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			Photo #: NM23-718-501 Date: Mar. 1997 Geographic Region: ARGENTINA Feature: ANDES MOUNTAINS, GLACIERS



	NM23-718-501 Lake Viedma, Darwin Range Glaciers, Argentina Winter/Spring 1997 Although clouds cover most of the upper image (west), a small part of the Darwin Range ice field can be seen near the center; meltwater from the glacier enters the grayish-blue waters of Lake Viedma (lower right). The lake color is a result of the water containing rock flour - finely ground rock particles that are carried into glacial lakes by meltwater and remain in suspension. The ice fields of the southern Andes are remnants of a much larger glacier that covered the area 15,000 years ago. Melting of that large glacier started 13,000 years ago. During a glacial advance erosion caused by entrained boulder under the ice as well as the weight of the glacier creates basins. As glaciers in Argentina retreated, these large basin or troughs filled with meltwater to form the lakes that currently dot the area. The smaller present-day glaciers or ice fields are fed by the cool, moist westerly winds off the Pacific Ocean. The melting glaciers feed the lakes with fresh water. The outlet of Lake Viedma flows into Lake Argentino to the south. Lake Argentino is the source for Santa Cruz River, which flows eastward across Patagonia and into the Atlantic Ocean.

Images:	All Available Images Low-Resolution 346k
Mission:	NM23
Roll - Frame:	718 - 501
Geographical Name:	ARGENTINA
Features:	ANDES MOUNTAINS, GLACIERS
Center Lat x Lon:	50S x 73W
Film Exposure:	N	N=Normal exposure, U=Under exposed, O=Over exposed, F=out of Focus
Percentage of Cloud Cover-CLDP:	70
Camera:	HB
Camera Tilt:	LO	LO=Low Oblique, HO=High Oblique, NV=Near Vertical
Camera Focal Length:	250
Nadir to Photo Center Direction:	SE	The direction from the nadir to the center point, N=North, S=South, E=East, W=West
Stereo?:	Y	Y=Yes there is an adjacent picture of the same area, N=No there isn't
Orbit Number:
Date:	19970325	YYYYMMDD
Time:		GMT HHMMSS
Nadir Lat:	N	Latitude of suborbital point of spacecraft
Nadir Lon:	E	Longitude of suborbital point of spacecraft
Sun Azimuth:		Clockwise angle in degrees from north to the sun measured at the nadir point
Space Craft Altitude:		nautical miles
Sun Elevation:		Angle in degrees between the horizon and the sun, measured at the nadir point
Land Views:	MOUNTAIN, GLACIER
Water Views:	LAKE
Atmosphere Views:
Man Made Views:
City Views:

Photo is not associated with any sequences

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