Misplaced Pages

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34-588: The scenic lake Chatyr-Köl lies near the pass on the Kyrgyz side. The road to Naryn and then to Balykchy and Bishkek —stretching for some 400 km (250 mi)—is narrow and in winter often impassable due to heavy snowfall and frequent avalanches . On the Chinese side, the Torugart Port of Entry (吐尔尕特口岸), where travelers must clear for customs, is located about 110 km (68 mi) from

68-461: A body of water , called saline water (see also soil salinity ). It is usually measured in g/L or g/kg (grams of salt per liter/kilogram of water; the latter is dimensionless and equal to ‰). Salinity is an important factor in determining many aspects of the chemistry of natural waters and of biological processes within it, and is a thermodynamic state variable that, along with temperature and pressure , governs physical characteristics like

102-588: A complex mixture of many different elements from different sources (not all from dissolved salts) in different molecular forms. The chemical properties of some of these forms depend on temperature and pressure. Many of these forms are difficult to measure with high accuracy, and in any case complete chemical analysis is not practical when analyzing multiple samples. Different practical definitions of salinity result from different attempts to account for these problems, to different levels of precision, while still remaining reasonably easy to use. For practical reasons salinity

136-490: A few percent (%). Physical oceanographers working in the abyssal ocean , however, are often concerned with precision and intercomparability of measurements by different researchers, at different times, to almost five significant digits . A bottled seawater product known as IAPSO Standard Seawater is used by oceanographers to standardize their measurements with enough precision to meet this requirement. Measurement and definition difficulties arise because natural waters contain

170-456: A measured density. Marine waters are those of the ocean, another term for which is euhaline seas . The salinity of euhaline seas is 30 to 35 ‰. Brackish seas or waters have salinity in the range of 0.5 to 29 ‰ and metahaline seas from 36 to 40 ‰. These waters are all regarded as thalassic because their salinity is derived from the ocean and defined as homoiohaline if salinity does not vary much over time (essentially constant). The table on

204-464: A wide range of salinities is euryhaline . Salts are expensive to remove from water, and salt content is an important factor in water use, factoring into potability and suitability for irrigation . Increases in salinity have been observed in lakes and rivers in the United States, due to common road salt and other salt de-icers in runoff. The degree of salinity in oceans is a driver of

238-408: Is 24 °C (75 °F), and the minimum one in winter is −50 °C (−58 °F). Some 88-90% of the lake basin's 208–269 mm of annual precipitation falls in summer. From October to end of April the lake surface freezes, the ice becoming as much as 0.25-1.5 m thick. The water of Chatyr Kul Lake is yellowish-green with water transparency of up to 4 metres (13 ft). The mineralization of

272-866: Is an endorheic alpine lake in the Tian Shan mountains in At-Bashy District of Naryn Province , Kyrgyzstan ; it lies in the lower part of Chatyr-Köl Depression near the Torugart Pass border crossing into China . The name of the lake means “Celestial Lake” in Kyrgyz (literally "Roof Lake"). The mean annual temperature in the lake basin is −5.6 °C (21.9 °F), with mean temperature of −22 °C (−8 °F) in January, and 7.1 °C (44.8 °F) in July. The maximum temperature in summer

306-464: Is open to all nationalities but clearance requires careful arrangement of transportation. A China-Kyrgyzstan-Uzbekistan Railway going through Torugart Pass has been in the works that would connect Kashgar and the Ferghana Valley since 2012. However, the Kyrgyz section of the rail has been stalled due to financial and technical issues. In 2023 the project development received new push from

340-528: Is protected as part of the Karatal-Japyryk Nature Reserve . The whole lake has been a game reserve ( IUCN category IV ) since 1972. The game reserve was established to protect water fowl, including the bar-headed goose . The lake is a Ramsar site of globally significant biodiversity (Ramsar Site RDB Code 2KG002). Salinity Salinity ( / s ə ˈ l ɪ n ɪ t i / ) is the saltiness or amount of salt dissolved in

374-520: Is pulled in to replace the sinking water, which in turn eventually becomes cold and salty enough to sink. Salinity distribution contributes to shape the oceanic circulation. Limnologists and chemists often define salinity in terms of mass of salt per unit volume, expressed in units of mg/L or g/L. It is implied, although often not stated, that this value applies accurately only at some reference temperature because solution volume varies with temperature. Values presented in this way are typically accurate to

