ISS013-E-6947 Click the photo number to access all resolutions available and the database record.
The terminus of the Viedma Glacier, approximately 2 kilometers across where it enters Lake Viedma, is shown in this astronaut photograph. Moraines are accumulations of soil and rock debris that form along the sides and front of a glacier as it flows across the landscape (much like a bulldozer). Independent valley glaciers can merge together as they flow down slope, and the moraines become entrained in the center of the new ice mass. These medial moraines are visible as dark parallel lines within the white central mass of the glacier (image center and left). Crevasses—oriented at right angles to the medial moraines—are also visible in the grey-brown ice along the sides of the glacier. The canyon-like crevasses form as a result of stress between the slower moving ice along the valley sides (where there is greater friction) and the more rapidly moving ice in the center of the glacier. Calving of ice from the southwestern fork of the glacier terminus is visible at image lower left.
As they respond to regional climate change, the Patagonian glaciers are closely monitored using remotely sensed data. Scientists compare series of images collected over time to monitor the change in ice extent and position. Scientists have also estimated changes in volume using topographic data from NASA’s Shuttle Radar Topography Mission. The Global Land Ice Measurements from Space (GLIMS) Website is an excellent resource for glacier-monitoring information.
