Decent into the Icehouse Teaser Trailer

Heres a short video introducing a recent project from The Foster Lab that is shortly coming to an end.  Tune in soon to find out more and take a look at some of our recent publictions for some of the latest results:

Lunt, D.J., Farnsworth, A., Loptson, C., Foster, G.L., Markwick, P., O'Brien, C.L., Pancost, R.D., Robinson, S.A., Wrobel, N. (2015) Palaeogeographic controls on climate and proxy interpretation Climate of the Past Discussion 11, 5683-5725,  doi:10.5194/cpd-11-5683-2015

Inglis, Gordon N., Farnsworth, Alexander, Lunt, Daniel, Foster, Gavin L., Hollis, Christopher J., Pagani, Mark, Jardine, Phillip E., Pearson, Paul N., Markwick, Paul, Galsworthy, Amanda M. J., Raynham, Lauren, Taylor, Kyle. W. R. and Pancost, Richard D. (2015) Descent toward the Icehouse: Eocene sea surface cooling inferred from GDGT distributions. Paleoceanography, Early View (doi:10.1002/2014PA002723). click here for data.

 

Is this the last year below 400 ppm?

The average CO2 value for October 2015 was 398.29 ppm.  Ralph Keeling (and he should know) thinks this month (November) may be the last time that CO2 will be below 400 ppm again in his life time (or for that matter, anyone’s lifetime).  His post here discusses why he thinks this is.

CO2 compilation from ice core (in red; Bereiter et al., 2015, GRL, doi: 10.1002/2014GL061957) and boron isotopes in blue (Hoenisch et al., 2009, Science,  doi: 10.1126/science.1171477 and Martinez-Boti et al., 2015, Nature, doi:10.1038/nature14145)

CO2 compilation from ice core (in red; Bereiter et al., 2015, GRL, doi: 10.1002/2014GL061957) and boron isotopes in blue (Hoenisch et al., 2009, Science,  doi: 10.1126/science.1171477 and Martinez-Boti et al., 2015, Nature, doi:10.1038/nature14145)

400 ppm is of course only a symbolic threshold but as the guys at Mountain Beltway suggest it should give us reason to pause and contemplate what a momentous change it is in terms of the planet.  Something we do in thefosterlab is reconstruct CO2 in the geological past using the boron isotope proxy and this allows a little bit more perspective on this issue.  The image above is a plot compiling the state of the art when it comes to CO2 over the last 3 million years or so, including some data for the Pliocene (2.6 to 5.3 Million years ago that we published this year in Nature).  What is clear is that the last time CO2 was 400 ppm was around 2.5 to 3 million years ago.  The world was a different place back then – global temperatures around 3 C warmer than the pre-industrial and sea-levels were around 20 m higher (due to retreat/collapse of the West Antarctic and Greenland ice sheets).  With global temperatures likely to top 1 C above pre-industrial levels this year and CO2 now likely to stay above 400 pppm it appears we are well on the way to a Pliocene-like future.