File:Vostok 420ky 4curves insolation.jpg

This graph image could be recreated using vector graphics as an SVG file. This has several advantages; see Commons:Media for cleanup for more information. If an SVG form of this image is available, please upload it and afterwards replace this template with {{vector version available|new image name}}.

This image was uploaded in the JPEG format even though it consists of non-photographic data. This information could be stored more efficiently or accurately in the PNG format or SVG format. If possible, please upload a PNG or SVG version of this image without compression artifacts, derived from a non-JPEG source (or with existing artifacts removed). After doing so, please tag the JPEG version with {{Superseded|NewImage.ext}} and remove this tag. This tag should not be applied to photographs or scans. For more information, see {{BadJPEG}}.

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

Current period (preindustrial) 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).

	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 § 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).

derivative works[edit]

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