Angular speed of the Earth's atmosphere

In summary: The rotation of the Earth's atmosphere has been determined by the use of satellites." They found that the atmosphere was rotating faster than the Earth, which means that the drag on the atmosphere wasn't exactly matching the drag on the Earth's surface.
  • #1
GRB 080319B
108
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Does the Earth's atmosphere match the angular speed of the Earth (i.e. is it stationary with respect to the Earth's surface, or is it "sliding" over the Earth's surface)? I'm trying to understand if the Coriolis effect that is creating the spiral pattern present in hurricane would be the same pattern if the hurricane was somehow "fixed" to the Earth's surface (if perhaps the water droplets could be represented by bowling balls rolling on the ground in the pattern of a low pressure system).

Is the Corliolis effect stronger for planets with greater angular speed?
 
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  • #2
GRB 080319B said:
Does the Earth's atmosphere match the angular speed of the Earth (i.e. is it stationary with respect to the Earth's surface, or is it "sliding" over the Earth's surface)? I'm trying to understand if the Coriolis effect that is creating the spiral pattern present in hurricane would be the same pattern if the hurricane was somehow "fixed" to the Earth's surface (if perhaps the water droplets could be represented by bowling balls rolling on the ground in the pattern of a low pressure system).

Is the Corliolis effect stronger for planets with greater angular speed?

CE apparently works for stationary polar ice caps. Replace your bowling balls with dust and ices.

http://www.physorg.com/news195924542.html

Great Red Spot, Batman
 
  • #3
Thank you for guiding me to that article. The wind at the martian ice cap is being steered/twisted by the CE as it collects and subsequently deposits ice crystals into the spiral pattern.

I was also wondering if the Earth's atmosphere matches the angular speed of the Earth? Or does the Earth "slide" underneath the atmosphere, the movement of which is driven primarily by temperature and pressure gradients and independent of interaction with Earth's surface?
 
  • #4
How could you even imagine that the atmoshere is spinning 'round as though attached to the surface?? Influenced, yes .. by gravity and friction and certainly other forces (solar convection, etc) .. Were it 'attached' there's be no winds!
 
  • #5
Were the atmosphere not spinning with the Earth we would experience (at the equator) winds on the order of 1000mph. So while the atmosphere may not be attached, it does spin with the same angual velocity as the earth.
 
  • #6
I would have guessed the angular velocity of the atmosphere was a function of the distance from the surface with distortions around mountains.
 
  • #7
tkjtkj said:
How could you even imagine that the atmoshere is spinning 'round as though attached to the surface?? Influenced, yes .. by gravity and friction and certainly other forces (solar convection, etc) .. Were it 'attached' there's be no winds!

From what I understand, the atmospheric circulation is caused by differential heating of the Earth's surface, which subsequently causes a pressure gradient in the atmosphere, and the Coriolis effect, which acts to deflect air currents moving through the pressure gradient. I don't understand why convection currents couldn't occur and drive weather patterns while the atmosphere as a whole is stationary wrt the Earth's surface?

From http://en.wikipedia.org/wiki/Wind#Cause": "Wind is caused by differences in pressure. When a difference in pressure exists, the air is accelerated from higher to lower pressure. On a rotating planet the air will be deflected by the Coriolis effect, except exactly on the equator. Globally, the two major driving factors of large scale winds (the atmospheric circulation) are the differential heating between the equator and the poles (difference in absorption of solar energy leading to buoyancy forces) and the rotation of the planet. Outside the tropics and aloft from frictional effects of the surface, the large-scale winds tend to approach geostrophic balance. Near the Earth's surface, friction causes the wind to be slower than it would be otherwise. Surface friction also causes winds to blow more inward into low pressure areas."

Integral said:
Were the atmosphere not spinning with the Earth we would experience (at the equator) winds on the order of 1000mph. So while the atmosphere may not be attached, it does spin with the same angual velocity as the earth.

Why does the Earth's atmosphere spin with the same angular speed as its surface? Purely a transference of friction from its surface?
 
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  • #8
Within naive models, the entire atmosphere has the same rotational velocity - there is no drag at the top of the atmosphere and the whole block of air behaves somewhat like a rigid body attached to the earth. The question of how true this is was important back as early as the 1960s, when satellites were starting to go up, and it was important to correct for drag at the upper atmosphere. Measurements from a number of these early satellites showed that the upper atmosphere was, in fact, rotating faster than the Earth!

See, for instance, D. G. King-Hele, Planetary and Space Science, Volume 12, Issue 9, September 1964, Pages 835-853

linkinghub.elsevier.com/retrieve/pii/0032063364900443[/URL]
 
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1. What is the angular speed of the Earth's atmosphere?

The angular speed of the Earth's atmosphere is approximately 1670 kilometers per hour at the equator. This means that at the equator, the Earth's atmosphere rotates at a rate of 1670 kilometers per hour.

2. How does the angular speed of the Earth's atmosphere affect weather patterns?

The angular speed of the Earth's atmosphere plays a crucial role in determining weather patterns. The rotation of the Earth's atmosphere causes air to move in different directions, creating high and low pressure systems that ultimately influence weather patterns.

3. Is the angular speed of the Earth's atmosphere constant?

No, the angular speed of the Earth's atmosphere is not constant. It varies with latitude, with the highest speed at the equator and decreasing towards the poles. This is due to the Earth's shape and rotation.

4. How does the angular speed of the Earth's atmosphere impact flight times?

The angular speed of the Earth's atmosphere can impact flight times, particularly for flights that travel in the same direction as the Earth's rotation. This is because the atmosphere is moving with the Earth's rotation, making it easier for planes to travel in that direction and reducing flight time. However, flights traveling against the Earth's rotation may face stronger headwinds, increasing flight time.

5. Can the angular speed of the Earth's atmosphere be changed?

No, the angular speed of the Earth's atmosphere is determined by the Earth's rotation and its shape. It cannot be changed by any external factors. However, it can be affected by factors such as climate change and changes in the Earth's rotation speed over long periods of time.

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