The Perito Moreno Glacier is a glacier located in the Los Glaciares National Park in south west Santa Cruz province, Argentina. It is one of the most important tourist attractions in the Argentine Patagonia.
The Perito Moreno Glacier is one of only three Patagonian glaciers that is growing. The reason remains debated by glaciologists. The terminus of the Perito Moreno Glacier is 3 mi wide, with an average height of 240 ft above the surface of the water of Lake Argentino, in Argentina. It has a total ice depth of 558 ft.
Pressures from the weight of the ice slowly pushes the glacier over the southern arm (“Brazo Rico”) of “Lago Argentino” (“Lake Argentina”) damming the section and separating it from the rest of the lake. With no outlet, the water-level on the “Brazo Rico” side of the lake can rise by as much as 30 meters above the level of the main body of Lake Argentina. Periodically, the pressure produced by the height of the dammed water breaks through the ice barrier causing a spectacular rupture, sending a massive outpouring of water from the Brazo Rico section to the main body of Lake Argentina.
As the water exits Brazo Rico, the scored shoreline is exposed, showing evidence of the height of the water build-up. This dam–ice-bridge–rupture cycle recurs naturally between once a year to less than once a decade.
Photo Credit: Mikael