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English: This image is a photograph taken by an astronaut aboard the International Space Station, and it captures a striking blue colouration of the glacier. The colouring is due to the ice’s absorption of red wavelengths of light and scattering of blue wavelengths of light as it is transmitted through the ice. Certain portions of the glacier visible in the image are indeed grey. Linear grey-brown moraines are accumulations of soil and rock debris that form along the edges of a glacier as it flows downhill across the landscape (much like a bulldozer blade). Glaciers flowing down slope through adjacent feeder valleys ultimately meet, and debris entrained along their sides becomes concentrated in the central portion of the resulting single, large glacier—much as smaller streams of water join to form a single large river. Three of these medial moraines are visible in the ice mass at image centre left. Gray-brown patches of debris from adjacent mountainsides colour the surface of the easternmost lobe of the glacier (image top). Several crevasse fields are visible in the image. The crevasses, each a small canyon in the ice, form as a result of stress between slower- and faster-moving ice within the glacier. The crevasse patterns of Grey Glacier are complex, perhaps due to the three-lobed nature of its terminus, or end, into Grey Lake. The rugged surface of the glacier is also demonstrated by the jagged shadows it casts onto the surface of the lake. Grey Glacier, like others in southern Patagonia, loses ice from its terminus as it enters the water, a process known as calving. Calving produces large free-floating chunks of ice; some floating ice is visible near the central glacier lobe.


International Space Station InsigniaISS Crew Earth Observations: ISS015-E-10704International Space Station emblem
Identification
Mission ISS015 (Expedition 15)
Roll E
Frame 10704
Country or Geographic Name Chile
Features GREY GLACIER, GREY LAKE
Center Point Latitude -50.9° N
Center Point Longitude -73.2° E
Camera
Camera Tilt 38°
Camera Focal Length 800 mm
Camera Kodak DCS760C Electronic Still Camera
Film 3060 x 2036 pixel CCD, RGBG array.
Quality
Percentage of Cloud Cover 0-10%
Nadir What is Nadir?
Date 2007-06-04
Time 17:57:44
Nadir Point Latitude -51.1° N
Nadir Point Longitude -70.9° E
Nadir to Photo Center Direction West
Sun Azimuth 342°
Spacecraft Altitude 181 nautical miles (335 km)
Sun Elevation Angle 15°
Orbit Number 880
Original image caption
The Southern Patagonian Icefield of Chile and Argentina hosts several spectacular glaciers—including Grey Glacier located in the Torres del Paine National Park in Chile. This glacier, which in 1996 had a measured total area of 270 square kilometers and a length of 28 kilometers (104 square miles in area, 17 miles long), begins in the Patagonian Andes Mountains to the west and terminates in three distinct lobes into Grey Lake. The image is a photograph taken by an astronaut aboard the International Space Station, and it captures a striking blue coloration of the glacier. The coloring is due to the ice’s absorption of red wavelengths of light and scattering of blue wavelengths of light as it is transmitted through the ice.

Certain portions of the glacier visible in the image are indeed gray. Linear gray-brown moraines are accumulations of soil and rock debris that form along the edges of a glacier as it flows downhill across the landscape (much like a bulldozer blade). Glaciers flowing downslope through adjacent feeder valleys ultimately meet, and debris entrained along their sides becomes concentrated in the central portion of the resulting single, large glacier—much as smaller streams of water join to form a single large river. Three of these medial moraines are visible in the ice mass at image center left.

Gray-brown patches of debris from adjacent mountainsides color the surface of the easternmost lobe of the glacier (image top). Several crevasse fields are visible in the image. The crevasses, each a small canyon in the ice, form as a result of stress between slower- and faster-moving ice within the glacier. The crevasse patterns of Grey Glacier are complex, perhaps due to the three-lobed nature of its terminus, or end, into Grey Lake. The rugged surface of the glacier is also demonstrated by the jagged shadows it casts onto the surface of the lake.

All three lobes of Grey Glacier have retreated over the past 22 years, with the greatest loss of ice occurring along the westernmost lobe terminus. Grey Glacier, like others in southern Patagonia, loses ice from its terminus as it enters the water, a process known as calving. Calving produces large free-floating chunks of ice; some floating ice is visible near the central glacier lobe in the upper image. The observed retreat means that ice loss has been greater than ice replenishment. It is most likely due to a combination of increased regional temperatures and changes in precipitation amounts.

Rana
Masomi NASA Earth Observatory
Marubucin Image provided by the ISS Crew Earth Observations experiment and the Image Science & Analysis Laboratory, Johnson Space Center.

Image acquired with a Kodak 760C digital camera using an 800 mm lens.

Lasisi

Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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depicts Turanci

25 Yuni 2007

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Kodak DCS 760 Turanci

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na yanzu16:07, 5 ga Yuli, 2009Wadar sufa ta zubin 16:07, 5 ga Yuli, 20091,000 × 750 (398 KB)Originalwana{{Information |Description={{en|1=This image is a photograph taken by an astronaut aboard the International Space Station, and it captures a striking blue colouration of the glacier. The colouring is due to the ice’s absorption of red wavelengths of lig

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