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File:Vostok Petit data.svg

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Original file ‎(SVG file, nominally 1,024 × 768 pixels, file size: 77 KB)
Description

La bildo estas kopiita de wikipedia:en. La originala priskribo estas: Graph of CO2 (Green graph), temperature (Blue graph), and dust concentration (Red graph) measured from the Vostok, Antarctica ice core as reported by Petit et al., 1999. Higher dust levels are believed to be caused by cold, dry periods.

The Earth's orbital eccentricity, tilt, and precession vary in a pattern over thousands of years. The IPCC notes that Milankovitch cycles drove the ice age cycles; CO2 followed temperature change "with a lag of some hundreds of years" (visible on a graph more zoomed in than this); and that as a feedback amplified temperature change. Among other factors, CO2 is more soluble in colder than in warmer waters.
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Derivative works of this file:
Lissajous small.svg
 This image was created with gnuplot.
Applications-graphics.svg This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Generated as svg. The original can be viewed here: Vostok-ice-core-petit.png. Modifications made by Autopilot.

Data sets used are:

gnuplot commands:

unset multiplot
set term svg size 1024,768
set output "vostok-data.svg"

set border 3
set xtics nomirror
set ytics nomirror
unset xlabel
unset ylabel

set grid y
set multiplot layout 3,1

set ylabel "°C"
plot [-425:0] [-10:4] \
        "deutnat.txt" \
        using (-$2/1000):4 \
        title "Temperature variation (ΔT)" \
        ls 3 \
        with lines

set ylabel "ppmv"
plot [-425:0] \
        "co2nat.txt" \
        using (-$1/1000):2 \
        title "Carbon Dioxide" \
        ls 2 \
        with lines

set xlabel "Thousands of years ago"
set ylabel "ppm"
plot [-425:0] \
        "dustnat.txt" \
        using (-$1/1000):2 \
        title "Dust concentration" \
        ls 1 \
        with lines

After executing gnuplot, the resulting SVG file was manually changed to

  • remove the negative signs for the x axis values
  • change the hyphen-minus characters in the temperature axis values to proper minus sign characters
I, the copyright holder of this work, hereby publish it under the following licenses:
w:en:Creative Commons
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You are free:
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This licensing tag was added to this file as part of the GFDL licensing update.

GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
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Original upload log[edit]

This image is a derivative work of the following images:

  • File:Vostok-ice-core-petit.png licensed with Cc-by-sa-3.0-migrated, GFDL
    • 2006-02-15T20:38:10Z Maksim 598x441 (31557 Bytes) La bildo estas kopiita de wikipedia:en. La originala priskribo estas: Graph of [[carbon dioxide|CO2]], [[temperature]], and dust concentration measured from the [[Vostok, Antarctica]] [[ice core]] as reported by Petit et al.

Uploaded with derivativeFX

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current22:25, 30 November 2013Thumbnail for version as of 22:25, 30 November 20131,024 × 768 (77 KB)SeL mediatime axis reversed
17:39, 25 September 2011Thumbnail for version as of 17:39, 25 September 20111,024 × 768 (309 KB)Hel-hamatext improved
03:07, 27 April 2011Thumbnail for version as of 03:07, 27 April 20111,024 × 768 (83 KB)AwickertDidn't realize that it was a draw-on box instead of a measuring-box. Take 3!
03:05, 27 April 2011Thumbnail for version as of 03:05, 27 April 20111,024 × 768 (83 KB)Awickert[Shoot - last time, picked original instead of new version to upload] Manually moved axes in Inkscape such that the three plots line up with one another
03:02, 27 April 2011Thumbnail for version as of 03:02, 27 April 20111,024 × 768 (75 KB)AwickertManually moved axes in Inkscape such that the three plots line up with one another
13:25, 20 June 2010Thumbnail for version as of 13:25, 20 June 20101,024 × 768 (75 KB)Autopilot{{Information |Description=La bildo estas kopiita de wikipedia:en. La originala priskribo estas: Graph of CO<sub>2</sub> (Green graph), temperature (Blue graph), and dust concentration (Red graph) measured from the [[Vostok, Antarc

Global file usage

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Metadata

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.
Short title Gnuplot
Image title Produced by GNUPLOT 4.6 patchlevel 3
Width 1024
Height 768
Retrieved from "https://en.wikipedia.org/wiki/File:Vostok_Petit_data.svg"