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Severe Sandstorm in Northeas
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| Title |
Severe Sandstorm in Northeast China |
| Description |
Visibility across much of northeastern China, including downtown Beijing, was reduced to 500 meters (1,600 feet) as a severe sandstorm swept southeastward out of the Gobi Desert on Wednesday. Residents who had to go outdoors were encouraged to wear masks to protect themselves from the choking effects of the dust and grit. The true-color image above was acquired on March 10, 2004, by the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard NASA's Terra satellite. The sandstorm, in the center of this scene, is the wall of tan to light brown streamers completely obscuring the surface and blowing toward the southeast. Scientists suspect that such sandstorm originate in areas that have been deforested and over-grazed for decades, causing the region to become more arid and exposing the dry, loose soil to the elements. Image by Jesse Allen, NASA Earth Observatory, using data courtesy the MODIS Land Rapid Response Team |
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Dust and Sand Sweeps Over No
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PIA04354
Sol (our sun)
Multi-angle Imaging SpectroR
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| Title |
Dust and Sand Sweeps Over Northeast China |
| Original Caption Released with Image |
The Multi-angle Imaging SpectroRadiometer (MISR) captured these views of the dust and sand that swept over northeast China on March 10, 2004. Information on the height of the dust and an indication of the probable dust source region are provided by these images, which include a natural-color snapshot from MISR's nadir camera (left), a stereoscopically-retrieved height field (center) and a map of terrain elevation (right). The dust appears in the natural-color image as the pale brownish ripples that traverse the image from Inner Mongolia toward the southeast, over Beijing, Liaoning and Jilin Provinces. MISR's stereoscopic feature matching algorithm retrieves height above the surface where there is sufficient spatial contrast between several view angles. When the stereo matcher determines that a location is not covered by a feature above the surface, the terrain elevation data are displayed instead. The surface elevation map at right shows that the eastern portion of the image area, Liaonang and Jilin Provinces, is mostly low, flat terrain. These are the areas where the dust appears to be thickest and where the stereo height field indicates that the tops of the dust attain heights of up to about 1500 meters above the surface terrain. Clouds are situated between about 1 and 4 kilometers above the surface. The retrieved heights shown here are uncorrected for wind effects. The square-shaped area near the center of the stereo map is an artifact of the data processing. Areas where height could not be retrieved are shown in dark grey. A decrease in spring vegetation coverage in central and eastern Inner Mongolia has been suggested to be a major contributor to spring dust storms over northern China. http://www.agu.org/pubs/crossref/2004/2003JD003913.shtml The Multiangle Imaging SpectroRadiometer observes the daylit Earth continuously and every 9 days views the entire globe between 82 degrees north and 82 degrees south latitude. These data products were generated from a portion of the imagery acquired during Terra orbit 22481. The panels cover an area of 380 kilometers x 685 kilometers, and utilize data from blocks 54 to 58 within World Reference System-2 path 121. MISR was built and is managed by NASA's Jet Propulsion Laboratory, Pasadena, CA, for NASA's Office of Earth Science, Washington, DC. The Terra satellite is managed by NASA's Goddard Space Flight Center, Greenbelt, MD. JPL is a division of the California Institute of Technology. |
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