File:Radiocarbon bomb spike.svg
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Dimensioni di questa anteprima PNG per questo file SVG: 600 × 480 pixel. Altre risoluzioni: 300 × 240 pixel | 960 × 768 pixel | 1 280 × 1 024 pixel | 2 560 × 2 048 pixel.
File originale (file in formato SVG, dimensioni nominali 600 × 480 pixel, dimensione del file: 27 KB)
| Descrizione |
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: Isotopenverhältnis 14C zu C in der Atmosphäre in der zweiten Hälfte des 20. Jahrhunderts. |
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| Data | AD 2008-08-09 | ||
| Fonte |
Opera propria (Testo originale: Own work. Data from the following sources: )
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| Autore | Hokanomono | ||
| Licenza (Riusare questo 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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| Altre versioni |
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| SVG sviluppo | |||
| Codice sorgente | 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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| Data/Ora | Miniatura | Dimensioni | Utente | Commento | |
|---|---|---|---|---|---|
| attuale | 15:32, 10 apr 2015 | | 600 × 480 (27 KB) | wikimediacommons>Hokanomono | Increase line width. |
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