Original file (SVG file, nominally 600 × 480 pixels, file size: 27 KB)
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| DescriptionRadiocarbon bomb spike.svg |
English: Atmospheric 14CO2 in the second half of the 20th century.
The figure shows the 14C / 12C ratio relative to the natural level in the atmospheric CO2 as a function of time in the second half of the 20th century. The plot was generated with gnuplot from data of atmospheric radiocarbon in Wellington, New Zealand 1954AD to 1993AD and at the Vermuntsee, Austria 1959AD to 1983AD. The SVG file from gnuplot has been improved manually. The data sources provide the data as D14C. For the plot the absolute percent modern value has been calculated assuming that each measurement was done in the same year as the respective sample was taken.
Deutsch: Atmosphärisches 14CO2 in der zweiten Hälfte des 20. Jahrhunderts.
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| Date | AD 2008-08-09 | |||
| Source |
Own work (Original text: Own work. Data from the following sources:)
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| Author | Hokanomono | |||
| Permission (Reusing this file) |
All rights for generating the graphics shall be released. As far as I know there is no copyright protection on measurement data in general.
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| Other versions |
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| SVG development InfoField |
This plot uses embedded text that can be easily translated using a text editor. | |||
| Source code InfoField | Gnuplot codereset
set term svg enhanced
set output "plot.svg"
set xdata time
set timefmt "%Y-%m-%d"
set xrange ["1945-1-1":"2000-1-1"]
set format x "%Y"
set xtics 5*31556926
set grid
#set title 'Atmospheric ^{14}CO_{2}'
set xlabel 'Year (AD)'
set ylabel 'pMC/ percent'
#see Stuiver Polach for conversion between D14C and pMC
lambda = 1.0 / (8267 * 365.2422 * 24 * 3600)
set arrow from "1963-10-10", 210 to "1963-10-10", 200
set label "PTBT 10-Oct-1963" at "1963-10-10", 210 offset -5,0.5
plot [][90:230] "<awk '!/*/{print \"19\" $1 \"-\" $2 \"-\" $3, mktime(sprintf(\"19%02i %02i %02i 00 00 00\", $1, $2, $3)) - mktime(\"1950 01 01 00 00 00\"), $6, $7;}' welling.195" us 1:(($3+1000)*exp(-lambda*$2)*0.1) tit 'SH: Wellington, New Zealand' w lines, "<awk 'BEGIN{FIELDWIDTHS=\"1 7 5 7 5 2 3 3 4 2 3 3 5 6 5 4 3 2 1\";} /^ HD-/{a = mktime(sprintf(\"19%02i %02i %02i 00 00 00\", $8, $7, $6)); b = mktime(sprintf(\"19%02i %02i %02i 00 00 00\", $12, $11, $10)); present=mktime(\"1950 01 01 00 00 00\"); printf \"%s %g %4g %2g\\n\", strftime(\"%Y-%m-%d\", (a+b)/2), (b-a)/2, b-present, $16, $18;}' vermunt.c14" us 1:(($4+1000)*exp(-lambda*$3)*0.1) tit 'NH: Vermunt, Austria' w lines, 100 tit 'natural level'
set output
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:32, 10 April 2015 | | 600 × 480 (27 KB) | Hokanomono | Increase line width. |
| 08:43, 9 April 2015 |  | 600 × 480 (27 KB) | Hokanomono | Change green line to purple. | |
| 20:09, 5 April 2011 |  | 600 × 480 (27 KB) | Hokanomono | Changed “Vermunt” to “Vermuntsee”. | |
| 13:30, 9 August 2008 |  | 600 × 480 (27 KB) | Hokanomono | {{Information |Description= |Source= |Date= |Author= |Permission= |other_versions= }} | |
| 22:27, 14 March 2006 |  | 600 × 480 (21 KB) | Hokanomono | This is a new version of Media:Atmospheric radiocarbon 1954-1993.svg. I have changed the title because I'm using additional data sources now. |
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 2 |
|---|---|
| Width | 600 |
| Height | 480 |
