Once Again Once Againetidal Friction Progress in Oceanography

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Is it possible to have tidal currents in the Earth's molten mantle?

• Thread starter Gannet
• Showtime date Oct 23, 2011

Since the tectonic plates ride on the convection currents in the molten mantle, I was wondering if tidal furnishings could create currents in the molten mantle.

The reason I am asking I found this http://bowie.gsfc.nasa.gov/ggfc/tides/intro.html" [Broken]
where it states:

The tidal braking in the earth's rotation is really caused primarily by friction in the oceans, where "friction" may refer to any number of concrete mechanisms which have however to be determined definitively. For case, lesser friction, induced by tidal currents flowing beyond the seabed, various kinds of wave breaking, and scattering of tidal waves into oceanic internal waves are all thought to play a part. For a contempo overview of this subject area, look upward Walter Munk's paper "Once more: again--tidal friction," published in Progress in Oceanography, vol. forty, pp. 7-36, 1997.

This made me wonder if in that location tidal currents in the molten drape that the tidal friction with tectonic plates would be significantly greater than the tidal friction created past the oceans.

Last edited by a moderator: May five, 2017

Answers and Replies

The scientists at NASA are very qualified people and I am certain that they considered all possible sources of tidal friction. Therefore, since they said "tidal braking in the earth'south rotation is actually acquired primarily by friction in the oceans" that this must be the case otherwise how embarrassing would it be if someone on some forum discovered something that they missed.

The scientists at NASA are very qualified people and I am sure that they considered all possible sources of tidal friction...

Thanks for replying. I would promise your statement is true and not just "...the light is ameliorate here."

Since the tidal potential deforms the entire earth. It seems to me qualitatively that more than of tidal potential would be dissipated in the solid earth than in the ocean. Withal, the main stream believes

Most of the tidal energy dissipation is believed to occur in the oceans. It is still non entirely articulate whether nearly of the dissipation occurs in shallow seas or in deep oceans.

from http://www.geo.ucalgary.ca/~wu/Goph681/EarthRotation.pdf"

Last edited past a moderator: Apr 26, 2017

Since the tectonic plates ride on the convection currents in the molten mantle, I was wondering if tidal effects could create currents in the molten drape.

The reason I am asking I establish this http://bowie.gsfc.nasa.gov/ggfc/tides/intro.html" [Broken]
where it states:

This made me wonder if there tidal currents in the molten mantle that the tidal friction with tectonic plates would be significantly greater than the tidal friction created past the oceans.

This is not something I claim to know very much well-nigh.

With that caveat, it seems to me that the viscosity of the mantle is also loftier to allow dissipation by currents. Even so, I believe that some tidal energy is dissipated past heating the pall.

Last edited past a moderator: May five, 2017

Since the tectonic plates ride on the convection currents in the molten mantle, I was wondering if tidal effects could create currents in the molten mantle.

First things first: What molten mantle? The Globe's curtain is a solid (it supports shear waves) that is capable of plastic flow over geological time spans.

The reason I am request I constitute this http://bowie.gsfc.nasa.gov/ggfc/tides/intro.html" [Cleaved]
where it states:

The tidal braking in the earth's rotation is actually caused primarily by friction in the oceans

Y'all missed the key discussion "primarily". They did not say "exclusively".

This made me wonder if there tidal currents in the molten mantle that the tidal friction with tectonic plates would exist significantly greater than the tidal friction created by the oceans.

The cardinal trouble in your reasoning is your employ of the term "molten mantle". Over very long time spans (geological time) the drapery appears to exist plastic. Over very short time spans such as those resulting from tidal interactions, the drape is better modeled as an elasto-rigid body with a modest degree of anelasticity.

Only every bit the oceans are subject to tides from the Moon and the Lord's day (and to a lesser extent the other planets), and then is the Earth itself. The same tidal forces that result in the bounding main tides also affect the Earth as a whole. Google the terms "Earth tides" and "solid trunk tides" for more. The Globe tides are for the about part loss-free because the Earth as a whole is mostly rubberband on the time scales of the tides (hours to decades). The modest amount of anelasticity in the drapery will lead to some losses, simply these are small compared to those resulting from the ocean tides.

Concluding edited past a moderator: May 5, 2017

Cheers Billiards & D H for your comments

From Billiards

...it seems to me that the viscosity of the drapery is too high to permit dissipation by currents. However, I believe that some tidal energy is dissipated by heating the mantle.

The post-glacial bounce in 11,000 years indicates to me though highly pasty that flow does exist. Also, tidal heating to me betoken friction which indicate that there is an opposing forcefulness to movement. Peradventure the solid earth tidal bulging is inducing that movement.

From D H

Yous missed the cardinal word "primarily". They did not say "exclusively".

I know information technology is not exclusively, I was challengining the discussion "primarily" which in my terminology means the #1 contributor. I have non found any paper all the same that substantiate that claim.

Concluding edited: Oct 25, 2011

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