Checked content

File:Vostok Petit data.svg

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.
Date 2010-06-20 13:24 (UTC)
Source
Author
  • derivative work: Autopilot ( talk)
Lissajous small.svg
 This vector 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 [0:425] \
        "deutnat.txt" \
        using ($2/1000):4 \
        title "Temperature variation (ΔT)" \
        ls 3 \
        with lines

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

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


I, the copyright holder of this work, hereby publish it under the following licenses:
w:en:Creative Commons
attribution share alike		 This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
  • share alike – If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.
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.

You may select the license of your choice.
The following pages on Schools Wikipedia link to this image (list may be incomplete):

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.
Image title Produced by GNUPLOT 4.2 patchlevel 5
Width 1024
Height 768

I want to learn more...

Wikipedia for Schools is one of SOS Children's many educational projects. SOS Children cares for children who have lost their parents. Our Children's Villages give these children a new home and a new family, while a high-quality education and the best of medical care ensures they will grow up with all they need to succeed in adult life. We have helped children in Africa for many years - you can help too...