Re: Carbon Balance Killed The Dinos?


"Aidan Karley" <doIlookDAFTenoughTOpost@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote
in message news:VA.00000d1e.1a4e1ebf@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
In article <dv449p$ro6$1@xxxxxxxxxxxxxxxxxxxx>, Alastair McDonald wrote:


The air flow at the surface [SNIP] then there is little oceanic
heat arriving at its centre!
Sorry, you've lost me here. Because the air descending from on high
is dry, it doesn't carry much heat ... which affects oceanic heat transport
how?

There isn't any oceanic transport to centre of the Australian continent.
Therefore, since there is little atmospheric heat transport and little
oceanic transport, and these are the only forms of transport, little heat
reaches the centre of the Australian continent, and that part of the edge
of the continent that was attached to the Antarctic continent.

Temperature in the centre of the Australian continent would be low then,
because of descending cold air, but that hasn't stopped Antarctica from
retaining an icecap under present conditions with the same dryness of
descending air.

The descending air is warmed adiabatically. It is the lack of latent heat
that causes the cooling.

Quick check - you are aware that the driest desert on the planet is
high on the Antarctic ice cap?

I am well aware of that fact, and that blizzards there are cause by the
wind blowing the lying snow, not that being formed by precipitation.

You're making a fairly good case that, as with present day
Antarctica,
then Cretaceous Australia would likely have been pretty cold, and also dry.
The dryness could itself actually prevent the formation of open glaciers
simply by evaporating whatever precipitation there was. This happens these
days in significant parts of Antarctica too - areas of such ice sumlimative
ablation are prime territory for meteorite hunting, because it helps to
concentrate the meteorites at the surface.

The coastal areas of paleoaustralia would have become snow covered.


Never having been in the sea near New York at ant time, nor in
the Med, I can't comment on this. Got any numbers?

80F.

The only figure I can find in the press reports is "20C" (which I
make to be 68F). I'll email the relevant researcher and see if I can get
a bit more detail. If the results had been fully published, I'd have
expected to see more
"backscatter" on the net (abstracts if not the full article in publicly
reachable places), so I suspect that it's still being written up.

AFAIK These figure were not published in peer reviewed literature at the
time of the BBC press report. In fact publication may be awaiting the
results of further investigations this summer.

However it is known that during the Cretaceous, there was coal forming
jungles in Alaska, and semi-tropical fossils have been found in northern
Greenland. Both these lands were within the Arctic circle during the
Cretaceous.

By the way, the Thatcher's children you blame it on are, in order of
significance, American, Chinese and Indian. Soon it'll be Indian, American,
Chinese, then the Americans will become (relatively) unimportant.

The SUVs, which I see, are driven by British young mums taking the children
to school. In the US, there are school buses for that. It is not that the
British people are superior to the Americans, it is that our leaders are a
better bunch that GWB and his Neocon cronies.

Perhaps you would care to list the causes that are suggested for rapid
climate change.

Ask a climate scientist. Read some of the literature.

As I expected you cannot name any. That is because the mechanism for
abrupt climate change is unknown. However, that will not prevent another
one from happening in the near future. Only that we will be unprepared
and its effects will be even more devastating.

Cheers, Alastair.



.

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