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Your search keyword '"*PHYSICAL geography"' showing total 2 results
Start Over Descriptor "*PHYSICAL geography" Region antarctica Publisher american association for the advancement of science
2 results on '"*PHYSICAL geography"'

1. Life Under the Broken Ice.

Author

Gramling, Carolyn

Subjects
*ICEBERGS, *PHYSICAL geography, *VOYAGES & travels
Abstract

The article reports that in the balmy Antarctic summer of 2002, a Rhode Island-sized chunk of the Larsen Ice Shelf collapsed, sending thousands of icebergs into the surrounding Weddell Sea. Similar deep-sea ecosystems have been found throughout the world, but this is the first example in Antarctica. The lead scientist on the expedition, glacial geologist Eugene Domack of Hamilton College in Clinton, New York, postulates that, like many deep-sea communities, the microbes derive energy from methane or sulfide in the seawater and sediments, rather than sunlight.

Published
2005

2. Eddies and the Seesaw.

Author

Chin, Gilbert

Subjects
*CLIMATE change, *GLOBAL warming, *PHYSICAL geography
Abstract

The article presents information on a series of warm episodes, each of which lasted for several thousand years and occurred in Antarctica between 90,000 and 30,000 years ago. This bipolar seesaw have been driven by changes in the strength of the deep overturning circulation in the North Atlantic Ocean, but some have questioned how completely that process can account for the fine details of Antarctic warming events. The changes in the surface salinity gradient across the Antarctic Circumpolar Current were caused by the melting of icebergs discharged from the Arctic, which allowed increased heat transport to Antarctica by ocean eddies. This mechanism produces Antarctic warming of the magnitude observed in ice core records.

Published
2005

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