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Wednesday, November 14, 2007

Niels Bohr Institute publishes study on Global Warming

The Ice and Climate Research Group at the Niels Bohr Institute of the University of Copenhagen published a benchmark study in Science (Vol. 317, no. 5839), which investigates data from the 3.2km deep Dome C ice core taken in East Antarctica. The study provides an unprecedentedly clear view of the climate record from 800,000 years ago to the present day.

Highly correlated with the 120,000 year core taken in Dronning Maud Land in Greenland, this study will serve as a benchmark for future Climate Change research.

Conclusions


  • Early interglacial periods were characterized by less pronounced warmth than those of the past four climatic cycles. The rainbow colors represent temperature from blue (9° colder than today) to red (4.5° warmer than today).



  • The study suggests that interplay between obliquity (the tilt of the Earth's axis as shown by the red line on the graph) and precession (change in the position of the Earth's pole as shown by the black line on the graph) accounts for the variable intensity of interglacial periods in the ice core records.



  • CO2 and CH4 (greenhouse gas) over the past 650,000 years seem to lag behind Antarctic and tropical temperature changes rather than preceed them.



Read more (pdf)

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