany. who is also referred to as the father of limnology, was the first scientist to classify lakes according to their Lake stratification, thermal stratification. His system of classification was later modified and improved upon by Hutchinson and Laffler. Because the density of water varies with temperature, with a maximum at +4 DC, thermal stratification is an important physical characteristic of lakes that controls the fauna and flora, sedimentation, chemistry, and other aspects of individual lakes. First, the colder, heavier water typically forms a layer near the bottom, which called the ''hypolimnion''. Second, normally overlying it is a transition zone known as the ''metalimnion''. Finally, overlying the metalimnion is a surface layer of a warmer, lighter water is called the ''epilimnion''. However, this ''typical'' stratification sequence can vary widely depending either on the specific lake, the time of season, or combination of both. Based upon thermal stratification, lakes are classified as either holomictic lakes or meromictic lakes. A meromictic lake is a lake which has layers of water which do not intermix. The deepest layer of water in such a lake does not contain any dissolved oxygen. In addition, the layers of sediment at the bottom of a meromictic lake remain relatively undisturbed because there are no living aerobic organisms. The lack of disturbance allows for the development of lacustrine varves. A Holomictic lake is a lake that has a uniform temperature and density from top to bottom at a specific time during the year. This uniformity temperature and density in allows the lake waters to completely mix. Holomictic lakes are non-meromictic lakes. Based upon thermal stratification and frequency of turnover, holomictic lakes are divided into amictic lakes, monomictic lake, cold monomictic lakes, dimictic lakes, monomictic lake, warm monomictic lakes, polymictic lakes, and oligomictic lakes. The classification of lakes by thermal stratification presupposes lakes with sufficient depth to form a hypolimnion. As a results, very shallow lakes are excluded this classification system. The stratification in a lake is not always the result of variation to density because of thermal gradients. Stratification within a lake can also be the result of differences in density resulting from gradients in salinity. In case of a difference in salinity, the hypolimnion and epilimnion are separated not by a thermocline but by a halocline, which is sometimes referred to as a ''chemocline''.


Types of lake according to seasonal variation of lake level and volume

Lakes are informally classified and named according to the seasonal variation in their lake level and volume. Some of the names include: * Ephemeral lake is a short-lived lake or pond. If it fills with water and dries up (disappears) seasonally it is known as an ''intermittent lake''Poehls, D.J. and Smith, G.J. eds. (2009). ''Encyclopedic dictionary of hydrogeology.'' Academic Press. p. 517. They often fill poljes. * Dry lake is a popular name for an ephemeral lake that contains water only intermediately at irregular and infrequent intervals.Last, W.M. and Smol, J.P. (2001). ''Tracking environmental change using lake sediments. Volume 1: basin analysis, coring, and chronological techniques.'' Springer Science & Business Media. * Perennial lake is a lake that has water in its basin throughout the year and is not subject to extreme fluctuations in level.Gangstad, E.O., (1979)
''Glossary of Biolimnological Terms''
Washington, DC, United States Army Corps of Engineers.
* Playa lake is a typically shallow, intermittent lake that covers or occupies a playa either in wet seasons or in especially wet years but subsequently drying up in an arid or semiarid region. * Vlei is a name used in South Africa for a shallow lake which varies considerably in level with the seasons.Theal, G.M., 1877. ''Compendium of South African history and geography, 3rd.'' Institution Press, Lovedale, South Africa.


Types of lake according to water chemistry

Lakes are also informally classified and named according to the general chemistry of their water mass. Some of the types of lakes include: * An acid lake is a lake that has a pH is below neutral (<6.5). A lake is considered highly acidic when the pH drops below 5.5, below which when biological consequences occur. Such lakes include acid pit lakes occupying abandoned mines and excavations; naturally acid lakes of igneous and metamorphic landscapes; peat bogs in northern regions; acid-saline lakes of arid environments; crater lakes of active and dormant volcanoes; and lakes acidified by acid rain.Geller, W. et al. (eds.) (2013). ''Acidic Pit Lakes, Environmental Science and Engineering'', Springer-Verlag Berlin HeidelbergRouwet, D. et al. (eds.) (2015). ''Volcanic Lakes, Advances in Volcanology,'' Springer-Verlag Berlin Heidelberg * A salt lake, which also known as a ''brine lake'', is an inland body of water situated in an arid or semiarid region, having no outlet to the sea, and containing a high concentration of dissolved salts (principally sodium chloride). Examples include the Great Salt Lake in Utah, and the Dead Sea in the Near East. * alkali sink, also known as salt flats, are lakes on the other extreme of the scale from the large and deep saline lakes. They are, shallow saline features that occupy low-lying areas of the arid regions and in groundwater discharge zones. These are typically classifiable as either playas or playa lakes because they are periodically flooded by either rain or flood events and then dry up during drier intervals, leaving accumulations of brines and evaporitic minerals. * A Salt pan (geology), salt pan (saltpan) is either an undrained small shallow natural depression in which water accumulates and evaporates leaving a salt deposit or the shallow lake of brackish water occupying a salt pan. This term is also used for a large pan for recovering salt by evaporation. * A saline pan is a name for an ephemeral saline lake which precipitates a bottom crust that is subsequently modified during subaerial exposure.


