Monday, November 20, 2006
New Antarctic Ice Core Yields Detailed Climatic Insights
Bremerhaven (Germany) 19 November: Analysis of a new, high-resolution ice core in Antarctica suggests that the abrupt millennial-scale climate changes of past 150,000 years were closely linked between hemispheres. The finding supports the idea that Atlantic Ocean currents connect Greenland and Antarctica in a bipolar seesaw.
In this week's Nature, Hubertus Fischer and colleagues describe a temperature reconstruction from a new Antarctic ice core that matches the resolution of earlier results from Greenland very well. Each of the 25 abrupt temperature variations indicated by Greenland ice cores has a direct counterpart in the Antarctic ice. Moreover, the size of the temperature variations in both hemispheres also corresponds directly.
The new core spans a 150,000-year period, and its success is due largely to its geographical location. The core was drilled in an area facing the South Atlantic with plenty of snowfall. This means it has more centimeters of ice per year than other East Antarctic ice cores, and can yield direct comparisons with information collected from Greenland cores.
New results dismiss the idea that the large temperature fluctuations in Greenland could have been just local events, and point to the Atlantic Ocean circulation as the mechanism for heat transport.
(ResearchSEA)
In this week's Nature, Hubertus Fischer and colleagues describe a temperature reconstruction from a new Antarctic ice core that matches the resolution of earlier results from Greenland very well. Each of the 25 abrupt temperature variations indicated by Greenland ice cores has a direct counterpart in the Antarctic ice. Moreover, the size of the temperature variations in both hemispheres also corresponds directly.
The new core spans a 150,000-year period, and its success is due largely to its geographical location. The core was drilled in an area facing the South Atlantic with plenty of snowfall. This means it has more centimeters of ice per year than other East Antarctic ice cores, and can yield direct comparisons with information collected from Greenland cores.
New results dismiss the idea that the large temperature fluctuations in Greenland could have been just local events, and point to the Atlantic Ocean circulation as the mechanism for heat transport.
(ResearchSEA)
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