File:Radiocarbon bomb spike.svg

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Description

English: Atmospheric ¹⁴CO₂ in the second half of the 20^th 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.

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.

Other versions

SVG development

The SVG code is valid.

This chart was created with Gnuplot.

This plot uses embedded text that can be easily translated using a text editor.

Source code

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

File history

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

	Date/Time	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.