Lakes composed of other liquids

* Lava lake is a large volume of molten lava, usually basaltic, contained in a volcanic vent, crater, or broad depression. * Lakes of Titan, Hydrocarbon lakes are bodies of liquid ethane and methane that occupy depressions on the surface of Titan (moon), Titan. They were detected by the Cassini–Huygens space probe.


Paleolakes

A paleolake, also spelt palaeolake, is a lake that existed in the past when hydrological conditions were different.Cohen, A. S. (2003). ''Paleolimnology. History and Evolution of Lake Systems.'' Oxford University Press, Oxford. Quaternary paleolakes can often be identified on the basis of Relict (geology), relict lacustrine landforms such as relict lake plains and coastal landforms that form recognizable relict shorelines, which are called ''paleoshorelines.'' Paleolakes can also be recognized by characteristic sedimentary deposits that accumulated in them and any fossils that these sediments might contain. The paleoshorelines and sedimentary deposits of paleolakes provide evidence for prehistoric hydrological changes during the times that they existed.Goudie, A. (2008). "Arid Climates and Indicators". Gornitz, V. ed., ''Encyclopedia of paleoclimatology and ancient environments''. Springer Science & Business Media. pp. 45–51. Types of paleolakes include: * A :Former lakes, former lake is a lake which is no longer in existence. Such lakes include prehistoric lakes and lakes which have permanently dried up often as the result of either evaporation or human intervention. Owens Lake in California, USA, is an example of a former lake. Former lakes are a common feature of the Basin and Range Province, Basin and Range area of southwestern North America. * A shrunken lake is a lake which has drastically decreased in size over geological time. Lake Agassiz, which once covered much of central North America, is a good example of a shrunken lake. Two notable remnants of this lake are Lake Winnipeg and Lake Winnipegosis. Paleolakes are of scientific and economic importance. For example, Quaternary paleolakes in semidesert basins are important for two reasons. First, they played an extremely significant, if transient, role in shaping the floors and piedmont (geography), piedmonts of many basins. Finally, their sediments contain enormous quantities of geologic and paleontologic information concerning past environments. In addition, the organic-rich deposits of pre-Quaternary paleolakes are important either for the thick deposits of oil shale and shale gas that they contain or as source rocks of petroleum and natural gas. Although of significantly less economic importance, strata deposited along the shore of paleolakes sometimes contain coal seams.Gierlowski-Kordesch, E. and Kelts, K.R. eds. (2000). ''Lake Basins Through Space and Time''. AAPG Studies in Geology 46 (No. 46). The American Association of Petroleum Geologists, Tulsa, OK


