Multimedia Gallery
Research on Iceberg B-15A (Image 3)
Researchers from the University of Chicago and the University of Wisconsin install weather and global positioning system (GPS) instruments on iceberg B-15A. This is the first time an iceberg has been monitored like this, and the data will allow an unprecedented understanding of how giant icebergs make their way through the waters of Antarctica and beyond.
Iceberg B-15A is a fragment of a much larger iceberg (B-15) that broke away from the Ross Ice Shelf in March 2000. Scientists believe that the enormous piece of ice broke away as part of a long-term natural cycle (every 50 to 100 years, or so) in which the shelf--roughly the size of Texas--sheds pieces, similar to human fingernails growing and breaking off.
Researchers are using GPS, weather monitoring stations and four seismometers to track several icebergs. The goal is to learn more about what causes icebergs to calve, how and why they drift, what happens when the icebergs warm, and why they are producing previously unknown tremors that are picked up on seismometers as far away as Tahiti. Plans are to track B-15A until it disintegrates.
[Iceberg Update: In 2005, prevailing currents took B-15A slowly past the Drygalski ice tongue (an iceberg located in northern McMurdo Sound). The collision broke off the tip of Drygalski in mid-April. Iceberg B-15A sailed on along the coast, leaving McMurdo Sound until it ran aground off Cape Adare in Victoria Land (a region of Antarctica lying south of New Zealand), where it broke into several smaller pieces on Oct. 27 and 28, 2005. The largest piece is still named B-15A (its surface is now approx. 1700 kilometers2), while three additional pieces were named B-15P, B-15M and B-15N. It has since moved farther up north and broken up into more pieces. These were spotted by an air force fisheries patrol on Nov. 3, 2006. On Nov. 21, several large pieces were seen just 60 kilometers off the coast of Timaru, New Zealand, with the largest measuring about 1.8 kilometers wide and 120 feet high.] (Date of Image: Jan. 29, 2001) [Image 3 of 8 related images. See Image 4.]
Credit: Photo by Josh Landis, National Science Foundation
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