GISP2D1837 crop

Autor:

Cropped and uploaded by User:HereToHelp; original uploaded by en:User:Dragons flight; made by USGS.

Credit:

This image was produced at the National Ice Core Laboratory by employees of the USGS. It was kindly provided by Eric Cravens, Assistant Curator, National Ice Core Laboratory. Cropped from en:Image:GISP2D1837.jpg and uploaded by User:HereToHelp; original uploaded by en:User:Dragons flight; made by USGS.

Krótki link:

https://plwiki.pl/b/2eaea

źródło:

Wikimedia Commons

Wymiary:

16229 x 1807 Pixel (8233498 Bytes)

Opis:

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 to learn about past climate conditions.

Licencja:

Public domain

Komentarz do licencji:

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