Image:Epica do18 plot.png

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Epica_do18_plot.png‎ (596 × 417 pixels, file size: 11 KB, MIME type: image/png)

Plots of delta-deuterium against age and depth (from EPICA and Vostok)

Note that the Vostok core is deeper, but does not extend as far back in time. Note also that the y-axis offset between the EPICA and Vostok cores in delta-deuterium is real: Vostok is a colder site, hence has more negative delta. Differences in the apparent age of events are likely to be inaccuracies in converting ice depth to age.

Ice core refers as does proxy.

Data sources:

EPICA: http://www.ngdc.noaa.gov/paleo/icecore/antarctica/domec/domec_epica_data.html

Vostok: http://www.ngdc.noaa.gov/paleo/icecore/antarctica/vostok/vostok_data.html

Plotted using the IDL language by W. M. Connolley.

Note that despite the filename and caption, the values plotted are delta-deuterium not delta-o-18.[PLEASE correct]

Source code

a=readfromfile('edc_dd1.txt',col=6,ign=1)

b=readfromfile('vostok_deutnat1.txt',ign=1,col=4)

!p.multi=[0,1,2]

ep=reform(a(5,*))
vo=reform(b(2,*))

plot,a(4,*),ep,title='delta-D vs age',/xs,ymarg=[2,5],yr=makerange([ep,vo])
oplot,col=3,b(1,*),vo
add_key,/rig,['EPICA','Vostok'],[!p.colour,3]

plot,a(0,*)+3,ep,title='delta-D vs depth',/xs,ymarg=[5,2],xr=makerange(b(0,*)),yr=makerange([ep,vo])
oplot,col=3,b(0,*),vo
gettwogifs,out='~/np/wmc/b'

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• Ice core