# Forget ocean levels rising due to global warming what if

#### DaveC426913

Gold Member
...Earth stopped rotating?

Most of North America would be swamped under poleward rushing oceans.

A whimsical but cool look at an Earth stopped in its tracks...

From http://bigthink.com/ideas/21768".

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#### Pengwuino

Gold Member
Thank god for angular momentum.

#### Nik_2213

D'uh, what about the tide ??

#### DaveC426913

Gold Member
D'uh, what about the tide ??

#### Jim1138

Do we stop too, or do I need to get carbon fiber underwear for the 1600 KPH skid?

#### DaveC426913

Gold Member
Do we stop too, or do I need to get carbon fiber underwear for the 1600 KPH skid?
Heh. Well we can pretend that Earth come to a gentle stop. The oceans still rush poleward.

#### chazzone

As usual for programs like this, it was long on doom and gloom, and short on science.

The whole atmospheric model is ridiculous.

While some atmosphere might initially be drawn from the equatorial regions, the resulting heating would draw it back into the familiar convection loop.

Likewise, the idea of a dry desert mid-band completely ignores what happens when moisture laden winds from the poles crosses the land and drops its load.

While the Coriolis Effect gives us west to east winds in the Northern hemisphere, it is not the primary driver of our climate or H2O distribution, convection is, and this convection would not only continue, but intensify bringing monsoon like conditions to some areas.

I suppose when we have an ignorant populace, it is easy to produce rubbish like this, much like the ridiculous idea that a slight increase in a trace atmospheric gas like CO2 would actually have a significant impact on our climate.

#### DaveC426913

Gold Member
As usual for programs like this, it was long on doom and gloom, and short on science.
What program?

I suppose when we have an ignorant populace, it is easy to produce rubbish like this...
What rubbish?

#### chazzone

Sorry, I was referring the the "Aftermath" program, "When the Earth Stops Spinning".
That's where I originally saw this map, and it all came flooding back, like a bad dream.
Watch it here:

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#### DaveC426913

Gold Member
Sorry, I was referring the the "Aftermath" program, "When the Earth Stops Spinning".
That's where I originally saw this map, and it all came flooding back, like a bad dream.
Watch it here:
Haha no I don't need to; I'd probably want to take a shower afterwards.

No, this map is not meant to promote any science; it is just from a "Strange Maps" site. I had no idea the map itself might have any kind of sordid history...

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#### mheslep

Gold Member
Well slow stop or not, the rotational kinetic energy has go somewhere:

$$\frac{1}{2} I \omega^2$$ = 2.14×10^20 GJ

Or enough to flash to steam ~5x10^23 kg of cold water. The ocean mass is 1.39x10^ 21 kg. Time to redraw that map all brown, or red because the crust is going to melt too.

#### Andre

hmmm, any planet around that has no spin but a lot of heat?

#### Borek

Mentor
No spin and a lot of heat... to some extent Venus fits. It rotates, but very slowly, and surface temperatures are high enough to melt lead.

#### Andre

Now, isn't that interesting? :tongue:

#### chazzone

Actually, Venus rotates in reverse, and is the only planet in the solar system that does so. This is an indication of some cataclysmic event, like a large bolide strike, which would explain the conditions observed.

#### Andre

But still the 'rotational kinetic energy' has to go somewhere or?

For alternate ideas how you can stop a planet spinning, see Correia et al 2002 and part II (but they did not do the math on conversion of spinning energy).

#### Borek

Mentor
Actually, Venus rotates in reverse
I have learned long ago to not even pretend I understand women.

#### Robot B9

What if they used a tractor beam?

#### Max™

I think Baxter had a story once where humans discovered massive superconducting cables wrapped around Venus which had been used to exchange the spin of the planet to a moon it used to have which would have been flung out of the solar system, at the cost of ruining the planet.

#### JaredJames

I too saw the discovery documentary I have agree, it did lack science.

I was actually trying to find a link to it when this little gem popped up:

"If the earth stopped, all humans would go flying off" - http://community.discovery.com/eve/forums/a/tpc/f/7501919888/m/91919730201/p/1 [Broken]

The title question of that thread says it all really. Don't whether to laugh at the stupidity or cry at the lack of education.

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#### reasonmclucus

Actually, Venus rotates in reverse, and is the only planet in the solar system that does so. This is an indication of some cataclysmic event, like a large bolide strike, which would explain the conditions observed.

Right. It's proximity to the sun would mean it could have been hit by a large object coming back from the sun on a comet like trajectory. The slingshot affect of going around the sun would have meant it was traveling at an extremely high speed. If it was close enough to the sun as it went around, it might even have still been partially molten at the time of the collision.

Astronomers speculate that our moon resulted from a collision with a large object that caused what became the moon to be ejected.

collision of Venus with a molten or partially molten mass could produced an extremely high temperature at the time of the collision resulting in the mass "melting" into Venus. Such an event would have evaporated any water, including subterranean water. Water is a light weight gas when compared to other atmospheric gases and could easily escaped Venus gravity at a high temperature.

The dense cloud cover could prevent the surface from receiving any significant solar radiation by reflecting the radiation back into space.

Earth's atmosphere loses heat from updrafts which convert the potential energy of rising gases to potential energy which is not converted back to heat when the air returns to the surface as a downdraft. That process may not exist on Venus because the heavy cloud cover may prevent vertical movement of gases.

#### Studiot

Earth's atmosphere loses heat from updrafts which convert the potential energy of rising gases to potential energy which is not converted back to heat when the air returns to the surface as a downdraft. That process may not exist on Venus because the heavy cloud cover may prevent vertical movement of gases.
I'm having trouble following this statement. Perhaps you'd like to elaborate?

#### DaveC426913

Gold Member
I'm having trouble following this statement. Perhaps you'd like to elaborate?
Heated air goes up, loses heat to space.
Air falls, but does not reconvert back to heat.