File:Radiocarbon bomb spike.svg

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Original file (SVG file, nominally 600 × 480 pixels, file size: 27 KB)

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Description
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.
Date AD 2008-08-09
Source

Own work (Original text: Own work. Data from the following sources:)

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.

Public domain I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
In some countries this may not be legally possible; if so:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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Source code
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Gnuplot code

reset
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/TimeThumbnailDimensionsUserComment
current14:32, 10 April 2015Thumbnail for version as of 14:32, 10 April 2015600 × 480 (27 KB)Hokanomono (talk | contribs)Increase line width.
08:43, 9 April 2015Thumbnail for version as of 08:43, 9 April 2015600 × 480 (27 KB)Hokanomono (talk | contribs)Change green line to purple.
20:09, 5 April 2011Thumbnail for version as of 20:09, 5 April 2011600 × 480 (27 KB)Hokanomono (talk | contribs)Changed “Vermunt” to “Vermuntsee”.
13:30, 9 August 2008Thumbnail for version as of 13:30, 9 August 2008600 × 480 (27 KB)Hokanomono (talk | contribs){{Information |Description= |Source= |Date= |Author= |Permission= |other_versions= }}
22:27, 14 March 2006Thumbnail for version as of 22:27, 14 March 2006600 × 480 (21 KB)Hokanomono (talk | contribs)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.

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