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Posts tagged Glacial Lakes

Milky Blue of Argentine Glacial Lakes

49.5S 72.6W

February 27th, 2013 Category: Lakes

Argentina and Chile – January 25th, 2013

Visible in the lower left quadrant of this image are three bright blue glacial lakes in Argentine Patagonia: Argentino Lake, Lake Viedma and Lake San Martín (below to above).

A glacial lake is a lake with origins in a melted glacier. They are formed when a glacier erodes the land, and then melts, filling the hole or space that they have created. The scouring action of the glaciers pulverizes minerals in the rock over which the glacier passes. These pulverized minerals become sediment at the bottom of the lake, and some of the rock flour becomes suspended in the water column, giving the water a milky blue color.

Glacial Lakes Amongst Southern Alps of New Zealand

44.8S 169.2E

February 27th, 2013 Category: Climate Change, Lakes, Mountains

New Zealand – February 26th, 2013

Glacial lakes can be seen here, nestled amidst the peaks of New Zealand’s Southern Alps. Scientists have found that hundreds of steep mountain glaciers, which rapidly pass their ice gains down to their termini, have all fluctuated in size due to climate change over the last 35 years. Between 1976 and 2005 the volume decreased more than 10%, from 54.60 km3 to 48.74 km3. More than 92% of this loss was from 12 of the largest glaciers.

For the big glaciers, glacial lakes have begun to form at their fronts as lowering ice levels reach the level of their outlet rivers. Once a lake has formed, it eats at the glacier far faster than surface melt. At the front of the glacier, the ice cliff calves bergs into the lake. This positive feedback ensures a massive and catastrophic depletion of the glacier volume, creating an irreversible tipping-point for the glacier. It would take an ice age climate to drive the glacier back across the lake and to reverse the process (click here for more information).

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