Image:GISP2D1837.jpg

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Image in higher resolution (16650 × 2100 pixel, file size: 9.54 MB, MIME type: image/jpeg)

[edit] Description

This photograph shows a section of the GISP2 ice core from 1837-1838 meters in which annual layers are clearly visible. 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. 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.

A cropped version is available.

[edit] Copyright

This image was produced at the National Ice Core Laboratory by employees of the USGS with funding from the NSF, and consequently is in the public domain.

It was kindly provided by Eric Cravens, Assistant Curator, National Ice Core Laboratory.

This image is a work of a United States Geological Survey employee, taken or made during the course of the person's official duties. As a work of the United States Government, the image is in the public domain. For more information, see the USGS copyright policy.

This image is a current featured picture candidate. A featured picture should exemplify Wikipedia's very best work, and is therefore expected to meet several criteria. Please feel free to leave comments on Wikipedia:Featured picture candidates/Image:GISP2D1837.jpg

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(del) (cur) 01:12, 6 April 2007 . . Dragons flight (Talk | contribs) . . 16650×2100 (9,998,187 bytes) (==Description== This photograph shows a section of the GISP2 ice core from 1837-1838 meters in which annual layers are clearly visible. The appearance of layers results from differences in the size of snow crystals deposited in winter versus)