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The Altiplano (also known as Andean Plateau) (Spanish for high plain), in west-central South America, where the Andes are at their widest, is the most extensive area of high plateau on Earth outside of Tibet. Lake Titicaca is its best known geographical feature.
The Altiplano is an area of inland drainage (endorheism) lying in the central Andes, occupying parts of northern Chile and Argentina, western Bolivia and southern Peru. Its height averages about 3,750 meters (12,300 feet), slightly less than that of the Tibetan Plateau. Unlike conditions in Tibet, the Altiplano is dominated by massive active volcanoes of the Central Volcanic Zone to the west, such as Ampato (6288 m), Tutupaca (5816 m), Parinacota (6348 m), Guallatiri (6071 m), Cerro Paroma (5728 m), Cerro Uturuncu (6008 m) and Licancabur (5916 m), and the Cordillera Real in the north east with Illampu (6368 m), Huayna Potosi (6088 m), Janq'u Uma (6427 m) and Illimani (6438 m). The Atacama Desert, one of the driest areas on the planet, lies to the southwest of the Altiplano; to the east lies the humid Amazon Rainforest.
At various times during the Pleistocene epoch, both the southern and northern Altiplano were covered by vast pluvial lakes. Remnants are Lake Titicaca, straddling the Peru–Bolivia border, and Poopó, a salt lake that extends south of Oruro, Bolivia. Salar de Uyuni, locally known as Salar de Tunupa, and Salar de Coipasa are two large dry salt flats formed after the Altiplano paleolakes dried out.
The term Altiplano is sometimes used to identify the altitude zone and the type of climate that prevails within it: it is colder than that of the tierra fría but not as cold as that of the tierra helada. Scientists classify the latter as commencing at an elevation of approximately 4,500 meters (or about 15,000 feet). Alternate names used in place of altiplano in this context include puna and páramos.
In extentum, the climate is cool and humid to semi-arid and even arid, with mean annual temperatures that vary from 3°C near the western mountain range to 12°C near Lake Titicaca; and total annual rainfall that ranges between less than 200 mm to the south west to more than 800 mm near and over Lake Titicaca. The diurnal cycle of temperature is very wide, with maximum temperatures in the order of 12 to 24°C and the minimum in the order of -20 to 10°C. The coldest temperatures occur in the southwestern portion of the Altiplano during the months of June and July, which correspond to the Austral winter. The seasonal cycle of rainfall is marked, with the rainy season concentrated between December and March. The rest of the year tends to be very dry, cool, windy and sunny. Snowfall may happen between April and September, especially to the north, but it is not very common (between one and five times a year).
- See also geology of Bolivia
Several mechanisms have been suggested as responsible for the formation of the Altiplano plateau; theories try to explain why the topography in the Andes incorporates this large area of low relief at high altitude (high plateau) within the orogen:
- Existence of weaknesses in the Earth's crust prior to tectonic shortening. Such weaknesses would cause the partition of tectonic deformation and uplift into the eastern and western cordillera, leaving the necessary space for the formation of the altiplano basin.
- Magmatic processes rooted in the asthenosphere might have contributed to uplift the plateau
- Climate has controlled the spatial distribution of erosion and sediment deposition, controlling the lubrication along the Nazca Plate subduction and hence influencing the transmission of tectonic forces into South America.
- Climate also determined the formation of internal drainage (endorheism) and sediment trapping within the Andes, potentially blocking tectonic deformation in the central area between the two cordilleras, and expelling deformation towards the flanks of the orogen
- Convective removal of the dense lower lithosphere beneath the Altiplano caused that region to isostatically 'float' higher
- The Use of Solar Energy for Improving the Living Conditions in Altiplano/Argentina
- Andes map
- Garcia-Castellanos, D., 2007. The role of climate during high plateau formation. Insights from numerical experiments. Earth Planet. Sci. Lett. 257, 372-390, doi:10.1016/j.epsl.2007.02.039.
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- Water resources of Chilean Altiplano
- Steinmetz, George (July 2008). "Altiplano - Where Bolivia meets the sky". National Geographic Magazine.