Description: Tips for creating and manipulating planet textures for Celestia.
from that site wrote:On the other hand, a climate model predicted that if the 10-km-diameter asteroid that hit the Earth 65 million years ago extinguishing the dinosaurs and many marine lineages hit instead today, a snowball earth would result. This is because the present cold ocean is more susceptible to surface freezing than the warm Cretaceous ocean (when a snowball earth did not occur) during the decade of reduced Solar forcing due to dust thrown up by the impact.
http://www.eps.harvard.edu/people/faculty/hoffman/snowball_paper.html wrote:At the height of the last ice age, a mere 21,000 years ago, much of North America and Europe were covered by glaciers over 2 kilometers thick, causing sea level to drop by 120 meters....(and further along)...In his model, once ice formed beyond a critical latitude (around 30 degrees north or south, equivalent to half the Earth's surface area), the positive feedback became so strong that temperatures of the surface plummeted, yielding a completely frozen planet. The relatively small amount of heat escaping from the Earth's interior is sufficient to prevent the oceans from freezing to the bottom, but would still allow a kilometer thick cap of sea ice to form, thicker at the poles and thinner at the Equator.
PlutonianEmpire wrote:My 2 cents:
I think that in a snowball earth event, deserts would likely remain ice-free, due to the fact that they don't get much moisture in the first place. I could be wrong though.
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