Characteristics

, New Zealand Lakes have numerous features in addition to lake type, such as drainage basin (also known as catchment area), inflow and outflow, nutrient content, dissolved oxygen, water pollution, pollutants, pH, and sedimentation. Changes in the level of a lake are controlled by the difference between the input and output compared to the total volume of the lake. Significant input sources are precipitation onto the lake, runoff carried by streams and channels from the lake's drainage basin, catchment area, groundwater channels and aquifers, and artificial sources from outside the catchment area. Output sources are evaporation from the lake, surface and groundwater flows, and any extraction of lake water by humans. As climate conditions and human water requirements vary, these will create fluctuations in the lake level. Lakes can be also Trophic state index, categorized on the basis of their richness in nutrients, which typically affect plant growth. Nutrient-poor lakes are said to be ''oligotrophic'' and are generally clear, having a low concentration of plant life. ''Mesotrophic lakes'' have good clarity and an average level of nutrients. ''Eutrophic'' lakes are enriched with nutrients, resulting in good plant growth and possible algal blooms. ''eutrophication, Hypertrophic'' lakes are bodies of water that have been excessively enriched with nutrients. These lakes typically have poor clarity and are subject to devastating algal blooms. Lakes typically reach this condition due to human activities, such as heavy use of fertilizers in the lake catchment area. Such lakes are of little use to humans and have a poor ecosystem due to decreased dissolved oxygen. Due to the unusual relationship between water's temperature and its density, lakes form layers called thermoclines, layers of drastically varying temperature relative to depth. Fresh water is most dense at about 4 degrees Celsius (39.2 °F) at sea level. When the temperature of the water at the surface of a lake reaches the same temperature as deeper water, as it does during the cooler months in temperate climates, the water in the lake can mix, bringing oxygen-starved water up from the depths and bringing oxygen down to decomposing sediments. Deep temperate lakes can maintain a reservoir of cold water year-round, which allows some cities to tap that reservoir for deep lake water cooling. Since the surface water of deep tropical lakes never reaches the temperature of maximum density, there is no process that makes the water mix. The deeper layer becomes oxygen starved and can become saturated with carbon dioxide, or other gases such as sulfur dioxide if there is even a trace of volcano, volcanic activity. Exceptional events, such as earthquakes or landslides, can cause mixing which rapidly brings the deep layers up to the surface and release a vast cloud of gas which lay trapped in solution in the colder water at the bottom of the lake. This is called a limnic eruption. An example is Lake Nyos#The 1986 disaster, the disaster at Lake Nyos in Cameroon. The amount of gas that can be dissolved in water is directly related to pressure. As deep water surfaces, the pressure drops and a vast amount of gas comes out of solution. Under these circumstances carbon dioxide is hazardous because it is heavier than air and displaces it, so it may flow down a river valley to human settlements and cause mass asphyxiation. The material at the bottom of a lake, or ''lake bed'', may be composed of a wide variety of inorganics, such as silt or sand, and organic material, such as decaying plant or animal matter. The composition of the lake bed has a significant impact on the flora and fauna found within the lake's environs by contributing to the amounts and the types of nutrients available. A paired (black and white) layer of the varved lake sediments correspond to a year. During winter, when organisms die, carbon is deposited down, resulting to a black layer. At the same year, during summer, only few organic materials are deposited, resulting to a white layer at the lake bed. These are commonly used to track past paleontological events. Natural lakes provide a Macrocosm and microcosm, microcosm of living and nonliving elements that are relatively independent of their surrounding environments. Therefore, lake organisms can often be studied in isolation from the lake's surroundings.


Limnology

Limnology is the study of inland bodies of water and related ecosystems. Limnology divides lakes into three zones: the ''littoral zone'', a sloped area close to land; the ''photic zone, photic'' or ''open-water zone'', where sunlight is abundant; and the deep-water ''profundal zone, profundal'' or ''benthic zone'', where little sunlight can reach. The depth to which light can reach in lakes depends on turbidity, determined by the density and size of suspended Particle (ecology), particles. A particle is in Suspension (chemistry), suspension if its weight is less than the random turbidity forces acting upon it. These particles can be sedimentary or Biotic material, biological in origin and are responsible for the color of the water. Decaying plant matter, for instance, may be responsible for a yellow or brown color, while algae may cause greenish water. In very shallow water bodies, iron oxides make water reddish brown. Biological particles include algae and detritus. Bottom-dwelling detritivorous fish can be responsible for turbid waters, because they stir the mud in search of food. Piscivorous fish contribute to turbidity by eating plant-eating (planktonivorous) fish, thus increasing the amount of algae (see aquatic trophic cascade). The light depth or transparency is measured by using a ''Secchi disk'', a 20-cm (8 in) disk with alternating white and black Circular sector, quadrants. The depth at which the disk is no longer visible is the ''Secchi depth'', a measure of transparency. The Secchi disk is commonly used to test for eutrophication. For a detailed look at these processes, see lentic ecosystems. A lake moderates the surrounding region's temperature and climate because water has a very high specific heat capacity (4,186 J·kg−1·K−1). In the daytime a lake can cool the land beside it with local winds, resulting in a sea breeze; in the night it can warm it with a land breeze.


Biological Properties

Lake zones: * Epilittoral: Zone above water level entirely that is never touched by water levels. * Littoral: Zone which encompasses from the small area above the normal water line that is sometimes touched by increasing water levels to the deepest part of the lake that still allows for submerged macrophytic growth. * Littoriprofundal: A transition zone that is commonly aligned with stratified lakes’ metalimnions, this zone is too deep for macrophytes but includes photosynthetic algae and bacteria. * Profundal: Sedimentary zone which does not contain any vegetation. Algal community types: * Epipelic: Algae which grows on sediments. * Epilithic: Algae which grows on top of rock. * Epipsammic: Algae growing on or within sand. * Epiphytic: Algae growing on macrophytes. * Epizooic: Algae growing on animals. * Metaphyton: Algae present in the littoral zone that is not in a state of suspension nor attached to a substratum (such as a macrophyte).


