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Wind changes earth rotation rate?

Wind changes earth rotation rate? - Physics Forum

Wind changes earth rotation rate? - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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  #1  
Old 12-02-2008, 05:30 PM
Stephan Wehner
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Default Wind changes earth rotation rate?



In an article "Meet the world's director of time" at

[Only registered users see links. ]

BBC News Magazine writes

"That would be fine if the earth kept good time, but in fact it
doesn't. The earth's rotation rate changes every day by thousands of
nanoseconds, and this is due in a large part to wind.

When winds push against mountain ranges, they can either speed up or
slow down the rate of spin of the solid ground, transferring that spin
into the atmosphere."

I find this hard to believe. Here some naive thoughts:

* Water pushing against beaches would carry a lot more energy.
* Most wind is caught in leaves which are not going to pass on the
energy.
* Wind is part of a circulation, so you need to take the whole cycle
into account. "Can't make a boat move by sitting in it and blowing the
sails."

I don't know that much about physics. Does anyone know a reference?
What do you say?

Stephan
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  #2  
Old 12-02-2008, 05:53 PM
dlzc
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Default Wind changes earth rotation rate?

Dear Stephan Wehner:

On Dec 2, 10:30*am, Stephan Wehner <[Only registered users see links. ]> wrote:

Baloney. The wind generally blows west to east, which would
accelerate the Earth. Tides retard the Earth's rotation.


"What about conservation of angular momentum"?


Good. Skepticism about presentations for public consumption is a wise
idea.


And is even in the right direction!


They do, through the branches, to the trunk, finally to the roots.


*Brains* separate *your* ears.


More than this news source.


[Only registered users see links. ]


You have mine.

David A. Smith
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  #3  
Old 12-02-2008, 06:10 PM
Greg Neill
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Default Wind changes earth rotation rate?

dlzc wrote:

Depends upon where you are. There are Westerlies, Easterlies,
NE Trades, and SE Trades. Also the convection cells driven by
temperature differences between the equatorial regions and
the poles and which are bent by coriolis forces.

Daily and seasonal shifts in wind patterns (like the jet stream)
move rotational inertia and angular momentum around.


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  #4  
Old 12-02-2008, 09:21 PM
Androcles
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Default Wind changes earth rotation rate?


"Stephan Wehner" <[Only registered users see links. ]> wrote in message
news:[Only registered users see links. ]...

Good. The clueless dork that wrote that has never heard of Newton's third
law.


Here some naive thoughts:

I'd say "Can't make a boat move by sitting in it and blowing the
sails", the same as you. So would Newton.
The reference is
[Only registered users see links. ]
but Newton wrote it in Latin which may not help.

An English translation would be "for every action there is an equal and
opposite reaction."


A variation in time as measured by the position of the Earth relative to
the vast majority of "fixed" stars will occur whenever the Earth's orbit is
perturbed, as it always will be by the changing position of the other
planets. That GPS guff can only be nonsense, GPS receivers do not
carry atomic clocks and these days every taxi or lorry driver has a
Tom Tom or Garmin - or is getting one as a Xmas prezzy from his
dearly beloved, they are getting really inexpensive.




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  #5  
Old 12-03-2008, 12:08 AM
OG
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Default Wind changes earth rotation rate?


"Greg Neill" <[Only registered users see links. ]> wrote in message
news:49353fe4$0$5537$[Only registered users see links. ] ...

Also wind patterns can work to move water between pole and equator and vv
which I would expect to have a mesurable effect on the Earth's angular
speed, particularly if measured on a timescale of days/weeks rather than
years.


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  #6  
Old 03-31-2012, 11:10 AM
Pipette Filler
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Default Re: Wind changes earth rotation rate?

accroding to the nasa Because of Earth’s dynamic climate, winds and atmospheric pressure systems experience constant change. These fluctuations may affect how our planet rotates on its axis, according to NASA-funded research that used wind and satellite data.
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