Monday, June 17, 2019

The life of a major ice advance

This snow will eventually melt away.  In a major ice advance it won't, and then it will build up.

We are going into a major ice age cycle.  Lucky for us, the land is still depressed from the last one, so the ice won't build up.  But in 5000 years we won't be so lucky.  :)  Then we will just go underground.

ps.  and cbc is doing a major thing on the climate crisis.  Bet they won't go here.  Everything they mentioned is 5 years old.


Harold Asmis said...

Question on ice advance. If the land pops up to its full height, then this is what happens. We have an oceanic ice age. The 20 foot snows don't melt in the summer, like up in Labrador. The Arctic ocean ice becomes 20 m thick and stays all year. Then an amazing thing happens, all that white snow becomes self-reinforcing. The ice builds up. Kilometres of ice slowly move down on Toronto. We win the NBA in an underground facility.

This is a lock, and the ice would never go away except for one thing. Isostatic depression sends the land a kilometer or two down into the squishy mantle. The land becomes below sea level. The ice mass sinks and becomes warm and it all starts to melt. The warmies cry out loud as the glaciers retreat. The ice melts rapidly, sea levels rise and there is more warmie crying.

Then the land stays depressed, and slowly rebounds like we have now. This is called isostatic rebound and for many northern cities, their docks become high and dry. The bulge, where the extra mantle material went is sinking. This is happening for the Southern US. Such is life and it is the reason for 10,000 years or more between ice advances.

When it is really cold, the animals turn on their 'gigantic gene'. They are much warmer then, and live happily. When it gets warmer again, the big beavers die off because of heat stroke. Little beavers are happy.

Penny said...

Hi Harold:
that's an interesting theory/idea you're putting forth- have you any links us interested folk could read- links that would contain additional information on things like isostatic rebound.

I figured that epigenetics likely played/s a role in animal size as a response to the natural habitat- It makes sense that life would engineer itself to survive.

Harold Asmis said...

As usual, it has all come from my warped brain. I studied isostatic rebound to the nth degree, since it has a lot to do with rock stresses. I also talked to a lot of the big guys in this field. However, everything I talk about needs a few experiments and investigations, and I couldn't come up with a convincing argument if my life was on it. :)