Comments on: The power of the ocean http://hot-topic.co.nz/the-power-of-the-ocean/?utm_source=rss&utm_medium=rss&utm_campaign=the-power-of-the-ocean Global warming and the future of New Zealand Sat, 11 Feb 2012 07:28:16 +0000 hourly 1 http://wordpress.org/?v= By: Terry http://hot-topic.co.nz/the-power-of-the-ocean/comment-page-1/#comment-9894 Terry Fri, 22 Jan 2010 04:18:55 +0000 http://hot-topic.co.nz/?p=3927#comment-9894 Apologies, lost two letters on keyboard, cant spell properly. Spell check fixes some. Rob, I was tinkin in terms of meter provin and te measurement vessel, were gravity and temp are applied as corrections. If te volume of te proving vessel canes ten all te oter stuff is meaningless. You are rit, sould ave mentioned it. Sorry. Terry [H & G? - GR] Apologies, lost two letters on keyboard, cant spell properly. Spell check fixes some.

Rob, I was tinkin in terms of meter provin and te measurement vessel, were gravity and temp are applied as corrections. If te volume of te proving vessel canes ten all te oter stuff is meaningless. You are rit, sould ave mentioned it. Sorry.
Terry

[H & G? - GR]

]]> By: Rob Taylor http://hot-topic.co.nz/the-power-of-the-ocean/comment-page-1/#comment-9858 Rob Taylor Thu, 21 Jan 2010 15:13:52 +0000 http://hot-topic.co.nz/?p=3927#comment-9858 Terry, why do you omit another obvious and very relevant way to increase the fluid level, i.e. heating the liquid? I suspect that you do indeed have a dog in this hunt, but it is one that prefers not to notice elephants in the room... "There are two ways to increase the fluid level in a vessel, increase the quantity of liquid or decrease the volume of the vessel... I don't have a dog in this hunt" - Terry January 21, 2010 at 7:26 pm Terry, why do you omit another obvious and very relevant way to increase the fluid level, i.e. heating the liquid?
I suspect that you do indeed have a dog in this hunt, but it is one that prefers not to notice elephants in the room…

“There are two ways to increase the fluid level in a vessel, increase the quantity of liquid or decrease the volume of the vessel… I don’t have a dog in this hunt”
- Terry January 21, 2010 at 7:26 pm

]]> By: Dappledwater http://hot-topic.co.nz/the-power-of-the-ocean/comment-page-1/#comment-9855 Dappledwater Thu, 21 Jan 2010 11:37:02 +0000 http://hot-topic.co.nz/?p=3927#comment-9855 A recent draft paper utilizing GRACE satellite data (principally) sets out to chart weekly changes in mass of the Earth's oceans. They address the issue of Terry's "dents and dings", although parts of it are Greek to me. http://edoc.gfz-potsdam.de/gfz/get/14031/0/a81a2fc8ec563853b99231c20f52ebac/14031.pdf A much easier read, dealing with solid Earth features, is here: http://www.csr.utexas.edu/grace/gravity/solid_earth.html A recent draft paper utilizing GRACE satellite data (principally) sets out to chart weekly changes in mass of the Earth’s oceans. They address the issue of Terry’s “dents and dings”, although parts of it are Greek to me.

http://edoc.gfz-potsdam.de/gfz/get/14031/0/a81a2fc8ec563853b99231c20f52ebac/14031.pdf

A much easier read, dealing with solid Earth features, is here:

http://www.csr.utexas.edu/grace/gravity/solid_earth.html

]]> By: Gareth http://hot-topic.co.nz/the-power-of-the-ocean/comment-page-1/#comment-9849 Gareth Thu, 21 Jan 2010 08:51:39 +0000 http://hot-topic.co.nz/?p=3927#comment-9849 You don't have a dog, and I don't have a ready answer (though I do have a dog). I would suspect that the amount of continental crust (ie the stuff that floats higher than the rest, that we live on, not the new sea floor created at ocean ridging) has to remain more or less the same over long time scales, and that should mean that as long as the amount of water is fixed, the sea level wouldn't change too much. Continental crust that was dragged down in a subduction zone would tend to float back up over time, restoring whatever equilibrium exists. The timescales would be geological, though -- multi-million year. Sea level cycles through the recent ice ages are undoubtedly related to the volumes of water locked up as ice (or not), and the changes are so large (160m ish from memory) that they would swamp any longer term small change from tectonics. But I'm no expert. If I find a good source, I'll let you know. You don’t have a dog, and I don’t have a ready answer (though I do have a dog). I would suspect that the amount of continental crust (ie the stuff that floats higher than the rest, that we live on, not the new sea floor created at ocean ridging) has to remain more or less the same over long time scales, and that should mean that as long as the amount of water is fixed, the sea level wouldn’t change too much. Continental crust that was dragged down in a subduction zone would tend to float back up over time, restoring whatever equilibrium exists. The timescales would be geological, though — multi-million year. Sea level cycles through the recent ice ages are undoubtedly related to the volumes of water locked up as ice (or not), and the changes are so large (160m ish from memory) that they would swamp any longer term small change from tectonics. But I’m no expert. If I find a good source, I’ll let you know.

]]> By: Terry http://hot-topic.co.nz/the-power-of-the-ocean/comment-page-1/#comment-9845 Terry Thu, 21 Jan 2010 06:26:06 +0000 http://hot-topic.co.nz/?p=3927#comment-9845 Gareth; off topic but a question. There are two ways to increase the fluid level in a vessel, increase the quantity of liquid or decrease the volume of the vessel. The usual source of a decrease is various dents and dings. Is anyone aware of any research on changes in the ocean basis which would influence the resulting sea level absent any change in volume of the liquid, either up or down? An example could be the spreading center moving at a marginally higher rate than subduction and causing compression ridge, or moving less and causing thinning and stretching. Both are observed in various places on land, so they may or may not be common on the sea floor. I don't have a dog in this hunt and don't have a preferred outcome, but since this site has more interest in sea level than any other I have seen I thought you may have some insights. Terry Gareth; off topic but a question. There are two ways to increase the fluid level in a vessel, increase the quantity of liquid or decrease the volume of the vessel. The usual source of a decrease is various dents and dings.

Is anyone aware of any research on changes in the ocean basis which would influence the resulting sea level absent any change in volume of the liquid, either up or down? An example could be the spreading center moving at a marginally higher rate than subduction and causing compression ridge, or moving less and causing thinning and stretching. Both are observed in various places on land, so they may or may not be common on the sea floor.

I don’t have a dog in this hunt and don’t have a preferred outcome, but since this site has more interest in sea level than any other I have seen I thought you may have some insights.

Terry

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