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#### 科里奥利效应简析

The Coriolis Effect Explained

Picture a circle.

Here’s its center.

Here’s point A and here’s point B.

Point A is twice the distance from the center
A点到中心点的距离
of the circle than point B.

Oh yeah. And it spins from its center.

In two seconds, both points do one full revolution.

But to go all the way around,

point A has to go this far
A点走了这么远
while point B only has to go this far.

And we all know, if something travels a greater distance

in a shorter amount of time,

it must be going faster.

So point A must be moving faster than point B.

OK. Now swap up this flat circle for the earth,

and the same thing is true.

All points closer to the centers,

say, like someone in Greenland,

will be spinning slower when compared to points

spinning further away from it,

say, like people in Brazil, closer to the equator.

So, if we look at it all flattened out,

we can picture something like this –

arrows of the equator travel faster

than arrows of the 45-degree line,

like we just observed.
45度纬线上的箭头
Now, imagine you’re a cloud

that formed here on the equator.

You’ll have the same velocity as the earth,

but then, a gust of wind sweeps you to the north,

where the earth isn’t spinning as fast.

Due to inertia, your speed remains the same.

You don’t get any faster,

but everything around you is literally traveling slower.

So you, relative to the ground,

If you’re a cloud that forms at the 45-degree line

you’ll also have the same speed

as everything around you.

But if you drift down to equator,

you’ll be moving slower

than the ground underneath you.

So you’ll fall behind.

And the same things for the southern hemisphere.

Moving towards the equator

always results in falling behind,

while moving away results in pushing ahead.

OK. Now imagine a low pressure cell.

That means all the arrow around it

will get sucked into the center.

But the air coming from the equator

will be traveling faster

so it will deflect to the right,

while the air coming from the poles

will be moving slower,

so they’ll fall behind and deflect to the left.

What this results in is a

circular air current spinning counterclockwise.

And that’s exactly what hurricanes are,

low pressure cells spinning,

because of the Coriolis Effect.

Moving this example down to the southern hemisphere,

things are reversed.

A low pressure cell will still

suck in the surrounding air,

but now the air coming from above

will be moving faster,

again deflecting to the right,

while the air coming from below is moving slower,

again, falling behind by moving to the left.

This results in a clockwise spin,

which is why storms in the southern hemisphere

spin this way.

It’s a short video that’s kind of the point.

I hope you got what you came for.

Uh, and the Coriolis Effect doesn’t really influence toilets.

They’re just really too small.

And the direction of the spin

more depends on the placements of jets inside the toilet.

But that’s it. That’s the Coriolis Effect.

If you like this shorten-to-the-point video,

get this video a like,

and if you want to see more videos like it,

why not subscribe?

I’ll be back next week with another video, so until then,

thanks for watching.

cc