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An endorheic lake (also called a sink lake or terminal lake) is a collection of water within an endorheic basin, or sink, with no evident outlet. Endorheic lakes are generally Saline water, saline as a result of being unable to get rid of Solute, solutes left in the lake by evaporation. These lakes can be used as indicators of anthropogenic change, such as irrigation or climate change, in the areas surrounding them. Lakes with subsurface drainage are considered cryptorheic.


Components of endorheic lakes

The two main ways that endorheic lakes accumulate water are through river flow into the lake (discharge) and precipitation falling into the lake. The collected water of the lake, instead of Discharge (hydrology), discharging, can only be lost due to either evapotranspiration or percolation (water sinking underground, e.g., to become groundwater in an aquifer). Because of this lack of an outlet, endorheic lakes are mostly salt water rather than fresh water. The salinity in the lake gradually builds up through years as water evaporates and leaves its solutes behind.


Similar types of lakes

Depending on water losses, precipitation, and Inflow (hydrology), inflow (e.g., a spring, a tributary, or flooding), the Hydrology, temporal result of a lake in a sink may change. The lake could be a persistent lake, an Lake#How lakes disappear, intermittent lake, a Dry lake, playa lake (temporarily covered with water), or an ephemeral lake, which completely disappears (e. g. by evaporation) before reappearing in wetter seasons. These terms (playa, ephemeral lake, etc.) are sometimes used interchangeably, but there has been activity tending towards defining meanings for each term. This change would mean less confusion over the designations of different types of endorheic lakes.


Anthropogenic effects

Many endorheic lakes exist in Arid climate, arid or Semi-arid climate, semi-arid climates. Because these climates have limited rainfall, but also a high possibility of evaporation, endorheic lakes in these regions often experience flux in their water levels. This flux can be aggravated by Anthropogenic effect, anthropogenic intrusions (e.g. global warming). In Central Asia, a large percentage of water for farming comes from surface water, like endorheic lakes, rather than precipitation. Because of the overall lack of precipitation, farming in this area can only be sustained by irrigation. Massive amounts of irrigation in agrarian Central Asia have led to the reduction in size of endorheic lakes. The Aral Sea was once the second largest endorheic lake in the world, but Human impact on the environment, anthropogenic effects such as bad irrigation practices have led to this lake's drastic decrease in size. Endorheic lakes, because of the closed nature of their systems, are sensitive to new conditions. Records of previous environmental change are preserved in Sediment, lake sediments in endorheic lakes that are being affected by climate change; these natural records can give information about past climates and conditions of the lake. Research on these lake sediments could lead to these lakes becoming archives of the effects of climate change.


List of endorheic lakes


Africa

* Afar Depression, Great Rift Valley in East Africa *Lake Chad in Central Africa


Asia

* Aral Sea, Kazakhstan, Uzbekistan * Caspian Sea, Iran, Azerbaijan, Russia, Kazakhstan, Turkmenistan * Dead Sea, Israel, Jordan, State of Palestine, Palestine * Gavkhouni, Isfahan, Iran * Hamun-e Jaz Murian, Kerman and Sistan and Baluchistan, Iran * Hamun Lake, Iran * Lake Urmia, West Azerbaijan Province, Iran * Lake Van, Turkey * Maharloo Lake, Fars Province, Iran * Namak Lake, Qom, Iran * Qarhan Playa, Qinghai, China


Australia

* Lake Eyre, South Australia


North America

* Carson Sink, Churchill County, Nevada, U.S. * Devil's Lake (Wisconsin), Devil's Lake, Wisconsin, U.S. * Lake Enriquillo, Dominican Republic * Etang Saum√Ętre, Haiti * Great Salt Lake, Utah, U.S. * Humboldt Sink, northwestern Nevada, U.S. * Quinn River Sink, northwestern Nevada, U.S. * Salton Sink, southern California, U.S.


See also

*


References

{{Reflist Endorheic basins Depressions (geology) Hydrology Geography terminology