File:Vostok 420ky 4curves insolation.jpg

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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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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:  Vostok 420ky 4curves insolation to 2004.jpg