Dust flux, Vostok ice core

Dust flux, Vostok ice core
Two dimensional phase space reconstruction of dust flux from the Vostok core over the period 186-4 ka using the time derivative method. Dust flux on the x-axis, rate of change is on the y-axis. From Gipp (2001).

Friday, June 8, 2012

Innovation in earth systems poster presentation

Presented at GAC in St. Johns early last week.

It looks like it can't be enlarged in this format. Later I'll try breaking it up into different panels and posting separately. The 3-d projection at lower right will be the hardest to present.


This is just the long 3-d image set at original size. Not sure about your best viewing options.

The main issue I note is that after trying to trace particular attractors through all of the different windows all at once, my interpretation of the number of areas of Lyapunov stability is a little different than when I looked at them sequentially. I now think that the ice-minimum attractor in the Early Quaternary is the same as that in the late Quaternary, even though the range of O-18 values represented in it has drifted over the last two million years. In earlier postings I had interpreted these as different attractors on the basis of the different values.

Secular drift in the positions of attractors in phase space speaks to slow changes in governing parameters of the climate system. On the scale of two million years, likely candidates are tectonic uplift (particularly around the North Atlantic), strengthening of the modern oceanographic circulation system after the closing of the Panamanian isthmus, drawdown of atmospheric CO2 due to enhanced erosion of uplifted highlands--at least these occur to me off the top of my head.

1 comment:

  1. Looking forward to a higher-def version.

    The 3-d presentation is actually surprisingly effective at showing the evolution of the phase space -- if you had described the idea, I would have expected it to be unreadable.

    They had you outside?! Pearls before, well, perhaps not swine, but really.... ;-)