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Changing Antarctica viewed by NASA satellite NASA/JPL NEWS RELEASE Posted: April 14, 2002 NASA instruments flying on the Terra satellite have observed the calving of an iceberg and the breakup of an ice shelf in Antarctica, roughly 2,100 kilometers (1,300 miles) from one another.
The progression of both breakups were initially observed by NASA's Moderate Resolution Imaging Spectroradiometer. Images of the subsequent calving and ice shelf breakup were captured by NASA's Multi-angle Imaging SpectroRadiometer. The B-22 iceberg measures approximately 82 kilometers (about 32 miles) long by 62 kilometers (about 24 miles) wide. Comparison of the images shows the iceberg, located below and to the left of center, has drifted away from the ice shelf. The breakup of ice near the shelf edge, in the area surrounding B-22, is also visible in the later image. These natural-color images were acquired on March 10 and 24, 2002, respectively. Antarctic researchers have reported an increase in the frequency of iceberg calving in recent years. It has not yet been established if this is a result of regional climate variation or the global warming trend. The two views of the ice shelf breakup, acquired on March 7, 2002, provide helpful chemical and topographical perspectives. In the left-hand image, near-infrared, red and blue data from the Multi-angle Imaging SpectroRadiometer's nadir (vertical-viewing) camera causes water ice within the ice shelf to appear vibrant blue. Water has an intrinsic blue color due to the selective absorption of longer wavelengths such as red and infrared, and the translucent properties of ice within the collapsing shelf enables this absorption to be observed.
The Multi-angle Imaging SpectroRadiometer, built and managed by NASA's Jet Propulsion Laboratory, Pasadena, Calif., is one of several Earth-observing experiments aboard Terra, launched in December 1999. The instrument acquires images of Earth at nine angles simultaneously, using nine separate cameras pointed forward, downward, and backward along its flight path. The Terra mission supports NASA's Earth Science Enterprise, a long-term research effort designed to help better understand and protect our home planet. JPL is a division of the California Institute of Technology in Pasadena.
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