Re: DINOSAUR digest 3384

[David Marjanovic <david.marjanovic@gmx.at>]

----- Original Message -----
From: "Jorge Dichenberg" <jorgedich@yahoo.com>
Sent: Friday, November 11, 2005 4:44 PM

> Would falling microscopic
> ejecta indeed deliver single heat pulse?

According to simulations it should have been composed of pebble-sized 
fragments, not of microscopic dust. (The impact winter is thus reduced to 
soot, sulfuric acid, nitrogen dioxide and clouds from the vaporized water.)

> They themselves say that thermal radiation was "except
> where Earth surface was shielded by very thick cloud
> cover". In the scale of Earth, hundreds of thousands
> of km2 are covered by thick clouds every day.

They should have quantified "very thick"...

> They cannot explain why birds survived, which mostly
> don't shelter - including [...] numerous
> waterbirds, shorebirds etc.

I guess those (individual) shorebirds/waterbirds that happened to be in the 
water at that moment survived the heat pulse.