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  Image: Geographic Location Direction Photo #: ISS016-E-6986 Date: Oct. 2007
Geographic Region: USA-COLORADO

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  Great Sand Dunes National Park and Preserve, Colorado

The Sangre de Cristo Mountains of south-central Colorado stretch dramatically from top left to lower right of this astronaut photograph. The mountains are outlined by dark green forests at lower elevations and white, snow-capped peaks at the highest elevations. Dun-colored dunes, covering an area of 80 square kilometers, are banked up on the west side of the mountains. These dunes make up the Great Sand Dunes National Park and Preserve. Originally established in 1932 as a National Monument, it was reauthorized as a National Park in 2004. The park contains dunes over 227 meters (about 750 feet) high--among the highest in North America.

Sand grains that make up the dunes are small enough to be moved along by the wind (a process known as saltation), although much of the dune field is now anchored by vegetation. Winds blow predominately to the east, so that sand in the San Luis Valley (part of which appears at image lower left) is driven towards and piled against the Sangre de Cristo Mountains. The sand of the dunes is mostly derived from ancient exposed lakebed sediments--now the floor of the San Luis Valley--that formed by erosion of rocks in the Sangre de Cristo and San Juan Mountains (located to the west). The action of streams and occasional storms today returns some of the impounded sand back to the valley, where the prevailing winds begin the sand's migration to the dune field anew.

The dune field has settled in a low spot along the Sangre de Cristo Mountains; the location of snow cover shows the relative altitudes of the mountains. Areas to the north of the dune field (Cleveland Peak and northward), and to the south around Blanca Peak, are higher than the ridgeline next to the dune field, where almost no snow is visible. Since winds are preferentially channeled over the lower parts of any range (hundreds of meters lower here than ridgelines to north and south), sand grains are carried up to, but not over, the low point of the range.
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Images: All Available Images Low-Resolution 303k
Mission: ISS016  
Roll - Frame: E - 6986
Geographical Name: USA-COLORADO  
Center Lat x Lon: 37.8N x 105.5W
Film Exposure:   N=Normal exposure, U=Under exposed, O=Over exposed, F=out of Focus
Percentage of Cloud Cover-CLDP: 10
Camera: E4
Camera Tilt: HO   LO=Low Oblique, HO=High Oblique, NV=Near Vertical
Camera Focal Length: 800  
Nadir to Photo Center Direction: N   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: 3152  
Date: 20071026   YYYYMMDD
Time: 163001   GMT HHMMSS
Nadir Lat: 33.3N  
Latitude of suborbital point of spacecraft
Nadir Lon: 105.3W  
Longitude of suborbital point of spacecraft
Sun Azimuth: 139   Clockwise angle in degrees from north to the sun measured at the nadir point
Space Craft Altitude: 182   nautical miles
Sun Elevation: 34   Angle in degrees between the horizon and the sun, measured at the nadir point
Water Views:  
Atmosphere Views:  
Man Made Views:  
City Views:  
Photo is not associated with any sequences

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