Perito Moreno Glacier, Los Glaciares National Park, El Calafate, Santa Cruz province, Argentina
The Perito Moreno Glacier is one of only three Patagonian glaciers that are not retreating. The terminus of the Perito Moreno Glacier is 5 kilometres (3 mi) wide, with an average height of 60 m (200 ft) above the surface of the water of Lake Argentino, in Argentina. It has a total ice depth of 170 metres (558 ft). It advances at a speed of up to 2 metres ( ft) per day (around 700 metres (2,300 ft) per year), although it loses mass at approximately the same rate, meaning that aside from small variations, its terminus has not advanced or receded in the past 90 years. At its deepest part, the glacier has a depth of approximately 700 metres (2,300 ft). Periodically the glacier advances over the L-shaped "Lago Argentino" ("Argentine Lake") forming a natural dam which separates the two halves of the lake when it reaches the opposite shore. With no escape route, the water-level on the Brazo Rico side of the lake can rise by up to 30 meters above the level of the main lake. The enormous pressure produced by the height of the dammed water finally breaks the ice barrier holding it back, in a spectacular rupture event. This dam/rupture cycle is not regular and it recurs naturally at any frequency between once a year to less than once a decade. The glacier first ruptured in 1917, taking with it an ancient forest of arrayán (Luma apiculata) trees. The last rupture occurred in July 2008, and previously in 2006, 2004, 1988, 1984, 1980, 1977, 1975, 1972, 1970, 1966, 1963, 1960, 1956, 1953, 1952, 1947, 1940, 1934 and 1917. It ruptures, on average, about every four to five years. The Perito Moreno glacier, located 78 kilometres (48 mi) from El Calafate, was named after the explorer Francisco Moreno, a pioneer who studied the region in the 19th century and played a major role in defending the territory of Argentina in the conflict surrounding the international border dispute with Chile.
Size: 5130px × 3406px
Location: Perito Moreno Glacier, Los Glaciares National Park, El Calafate, Santa Cruz province, Argentina
Photo credit: © Jonathan Gordon / Alamy / Afripics
License: Licensed
Model Released: No
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