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Re: New Paper about Selectivity of Cretaceous-Paleogene Extinctions
On Sun, Mar 14th, 2010 at 12:57 PM, Paul Heinrich <email@example.com>
> Dear Friends,
> There is a new paper that proposes an interesting and novel
> idea about the selectivity of the Cretaceous-Paleogene
> Extinctions. It is:
> Kikuchi, R., and M. Vanneste, 2010, A theoretical
> exercise in the modeling of ground-level ozone resulting
> from the K?T asteroid impact: Its possible link with the
> extinction selectivity of terrestrial vertebrates.
> Palaeogeography, Palaeoclimatology, Palaeoecology.
> vol. 288, no. 1-4, pp.14?23.
Would ground-level O3 concentrations have been just as high in mountainous
areas? It's hard to
believe that no non-avian dinosaurs lived at any decent altitude.
That's all assuming that the atomic mass of O3 was great enough for it to
towards sea level. CO2 concentrations apparently vary with altitude during
colder months, but are
relatively uniform during the warmer months.
If there was a period of rapid cooling following the K-Pg impact, then you
might expect ground-
level O3 concentrations to be significantly greater at sea level than at
altitude. Of course, that
same cooling may well have forced mountain-dwellers downwards towards the
ground level O3 concentrations at lower altitudes.
I may have just answered my own question. :-)
GIS Specialist Australian Dinosaurs
Melbourne, Australia http://home.alphalink.com.au/~dannj