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| Pluvial lakes | |
|---|---|
| Name | Pluvial lakes |
| Caption | Ancient lakebed sediments |
| Location | Various continental interiors |
| Type | Paleolake |
| Basin countries | Multiple |
Pluvial lakes are former lake bodies that filled and persisted in continental basins during past intervals of increased precipitation and reduced evaporation. They are recognized as discrete paleogeographic features in regions such as western North America, the Sahara, central Asia, and Australia, and are documented by sedimentary deposits, shoreline terraces, and paleobiological assemblages. Their study links fields and institutions across paleoclimatology, geology, archaeology, and conservation, informing reconstructions tied to glacial cycles, monsoon shifts, and Holocene environmental change.
Pluvial lakes are defined by closed-basin hydrology, where inflow from rivers, runoff, or groundwater equals or exceeds evaporation and seepage, producing lacustrine deposits and shoreline features; examples include basins in the Great Basin (United States), Sahara Desert, Tibetan Plateau, Murray–Darling basin, and Lake Chad basin. Characteristic features include littoral benches, strandlines, deltaic sequences, varved sediments, and evaporite layers preserved in places such as Mono Lake, Lake Bonneville, Lake Lahontan, Lake Megachad, and Lake Eyre. Morphostratigraphic markers are often correlated with chronologies established at Greenland ice core, Vostok station, EPICA, GISP2, and NGRIP records, providing context for regional paleohydrological reconstructions.
Formation of pluvial lakes is controlled by shifts in precipitation-evaporation balance driven by orbital forcing such as changes in Earth's eccentricity, obliquity, and precession described by the work of Milutin Milanković and later synthesized by researchers at NASA Goddard Institute for Space Studies, NOAA, and universities like University of Arizona. Regional responses also reflect teleconnections with glacial extent (e.g., Laurentide Ice Sheet, Fennoscandian Ice Sheet), shifts in sea surface temperature patterns such as the El Niño–Southern Oscillation, and changes in monsoon systems tied to the Indian Monsoon and African Humid Period. Atmospheric circulation modes including the North Atlantic Oscillation, Pacific Decadal Oscillation, and Heinrich events influenced moisture delivery to basins that hosted pluvial lakes like Lake Bonneville and Lake Lahontan.
Sedimentological and geomorphological evidence includes lacustrine shales, tufa and marl deposits, shoreline terraces, deltaic foreset beds, and geochemical proxies (isotopes of oxygen and carbon) analyzed in cores from sites such as Mono Lake, Great Salt Lake, Salton Sea, and Lake Turkana. Tectonic setting and basin subsidence documented in regions like the Basin and Range Province, East African Rift, and Ebro Basin controlled accommodation space for lake development. Paleoshorelines are mapped alongside paleohydrology reconstructions by institutions such as the United States Geological Survey and universities including Stanford University and University of California, Berkeley. Geomorphologists use techniques refined by researchers at Lamont–Doherty Earth Observatory and Scripps Institution of Oceanography to interpret strandlines, wave-cut benches, and beach gravels.
Notable large systems include Lake Bonneville (ancient predecessor to the Great Salt Lake), Lake Lahontan (northern Nevada), Pleistocene Lake Texcoco (Valley of Mexico City), Lake Chad's megapseudolake phases (Sahel region), Lake Megafezzan (Libyan Sahara), Lake Victoria's fluctuations (East Africa), and Pleistocene lakes on the Tibetan Plateau and in western Australia such as Lake Frome. Regional studies appear in literature from institutions like Smithsonian Institution, Natural History Museum, London, Australian National University, and Peking University. Each region exhibits unique temporal patterns tied to glacial-interglacial cycles, with some basins recording multiple highstands and lowstands.
Pluvial lake phases created habitats that supported megafauna, migratory birds, and human populations; archaeological sites linked to lake margins include Paleolithic and Neolithic occupations near Lake Turkana, Lake Chad, Lake Victoria, and the former basins of Lake Bonneville and Lake Lahontan. Paleoecological proxies—fossil pollen from researchers at The Natural History Museum, London, diatom assemblages analyzed by teams at University of Washington, and vertebrate faunas curated by Smithsonian Institution—reveal shifts in vegetation and biodiversity. Cultural transitions, including routes of dispersal examined by scholars at University College London and University of Cambridge, are often associated with lake expansions and contractions during the African Humid Period and Late Pleistocene.
Methods include sediment coring and stratigraphic analysis by teams at British Antarctic Survey and INSTAAR, radiometric techniques such as radiocarbon dating applied by labs at University of Arizona, uranium-thorium dating of carbonates developed by groups at ETH Zurich, optically stimulated luminescence used by researchers at University of Oxford, and tephrochronology tied to eruptive events like those from Mount St. Helens, Mount Mazama, and Krakatoa. Geochemical proxies (δ18O, δ13C) are measured at facilities like Max Planck Institute for Chemistry and Lawrence Livermore National Laboratory, while remote sensing and GIS mapping are conducted using data from Landsat program, MODIS, and research centers including USGS Earth Resources Observation.
Modern remnants of pluvial lakes, such as Great Salt Lake, Aral Sea, Lake Chad, and Salton Sea, face anthropogenic pressures from irrigation schemes by agencies like the U.S. Bureau of Reclamation, water diversion projects in Central Asia linked to policies of the Soviet Union, and climate change documented by Intergovernmental Panel on Climate Change reports. Consequences include salinization, habitat loss affecting species protected under conventions like the Ramsar Convention, dust emissions posing public health issues studied by World Health Organization, and loss of archaeological contexts. Conservation and remediation efforts involve multinational collaborations among organizations such as United Nations Environment Programme, World Wildlife Fund, and national agencies coordinating basin-scale water management.