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408-651: Is referred to as brine . Salinity is an ecological factor of considerable importance, influencing the types of organisms that live in a body of water. As well, salinity influences the kinds of plants that will grow either in a water body, or on land fed by a water (or by a groundwater ). A plant adapted to saline conditions is called a halophyte . A halophyte which is tolerant to residual sodium carbonate salinity are called glasswort or saltwort or barilla plants. Organisms (mostly bacteria) that can live in very salty conditions are classified as extremophiles , or halophiles specifically. An organism that can withstand

442-466: Is sometimes referred to as chlorinity. Operationally, dissolved matter is defined as that which can pass through a very fine filter (historically a filter with a pore size of 0.45 μm, but later usually 0.2 μm). Salinity can be expressed in the form of a mass fraction , i.e. the mass of the dissolved material in a unit mass of solution. Seawater typically has a mass salinity of around 35 g/kg, although lower values are typical near coasts where rivers enter

476-470: Is usually related to the sum of masses of a subset of these dissolved chemical constituents (so-called solution salinity ), rather than to the unknown mass of salts that gave rise to this composition (an exception is when artificial seawater is created). For many purposes this sum can be limited to a set of eight major ions in natural waters, although for seawater at highest precision an additional seven minor ions are also included. The major ions dominate

510-570: The Han dynasty it was under the jurisdiction of a micro-state called Juandu ( 捐毒国 ). During the Tang dynasty , the region came under Tang control as part of Anxi Protectorate . Russia and China first established a port of entry at the Torugart Pass in 1881. In 1906, Russia's Sino-Russian Transport Bank financed the construction of the road from the pass to Kashgar for 20 million rubles. In 1952,

544-529: The density and heat capacity of the water. A contour line of constant salinity is called an isohaline , or sometimes isohale . Salinity in rivers, lakes, and the ocean is conceptually simple, but technically challenging to define and measure precisely. Conceptually the salinity is the quantity of dissolved salt content of the water. Salts are compounds like sodium chloride , magnesium sulfate , potassium nitrate , and sodium bicarbonate which dissolve into ions. The concentration of dissolved chloride ions

578-564: The hydrography is such that a possible cause of reduced circulation is the production of stratified oceans. In such cases, it is more difficult to subduct water through the thermohaline circulation. Not only is salinity a driver of ocean circulation, but changes in ocean circulation also affect salinity, particularly in the subpolar North Atlantic where from 1990 to 2010 increased contributions of Greenland meltwater were counteracted by increased northward transport of salty Atlantic waters. However, North Atlantic waters have become fresher since

612-413: The world's ocean circulation , where density changes due to both salinity changes and temperature changes at the surface of the ocean produce changes in buoyancy, which cause the sinking and rising of water masses. Changes in the salinity of the oceans are thought to contribute to global changes in carbon dioxide as more saline waters are less soluble to carbon dioxide. In addition, during glacial periods,

646-408: The 1980s. Titration with silver nitrate could be used to determine the concentration of halide ions (mainly chlorine and bromine ) to give a chlorinity . The chlorinity was then multiplied by a factor to account for all other constituents. The resulting 'Knudsen salinities' are expressed in units of parts per thousand (ppt or ‰ ). The use of electrical conductivity measurements to estimate

680-552: The Torugart Pass replaced the Irkeshtam Pass, which lies some 165 km (103 mi) southwest, as the primary overland link between Xinjiang and the then- Soviet Kyrgyz Republic . The pass was closed in 1969 due to the Sino-Soviet Split and reopened again in 1983. In 1995, the Torugart Port of Entry was relocated to a lower elevation (2,000m), closer to Kashgar , some 57 km (35 mi) away. The pass

714-417: The composition of seawater. They can also be determined by making direct density measurements. A sample of seawater from most locations with a chlorinity of 19.37 ppt will have a Knudsen salinity of 35.00 ppt, a PSS-78 practical salinity of about 35.0, and a TEOS-10 absolute salinity of about 35.2 g/kg. The electrical conductivity of this water at a temperature of 15 °C is 42.9 mS/cm. On

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748-491: The form of silicic acid , which usually appears as a neutral molecule in the pH range of most natural waters, may also be included for some purposes (e.g., when salinity/density relationships are being investigated). The term 'salinity' is, for oceanographers, usually associated with one of a set of specific measurement techniques. As the dominant techniques evolve, so do different descriptions of salinity. Salinities were largely measured using titration -based techniques before

782-411: The global scale, it is extremely likely that human-caused climate change has contributed to observed surface and subsurface salinity changes since the 1950s, and projections of surface salinity changes throughout the 21st century indicate that fresh ocean regions will continue to get fresher and salty regions will continue to get saltier. Salinity is serving as a tracer of different masses. Surface water

