Mynd:NASA image -- Walgreen Coast, West Antarctica -b.jpg
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NASA image acquired March 14, 2010 Pine Island Bay is tucked into a corner of the West Antarctic’s Walgreen Coast. The bay, which opens to the Amundsen Sea, is typically filled with sea ice at this time of year, but when the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite passed overhead on March 14, 2010, the bay was largely ice-free. Acquired at the end of the Antarctic summer, the image is illuminated by fairly low-angled sunlight, which highlights raised and textured areas, including ice-covered peninsulas and the corrugated surface of iceberg B-22A. B-22A 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. NASA image courtesy Jeff Schmaltz, MODIS Rapid Response Team at NASA GSFC. Caption by Michon Scott and Rebecca Lindsey, based on image interpretation by Ted Scambos, National Snow and Ice Data Center. Instrument: Aqua - MODIS To learn more about this image go to: earthobservatory.nasa.gov/IOTD/view.php?id=43499
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| Dagsetning | |
| Uppruni | Walgreen Coast, West Antarctica |
| Höfundarréttarhafi | NASA Goddard Space Flight Center from Greenbelt, MD, USA |
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This image was originally posted to Flickr by NASA Goddard Photo and Video at https://www.flickr.com/photos/24662369@N07/4516017121. It was reviewed on 12. febrúar 2011 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) |  |
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| Dagsetning/Tími | Smámynd | Víddir | Notandi | Athugasemd | |
|---|---|---|---|---|---|
| núverandi | 31. janúar 2020 kl. 01:12 | | 720 × 720 (183 KB) | Premeditated Chaos | Tagged en:Martin Peninsula and en:Bear peninsula |
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