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420,000 years of ice core data from Vostok, Antarctica research station.

Year Zero (1950) is at left. Source

From bottom to top:

  • Solar variation at 65°N due to en:Milankovitch cycles (connected to 18O).
  • 18O isotope of oxygen.
  • Levels of methane (CH4).
  • Relative temperature.
  • Levels of carbon dioxide (CO2).

From top to bottom:

  • Levels of carbon dioxide (CO2).
  • Relative temperature.
  • Levels of methane (CH4).
  • 18O isotope of oxygen.
  • Solar variation at 65°N due to en:Milankovitch cycles (connected to 18O).


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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

source: http://www.usgcrp.gov/usgcrp/images/Vostok.jpg

J. R. Petit, et al., “Climate and atmospheric history of the past 420,000 years from the Vostok ice core, Antarctica”, Nature 399:429-436 (1999).

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Derivative works of this file:  Vostok 420ky 4curves insolation to 2004.jpg

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Date/TimeThumbnailDimensionsUserComment
current17:58, 2 May 2010Thumbnail for version as of 17:58, 2 May 20101,600 × 1,092 (189 KB)Pieter KuiperReverted to version as of 08:27, 12 June 2005
18:58, 8 April 2010Thumbnail for version as of 18:58, 8 April 20101,600 × 1,092 (2 KB)Suarez ruibalversión en svg
08:27, 12 June 2005Thumbnail for version as of 08:27, 12 June 20051,600 × 1,092 (189 KB)Samulili420,000 years of ice core data from Vostok, Antarctica research station. Current period is at left. From bottom to top: Solar variation at 65°N due to Milankovitch cycles (connected to 18O). 18O isotope of oxygen. Levels of methane (CH4). Relative temp

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