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  Image: Geographic Location Direction Photo #: ISS035-E-25019 Date: Apr. 2013
Geographic Region: ARGENTINA

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  Laguna Verde, Andes Mts., Argentina

This striking and detailed astronaut photograph from the International Space Station shows water of different color within subbasins of the Laguna (lake) Verde in the high Andes of northwest Argentina. The lake floor as a local low point lies at 4095 m (13,438 feet) above sea level, whereas the peak of the local volcano west of the lake (not shown) reaches over 3000 meters higher (6818 m, 22,368 feet). Laguna Verde (58 km wide, 36 km long) often appears green, giving rise to its formal name.

This image shows the turquoise tint in the central subbasin (image center), with a yellow to black tinge to water in the southern subbasin at image left (also known locally as Laguna Negro). The northernmost basin at image right appears quite black, and the large gray zone comprising much of the rest of Laguna Verde is likely a combination of shallow water, only inches deep, and sunglint reflecting off the water surface. The reason for the color differences lays in the fact the many different families of salt-loving organisms occupy hypersaline lakes such as Laguna Verde. These appear as different colors - often bright -- depending on the salinities and temperatures of each water body or subbasin.

The rest of the lake floor is dry and appears white from the build-up of thick salt deposits. Parallel lines around the southern subbasin (Laguna Negro) indicate prior shorelines of this shrinking water body - evaporation removes water but leaves ephemeral shorelines marked with white salt.
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Images: All Available Images Low-Resolution 223k
Mission: ISS035  
Roll - Frame: E - 25019
Geographical Name: ARGENTINA  
Center Lat x Lon: 27.5S x 68.7W
Film Exposure:   N=Normal exposure, U=Under exposed, O=Over exposed, F=out of Focus
Percentage of Cloud Cover-CLDP: 10
Camera: N5
Camera Tilt: 15   LO=Low Oblique, HO=High Oblique, NV=Near Vertical
Camera Focal Length: 400  
Nadir to Photo Center Direction: NW   The direction from the nadir to the center point, N=North, S=South, E=East, W=West
Stereo?:   Y=Yes there is an adjacent picture of the same area, N=No there isn't
Orbit Number:  
Date: 20130420   YYYYMMDD
Time: 151217   GMT HHMMSS
Nadir Lat: 28.4S  
Latitude of suborbital point of spacecraft
Nadir Lon: 68.2W  
Longitude of suborbital point of spacecraft
Sun Azimuth: 28   Clockwise angle in degrees from north to the sun measured at the nadir point
Space Craft Altitude: 226   nautical miles
Sun Elevation: 46   Angle in degrees between the horizon and the sun, measured at the nadir point
Land Views: BASIN  
Water Views: LAKE, SUNGLINT  
Atmosphere Views:  
Man Made Views:  
City Views:  
Photo is not associated with any sequences

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