DescriptionEpica-vostok-grip-40kyr.png |
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
|
Permission (Reusing this file) |
NOTE: "subject to disclaimers" below may not actually apply, this was tagged with {{GFDL-user-en}}, and after May 2007, en:Template:GFDL-self 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.
|
![GNU head GNU head](https://web.archive.org/web/20220215233106im_/https://upload.wikimedia.org/wikipedia/commons/thumb/2/22/Heckert_GNU_white.svg/64px-Heckert_GNU_white.svg.png) |
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.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue
|
![w:en:Creative Commons w:en:Creative Commons](https://web.archive.org/web/20220215233106im_/https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/CC_some_rights_reserved.svg/90px-CC_some_rights_reserved.svg.png)
![share alike share alike](https://web.archive.org/web/20220215233106im_/https://upload.wikimedia.org/wikipedia/commons/thumb/2/29/Cc-sa.svg/24px-Cc-sa.svg.png) |
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.http://creativecommons.org/licenses/by-sa/3.0/CC-BY-SA-3.0Creative Commons Attribution-Share Alike 3.0truetrue
|
|
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.
|
|