Circulation


Flora and fauna


Disappearance

dry lake, 15 February 2007. Landsat 5 satellite photo The lake may be infilled with deposited sediment and gradually become a wetland such as a swamp or marsh. Large water plants, typically Phragmites, reeds, accelerate this closing process significantly because they partially decompose to form peat soils that fill the shallows. Conversely, peat soils in a marsh can naturally burn and reverse this process to recreate a shallow lake resulting in a dynamic equilibrium between marsh and lake. This is significant since wildfire has been largely suppressed in the developed world over the past century. This has artificially converted many shallow lakes into emergent marshes. Turbid lakes and lakes with many plant-eating fish tend to disappear more slowly. A "disappearing" lake (barely noticeable on a human timescale) typically has extensive plant mats at the water's edge. These become a new habitat for other plants, like Sphagnum, peat moss when conditions are right, and animals, many of which are very rare. Gradually, the lake closes and young peat may form, forming a fen. In lowland river valleys where a river can meander, the presence of peat is explained by the infilling of historical oxbow lakes. In the final stages of Ecological succession, succession, trees can grow in, eventually turning the wetland into a forest. Some lakes can disappear seasonally. These are called intermittent lakes, ephemeral lakes, or seasonal lakes and can be found in Karst, karstic terrain. A prime example of an intermittent lake is Lake Cerknica in Slovenia or Lag Prau Pulte in Graubünden. Other intermittent lakes are only the result of above-average precipitation in a closed, or endorheic basin, usually filling dry lake beds. This can occur in some of the driest places on earth, like Death Valley. This occurred in the spring of 2005, after unusually heavy rains. The lake did not last into the summer, and was quickly evaporated (see photos to right). A more commonly filled lake of this type is Sevier Lake of west-central Utah. Sometimes a lake will disappear quickly. On 3 June 2005, in Nizhny Novgorod Oblast, Russia, a lake called Lake Beloye (Nizhny Novgorod Oblast), Lake Beloye vanished in a matter of minutes. News sources reported that government officials theorized that this strange phenomenon may have been caused by a shift in the soil underneath the lake that allowed its water to drain through channels leading to the Oka River. The presence of ground permafrost is important to the persistence of some lakes. Thawing permafrost may explain the shrinking or disappearance of hundreds of large Arctic lakes across western Siberia. The idea here is that rising air and soil temperatures thaw permafrost, allowing the lakes to drain away into the ground. Some lakes disappear because of human development factors. The shrinking Aral Sea is described as being "murdered" by the diversion for irrigation of the rivers feeding it.


Extraterrestrial lakes

Only one world other than Earth is known to harbor large lakes, Saturn's largest moon, Titan (moon), Titan. Photographs and spectroscopic analysis by the Cassini–Huygens spacecraft show liquid ethane on the surface, which is thought to be mixed with liquid methane. The largest Titanean lake, Kraken Mare at 400,000 km2, is three-times the size of any lake on Earth, and even the second, Ligeia Mare, is estimated to be slightly larger than Earth's Lake Michigan–Huron. Jupiter's large moon Io (moon), Io is volcanically active, and as a result sulfur deposits have accumulated on the surface. Some photographs taken during the Galileo spacecraft, Galileo mission appear to show lakes of liquid sulfur in volcanic caldera, though these are more analogous to lake of lava than of water on Earth. The planet Mars has only one confirmed lake; it is underground and near the south pole. However, the surface of Mars is too cold and has too little atmospheric pressure to permit permanent surface water. Geologic evidence appears to confirm, however, that ancient lakes once formed on the surface. It is also possible that volcanic activity on Mars will occasionally melt subsurface ice, creating large temporary lakes. This water would quickly freeze and then sublimate, unless insulated in some manner, such as by a coating of volcanic ash. There are dark basaltic plains on the Moon, similar to lunar mare, lunar maria but smaller, that are called ''lacus'' (singular ''lacus'', Latin for "lake") because they were thought by early astronomers to be lakes of water.