816-513: The governments of the tree countries involved. A tripartite agreement was signed on 17 September 2022 during the Shanghai Cooperation Organization summit, however the funding is yet to be secured. This Kyrgyzstan location article is a stub . You can help Misplaced Pages by expanding it . Chatyr-K%C3%B6l Chatyr-Köl ( Kyrgyz : Чатыр-Көл , Russian : Чатыр-Куль , romanized :  Chatyr-Kul' )

850-421: The inorganic composition of most (but by no means all) natural waters. Exceptions include some pit lakes and waters from some hydrothermal springs . The concentrations of dissolved gases like oxygen and nitrogen are not usually included in descriptions of salinity. However, carbon dioxide gas, which when dissolved is partially converted into carbonates and bicarbonates , is often included. Silicon in

884-412: The ionic content of seawater led to the development of the scale called the practical salinity scale 1978 (PSS-78). Salinities measured using PSS-78 do not have units. The suffix psu or PSU (denoting practical salinity unit ) is sometimes added to PSS-78 measurement values. The addition of PSU as a unit after the value is "formally incorrect and strongly discouraged". In 2010 a new standard for

918-459: The lake ranges from 0.5 to 1.0 milligrams per liter (chloride, hydrocarbonate, sodium and magnesium type of mineralization). The salinity of the lake is 2 ppt. Mineral sources in the south part of the lake have mineralization of from 5 to 7 grams (0.18 to 0.25 oz) per liter and pH = 5,8-6,0. Flow rate is 1,866 m (65,900 cu ft) in winter and 3,629 cubic metres (128,200 cu ft) during summer. 41 small streams debouches into

952-564: The lake, of those 21 originate in Torugart Range and 20 - in Atbashy Range. Negative water balance of the lake over the last decades causes the decline in the lake level. The mineral water from the sources is cold and has a strong mineral taste and flow first into the small Chatyr Kul lake that is about 1,5 meters higher than the actual Chatyr Kul. Since 1998, a section of the lake and its shore (3,200 ha land, 3,954 ha water)

986-409: The measured conductivity at 5 °C might only be in the range of 50–80 μS/cm. Direct density measurements are also used to estimate salinities, particularly in highly saline lakes . Sometimes density at a specific temperature is used as a proxy for salinity. At other times an empirical salinity/density relationship developed for a particular body of water is used to estimate the salinity of samples from

1020-422: The ocean. Rivers and lakes can have a wide range of salinities, from less than 0.01 g/kg to a few g/kg, although there are many places where higher salinities are found. The Dead Sea has a salinity of more than 200 g/kg. Precipitation typically has a TDS of 20 mg/kg or less. Whatever pore size is used in the definition, the resulting salinity value of a given sample of natural water will not vary by more than

1054-491: The order of 1%. Limnologists also use electrical conductivity , or "reference conductivity", as a proxy for salinity. This measurement may be corrected for temperature effects, and is usually expressed in units of μS/cm . A river or lake water with a salinity of around 70 mg/L will typically have a specific conductivity at 25 °C of between 80 and 130 μS/cm. The actual ratio depends on the ions present. The actual conductivity usually changes by about 2% per degree Celsius, so

Torugart Pass - Misplaced Pages Continue

1088-754: The pass itself in Ulugqat County of the Kizilsu Kirghiz Autonomous Prefecture . Distances from the pass to major cities are: 110 km (68 mi) to Ulugqat , 165 km (103 mi) to Kashgar , 170 kilometres (110 mi) to Artux and some 1,630 km (1,010 mi) to Ürümqi . The pass is also terminus of European route E125 and, under the new National Highway plans, the China National Highway 315 , but neither are signed in this area by 2020. The pass has been used since antiquity. During

1122-598: The properties of seawater called the thermodynamic equation of seawater 2010 ( TEOS-10 ) was introduced, advocating absolute salinity as a replacement for practical salinity, and conservative temperature as a replacement for potential temperature . This standard includes a new scale called the reference composition salinity scale . Absolute salinities on this scale are expressed as a mass fraction, in grams per kilogram of solution. Salinities on this scale are determined by combining electrical conductivity measurements with other information that can account for regional changes in

1156-650: The right, modified from Por (1972), follows the "Venice system" (1959). In contrast to homoiohaline environments are certain poikilohaline environments (which may also be thalassic ) in which the salinity variation is biologically significant. Poikilohaline water salinities may range anywhere from 0.5 to greater than 300 ‰. The important characteristic is that these waters tend to vary in salinity over some biologically meaningful range seasonally or on some other roughly comparable time scale. Put simply, these are bodies of water with quite variable salinity. Highly saline water, from which salts crystallize (or are about to),

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