Image: Epica-vostok-grip-40kyr

Description: From the en:Vostok and en:EPICA (en:Antarctica) and GRIP (en:Greenland) en:ice cores: d-D and d-o-18, last 40kyr. Horizontal axis: time before 1950 (I think). Vertical axis: d-D (or delta-O-18 * 10). By William M. Connolley. See en:Temperature record. Note that d-D or d-O-18 is a en:proxy for temperature: more negative is colder; the period from 20 to 10 kyr shows the rise in temperature at the end of the last ice age. Note the en:Dansgaard-Oeschger events visible in the GRIP core but barely, if at all, in the Antarctic cores. d-D and d-O-18 tend to be "the same" (http://www.iceandclimate.nbi.ku.dk/publications/papers/pdfs/242.pdf/) though a factor of 8 comparison would be better than 10. Updated version of en:Image:Epica-vostok-40kyr.png including GRIP, from: GRIP: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/isotopes/ngrip-d18o-50yr.txt (ss09sea timescale) EPICA: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/epica_domec/edc_dd.txt (EDC2 timescale) Vostok: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/vostok/deutnat.txt (GT4 timescale) Code: a=readfromfile('edc_dd1.txt',col=6,ign=1) b=readfromfile('vostok_deutnat1.txt',ign=1,col=4) c=readfromfile('grip.txt',ign=10,col=2) !p.multi=[0,1,2] ep=reform(a(5,*)) vo=reform(b(2,*)) gr=reform(c(1,*))*10 plot,a(4,*),ep,title='delta-o18 vs age',/xs,xr=[0,40000],ymarg=[2,5],yr=makerange([ep,vo,gr]),th=3 oplot,col=3,b(1,*),vo,th=3 oplot,col=2,c(0,*),gr,th=3 oplot,a(4,*),ep,th=3 add_key,/rig,['EPICA (Antarctic)','Vostok (Antarctic)','GRIP (Greenland)'],[!p.color,3,2],th=3,/top
Title: Epica-vostok-grip-40kyr
Credit: en:Image:Epica-vostok-grip-40kyr.png
Author: William M. Connolley
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