[ExI] Gaian Bottleneck
John Clark
johnkclark at gmail.com
Tue Feb 2 00:49:27 UTC 2016
On Mon, Feb 1, 2016 at 2:11 PM, spike <spike66 at att.net> wrote:
> >
> Force in a compressible flow varies as the square of the velocity
>
>
That's true but
it's not really force that causes the problem, it's the work and work is
force over a distance.
T
he power of the wind is proportional to the cube of the wind speed not the
square.
It's true that if you double the speed each individual oxygen and nitrogen
molecule would have 4 times the energy, but you'd have 2 times as many
molecules pass through a unit area in the same amount of time and twice as
many particles each with 4 times the energy makes 8.
So a 126 mph wind would produce twice as much damage as a 100 mph wind
and a 144 mph wind 3 times as much and a 159 mph 4 times as much.
.
> > As I wrote this, it occurred to me that such a planet would be at nearly
> 100% humidity everywhere. Think about it: wind blows from the cool side,
> hits the twilight zone, starts to warm picks up moisture from any existing
> seas, density decreases as it goes sunward, air rises, circulates back
> crossing into darkness again at high altitude, drops the moisture which
> falls as rain. That twilight zone would suffer from not only constant cold
> wind from the dark side, but from a continuous hurricane-force rainstorm,
> or perhaps blizzard. Even if the atmosphere is a tenuous .01 atm, it would
> accelerate and drive that ice and rain like little bullets.
Good point, and with 100% humidity it would be hard for large animals to
keep cool during periods of high exertion.
John K Clark
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