File:GISP2 Ice Core.jpg
From Global Warming Art
This photograph shows a 1 meter section of the GISP2 ice core from a depth of 1837 meters in the Greenland Ice Sheet. Annual layers are clearly visible in this image. The appearance of layers results from differences in the size of snow crystals deposited in winter versus summer and resulting variations in the abundance and size of air bubbles trapped in the ice. Counting such layers has been used (in combination with other techniques) to reliably determine the age of the ice (Meese et al. 1997). This ice was formed ~16250 years ago during the final stages of the last ice age and approximately 38 years are represented here. By analyzing the ice and the gases trapped within, scientists are able learn about past climate conditions.
It was kindly provided by Eric Cravens, Assistant Curator, National Ice Core Laboratory.
- [abstract] [ Meese, D. A., A. J. Gow, R. B. Alley, G. A. Zielinski, P. M. Grootes, M. Ram, K. C. Taylor, P. A. Mayewski, and J. F. Bolzan (1997). "The Greenland Ice Sheet Project 2 depth-age scale: Methods and results". J. Geophys. Res. 102 (C12): 26,411–26,424.
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|current||02:14, 6 April 2007||16,650×2,100 (9.54 MB)||Robert A. Rohde|