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File:Epica-vostok-grip-140kyr.png

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Summary

Description
English: From the Vostok and EPICA (Antarctica) and NGRIP (Greenland) ice cores: d-o-18, last 140kyr.

d-O-18 is a 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 Dansgaard-Oeschger events visible in the NGRIP core but barely, if at all, in the Antarctic cores. The period around 120 kyr is the previous interglacial; before that (140 kyr) is the previous glacial.

Horizontal axis: years before present (before 1950?). Vertical axis: delta-O-18.

See en:Image:Epica-vostok-grip-ngrip-o18.png for inclusion of both GRIP and NGRIP data.

Note that the image is mislabelled/misnamed, the red graph shows NGRIP, not GRIP data (the red graph in this image corresponds to the green graph in File:Epica-vostok-grip-ngrip-o18.png).
Suomi: Viime jääkauden lämpötilaa kuvaava happi-isotooppipitoisuuskäyrä Grönlannissa: punainen ja Antarktiksella kahdesta kohtaa: musta ja sininen.
Date (original upload 26 June 2005)
Source

Updated version of en:Image:Epica-vostok-40kyr.png including GRIP. Matlab plot of the following source data:

NGRIP: North Greenland Ice Core Project Oxygen Isotope Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2004-059. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/isotopes/ngrip-d18o-50yr.txt (ss09sea timescale)

EPICA: Jouzel, J., et al. 2004. EPICA Dome C Ice Cores Deuterium Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2004-038. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/epica_domec/edc_dd.txt (EDC2 timescale)

Vostok: Petit, J.R., et al., 2001, Vostok Ice Core Data for 420,000 Years, IGBP PAGES/World Data Center

for Paleoclimatology Data Contribution Series #2001-076. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/vostok/deutnat.txt (GT4 timescale)
Author Vostok Ice Core Data (Petit, J.R., et al., 2001); North Greenland Ice Core Project members (2004); EPICA community members (2004); this image file: William M. Connolley (2005).
Other versions File:Epica-vostok-grip-ngrip-o18.png File:Epica-vostok-40kyr.png

Licensing

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attribution share alike 		This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. Subject to disclaimers.
You are free:
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  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
This licensing tag was added to this file as part of the GFDL licensing update.
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. Subject to disclaimers.

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.

Exact dates for disclaimers to apply
Anything uploaded on the English Wikipedia with Template:GFDL-self within the following dates has disclaimers applicable. Otherwise, no disclaimers are applicable.
  • 22:43, 20 February 2004 to 17:19, 25 November 2005
  • 23:00, 26 November 2005 to 23:28, 18 May 2007
  • 21:17, 19 May 2007 to 20:01, 21 May 2007
For Template:GFDL, the dates are slightly different:
  • 21:43, 20 February 2004 to 16:27, 10 May 2007
William M. Connolley at the English-language Wikipedia, the copyright holder of this work, hereby publishes it under the following license:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
w:en:Creative Commons
attribution share alike 		This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
Attribution: William M. Connolley
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
This licensing tag was added to this file as part of the GFDL licensing update.

Note: This tag should not be used. For images that were released on the English Wikipedia using either GFDL or GFDL-self with disclaimers, use {{GFDL-user-en-with-disclaimers}}. For images without disclaimers please use {{GFDL-user-en-no-disclaimers}} instead. If you are the copyright holder of files that were released on Wikipedia, please consider removing the disclaimers.


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=[0,120000.],ymarg=[2,5],yr=makerange([ep,vo,gr]),th=1
oplot,col=3,b(1,*),vo,th=1
oplot,col=2,c(0,*),gr,th=1
oplot,a(4,*),ep,th=1
add_key,/rig,['EPICA (Antarctic)','Vostok (Antarctic)','GRIP (Greenland)'],[!p.color,3,2],th=3,/top

}}

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Date/TimeDimensionsUserComment
current13:37, 5 May 20061,169 × 373 (12 KB)Hautala{{PD-user-en|William M. Connolley}} * {{fi|Viime jääkauden lämpötilaa kuvaava happi-isotooppipitoisuuskäyrä Grönlannissa: punainen ja Antarktiksella kahdesta kohtaa: musta ja sininen.}} * {{en|From the Vostok and EPICA (Antarctica) and NGRIP (Gree

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