| ISS011 Earth Sciences and Image Analysis Photographic Highlights |
| TOP PICKS |
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| ISS011-E-7865 |
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| Retreating Aral Sea Coastlines: The arrow-shaped island in the
Aral Sea (lower-right view, taken in 1988) used to be a
35-kilometer-long visual marker, indicating the Aral Sea to
astronauts. An image from the present International Space Station
increment (top) shows how much the coastline has changed as the sea
level has dropped during the last three decades. Arrows indicate the
northern shoreline of the original island. This 2005 image shows that
the island is now part of the mainland. Deep blues and greens
indicate the water-covered areas. The exposed sea floor is
characterized by old shorelines (parallel lines surrounding the
island) and outlines of ancient deltas. An intermediate stage in the
falling sea level is documented in a view taken in 1996 (lower left),
in which the island appears larger and elongated towards the eastern
shore of the sea. Since the 1960s, sea levels have dropped drastically as rivers that maintained the level of the Aral Sea were diverted—completely in later years—for agricultural purposes, especially for growing cotton. A thriving fishing industry in the world’s then fourth-largest lake was largely eliminated as the area of the sea shrank by more than 60 percent. Salts and pesticides that accumulated from agricultural runoff were subsequently exposed on the dry parts of the sea floor. Winds now transport these pollutants into surrounding fields and towns. Although the Kazakhstan government made a concerted effort to increase river inflow into the sea starting in 2003, it will take years before sea levels begin to rise. |
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This service is provided by the International Space Station program and the JSC Astromaterials Research & Exploration Science Directorate. Recommended Citation: Image Science and Analysis Laboratory, NASA-Johnson Space Center. "The Gateway to Astronaut Photography of Earth." . |
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