Image:Sealevel.png

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Sealevel.png‎ (633 × 467 pixels, file size: 5 KB, MIME type: image/png)

Schematic of sea level rise over the last 25,000 years.

• Black line: sea level (below present) in m.
• Blue line: rate of rise (mm/y).

Created with IDL, data from IPCC TAR.

Note that this is only a schematic and should not be taken literally. See for example http://www.pol.ac.uk/psmsl/palaeoshoreline_webpage/HTML/Science.htm for a picture drawn from more realistic data including error estimates.

The IDL code is:

sealevel=[-120,-120,-90 ,-3.5,-.75,-0.3,0]
date=    [-25,-20.,-15.,-6. ,-3  ,0,0.2]

th=5

plot,date,sealevel,th=th,/xs,xtitle='Kyr before present',ystyle=8,ytitle='Sea le
vel (m)'

axis,/yax,/save,yrange=[0,10],ytitle='mm/y',col=3

n=n_elements(date)
for i=0,n-2 do begin
  d=(sealevel(i+1)-sealevel(i))/(date(i+1)-date(i))
  plots,col=3,th=3,[date(i),date(i+1)],[1,1]*d
  if (i gt 0) then plots,col=3,th=3,[1,1]*date(i),[d,dold]
  dold=d
endfor

gettwogifs,out='~/np/wmc/sealevel'

end

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. Subject to disclaimers.

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