Ancient Antarctic sediment will reveal climate change historyApril 29th, 2008 - 2:30 pm ICT by admin
Washington, April 29 (ANI): Newly discovered ancient Antarctic sediment cores will give international scientists a close-up look at fluctuations that occurred in Antarcticas ice sheet and marine and terrestrial life as the climate cooled considerably between 20 and 14 million years ago.
Collected by Florida State Universitys (FSU) Antarctic Marine Geology Research Facility, the sediment cores were extracted from deep beneath the sea floor of Antarcticas western Ross Sea, the Earths largest floating ice body.
The new samples - segments of a drill core that measures more than 1,100 meters in length - offer an extraordinary stratigraphic record of sedimentary rock from the Antarctic continental margin that documents key developments in the areas Cenozoic climatic and glacial history.
By correlating that stratigraphic record with existing data and climate and ice sheet models, scientists from FSU and around the world expect to learn how local changes in the Southern Ocean region relate to regional and global climate events.
According to Sherwood W. Wise, Jr., an FSU geological science professor, Such knowledge will significantly increase our understanding of Antarcticas potential responses to future global-scale climate changes.
This is critical for low-lying regions such as Florida that could be directly affected by the future behavior of the Antarctic Ice Sheets and any resulting sea-level changes. By studying these glacial records of the past, geologists and climatologists seek to better predict the future, he added.
The research team will re-examine the latest core acquisitions to refine their descriptions of the material and take additional samples for tests to extract even more information about their history and the conditions under which the sediments were deposited.
The sediment cores recovered during this years successful ANDRILL (ANtarctic geological DRILLing) expedition have filled in a major gap in the most direct record of the ice activity yet recovered from the period of about 20 to 14 million years ago, said Wise.
The 1,139 meters of core retrieved, 98 percent intact, records the critical transition from times warmer than today to the onset of major cooling between about 14 to 13 million years ago when a semi-permanent ice sheet formed across most of Antarctica, he added. (ANI)
- Global warming curbs won't prevent steep sea rise - Mar 21, 2012
- Antarctica was once a warm "greenhouse" world - Apr 30, 2010
- Drop in CO2 triggered polar ice sheet formation - Dec 02, 2011
- Drilling project to reveal climate change in Antarctic - Jan 29, 2010
- Algae and pollen grains reveal sudden spike in Antarctica's temperature 15.7 mln yrs ago - Oct 01, 2009
- How did Antarctic succumb to ice age? - Jun 28, 2011
- Evidence from octopus hints at ice sheet collapse - May 10, 2012
- New digital map reveals more secrets about Antarctica - Dec 16, 2011
- Global warming disrupts natural patterns of glaciation - Jan 09, 2012
- Rising climate warning affecting stability of West Antarctic Ice Sheet - Mar 19, 2009
- Scientists estimate sea level rise by studying past carbon dioxide levels - May 02, 2011
- Ice age to interglacial period: Greatest climate change - Jul 24, 2012
- New study gives clues about carbon dioxide patterns at end of Ice Age - Oct 26, 2010
- Arctic subjected to intense warm climate intervals - Jun 22, 2012
- Seafloor fossils to reconstruct Earth's climates up to 250 million years ago - Nov 08, 2009
Tags: antarctic ice sheets, antarctic marine geology, climate change, climate changes, climate events, continental margin, drill core, floating ice, geological science, glacial history, global climate, international scientists, major gap, marine geology research, ocean region, sea level changes, sediment cores, sedimentary rock, stratigraphic record, western ross sea