File:Vostok 420ky 4curves insolation.jpg

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420,000 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 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. See Copyright. 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 206.02(b) of Compendium II: Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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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).

derivative works

Derivative works of this file:

• Milankovitch cycles