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Epica-vostok-grip-40kyr.png (761 × 245 pixels, file size: 9 KB, MIME type: image/png)

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
Date upload on 21:51, March 9, 2005
Source en:Image:Epica-vostok-grip-40kyr.png
Author William M. Connolley
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(Reusing this file)

Note: "subject to disclaimers" below may not actually apply. This file was tagged with {{GFDL-user-en}}, and after May 2007, Template:GFDL-self (on English Wikipedia) did not require disclaimers. Please check the image description page on the English Wikipedia (or, if it has been deleted, ask an English Wikipedia administrator). See Wikipedia:GFDL standardization for details.

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Date/TimeThumbnailDimensionsUserComment
current12:10, 13 March 2012Thumbnail for version as of 12:10, 13 March 2012761 × 245 (9 KB)William M. ConnolleyCut off title, since not all the traces are D-O-18.
12:36, 10 December 2006Thumbnail for version as of 12:36, 10 December 2006769 × 273 (7 KB)Suku{{Information |Description=From the en:Vostok and en:EPICA (en:Antarctica) and GRIP (en:Greenland) en:ice cores: d-o-18, last 40kyr. Horizontal axis: time before 1950 (I think). Vertical axis: delta-O-18. By [[:en:User:William

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