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it may be grounded on a submarine shoal. Northwest of the iceberg is a combination of sea ice and grounded icebergs. This sea ice/iceberg feature has been larger in recent
Antarctic summers than it appears in this image. The coast of Antarctica not only has sea ice that comes and goes from year to year, but also longer-lasting ice shelves (thick slabs of ice attached to the coastline that partially float on the ocean surface). Among the ice shelves on the Walgreen Coast is Dotson Ice Shelf. Although most of the surface appears smooth, several long cracks appear to trace the leading edge of the shelf, hinting that the margin may calve some long, narrow icebergs in coming summers. The presence or absence of sea ice affects both ocean surface waters and ice shelves. Thanks to its light color, sea ice reflects much of the Sun’s energy back into space, keeping underlying ocean waters cool. Without a cover of sea ice, the surface waters of the ocean warm. The exposure to sunlight also makes it possible for phytoplankton to bloom. West of the line of grounded icebergs, the ice floating in the Amundsen Sea takes on a greenish color; this may be due to phytoplankton or algae. When it comes to ice shelves, a sea-ice cap on the ocean surface dampens wave energy that might otherwise trigger ice-shelf retreat.
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