Notable lakes on Earth

File:Roundtanglelake.JPG, Round Tangle Lake, one of the Tangle Lakes, 2,864 feet (873 m) above sea level in interior Alaska * The largest lake by surface area is Caspian Sea, which is despite its name considered as a lake from the point of view of geography. Its surface area is 143,000 sq. mi./371,000 km2. * The second largest lake by surface area, and the largest freshwater lake by surface area, is Lake Michigan-Huron, which is hydrologically a single lake. Its surface area is 45,300 sq. mi./117,400 km2. For those who consider Lake Michigan-Huron to be separate lakes, and Caspian Sea to be a sea, Lake Superior would be the largest lake at 82,100 km2 (31,700 square miles) * Lake Baikal is the deepest lake in the world, located in Siberia, with a bottom at . Its mean depth is also the greatest in the world ().
It is also the world's largest freshwater lake by volume (, but much smaller than the Caspian Sea at ), and the second longest (about from tip to tip). * The world's ancient lake, oldest lake is Lake Baikal, followed by Lake Tanganyika in Tanzania. Lake Maracaibo is considered by some to be the second-oldest lake on Earth, but since it lies at sea level and nowadays is a contiguous body of water with the sea, others consider that it has turned into a small bay. * The longest lake is Lake Tanganyika, with a length of about (measured along the lake's center line).
It is also the third largest by volume, the second oldest, and the second deepest () in the world, after Lake Baikal. * The world's highest lake, if size is not a criterion, may be the crater lake of Ojos del Salado, at . * The highest large (greater than ) lake in the world is the Lake Puma Yumco, Pumoyong Tso (Pumuoyong Tso), in the Tibet Autonomous Region of China, at 28-34N 90-24E, above sea level. * The world's highest commercially navigable lake is Lake Titicaca in Peru and Bolivia at . It is also the largest lake in South America. * The world's lowest lake is the Dead Sea, bordered by Jordan to the east and Israel and State of Palestine, Palestine to the west, at below sea level. It is also one of the lakes with highest salt concentration. * Lake Michigan–Huron has the longest lake coastline in the world: about , excluding the coastline of its many inner islands. Even if it is considered two lakes, Lake Huron alone would still have the longest coastline in the world at . * The largest island in a lake is Manitoulin Island in Lake Michigan–Huron, Lake Michigan-Huron, with a surface area of . Lake Manitou, on Manitoulin Island, is the largest lake on an island in a lake. * The largest lake on an island is Nettilling Lake on Baffin Island, with an area of and a maximum length of .Largest island in a lake on an island in a lake on an island
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* The largest lake in the world that drains naturally in two directions is Wollaston Lake. * Lake Toba on the island of Sumatra is in what is probably the largest resurgent caldera on Earth. * The largest lake completely within the boundaries of a single city is Lake Wanapitei in the city of Greater Sudbury, Sudbury, Ontario, Canada. Before the current city boundaries came into effect in 2001, this status was held by Lake Ramsey, also in Sudbury. * Lake Enriquillo in Dominican Republic is the only saltwater lake in the world inhabited by crocodiles. * Lake Bernard, Ontario, Canada, claims to be the largest lake in the world with no islands. * The largest lake in one country is Lake Michigan, in the United States. However, it is sometimes considered part of Lake Michigan-Huron, making the record go to Great Bear Lake, Northwest Territories, in Canada, the largest lake within one jurisdiction. * The largest lake on an island in a lake on an island is Crater Lake on Vulcano Island in Lake Taal on the island of Luzon, The Philippines. * The northernmost named lake on Earth is Upper Dumbell Lake in the Qikiqtaaluk Region of Nunavut, Canada at a latitude of 82°28'N. It is southwest of Alert, Nunavut, Alert, the northernmost settlement in the world. There are also several small lakes north of Upper Dumbell Lake, but they are all unnamed and only appear on very detailed maps.


Largest by continent

The largest lakes (surface area) by continent are: * Australia – Lake Eyre (salt lake) * Africa – Lake Victoria, also the third-largest freshwater lake on Earth. It is one of the Great Lakes of Africa. * Antarctica – Lake Vostok (subglacial) * Asia – Lake Baikal (if the Caspian Sea is considered a lake, it is the largest in Eurasia, but is divided between the two geographic continents) * Oceania – Lake Eyre when filled; the largest permanent (and freshwater) lake in Oceania is Lake Taupo. * Europe – Lake Ladoga, followed by Lake Onega, both in northwestern Russia. * North America – Lake Michigan-Huron, which is hydrologically a single lake. However, lakes Lake Huron, Huron and Lake Michigan, Michigan are usually considered separate lakes, in which case Lake Superior would be the largest. * South America – Lake Titicaca, which is also the highest navigable body of water on Earth at above sea level. The much larger Lake Maracaibo is much older, but perceived by some to no longer be genuinely a lake for multiple reasons.


See also


Notes


References


External links


World Lake Database

Global Lake Database
{{Authority control Lakes, Bodies of water Lacustrine landforms