#### Comment Preferences

• ##### That depends entirely on the amount of(1+ / 0-)
Recommended by:
corvo

pressure the methane that is currently under the sea bed has doesn't it?

negligible in the calculation of pressure at depth
• ##### No you're missing the physical point.(4+ / 0-)

Calculation of the pressure a depth in water in the ocean above the bottom where the methane hydrates would be only depends on the depth and the density of water.   The change volume density of water with both temperature and pressure are negligible,

Calculation of pressure at depth only depends on the atmospheric pressure at the suface, the depth and the volume density of water...and has nothing to do with the presence of methane hydrates on the bottom.

• ##### Are you trying to claim(2+ / 0-)
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Calamity Jean, corvo

Raising the surface temperature of air above an ocean will have zero impact on water temperature?

Really?

Did someone put a dunce sign on my back while I wasn't looking?

• ##### No(6+ / 0-)

No, they're saying that hot water weighs practically the same as the same volume of cold water (likewise the air on top of the water). And that the pressure of methane, or anything else, under the water is a result of the weight of the water on it, but doesn't pressurize that water any more than any other unyielding floor would.

You're wrong on this.

"When the going gets weird, the weird turn pro." - HST

[ Parent ]

• ##### Methane hydrates will have no effect on (2+ / 0-)
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erush1345, blue aardvark

the actual water pressure at depth, but the pressure at depth will always have a considerable effect on both the formation of, and maintenance of, methane hydrates on the ocean bottom.

• ##### The claim is that the weight of a column of water(1+ / 0-)
Recommended by:
Fiona West

depends on the volume and the density, which is true by definition, and that water density does not vary too much with temperature, which can be looked up.

Think of the water as the "mercury" in a thermometer. When it warms it gets a little taller but the weight at the bottom doesn't change.

Economics is a social *science*. Can we base future economic decisions on math?

[ Parent ]

• ##### But(0+ / 0-)

The methane being sequestered in the sea bed has no such restrictions.

• ##### I do not see your point(0+ / 0-)

The pressure experienced by the CH4 at the bottom will remain nearly constant regardless of surface warming of the water. That is my point. The pressure surrounding the solid methane is not going to change.

The state change of CH4 from solid to gaseous, a.k.a. sublimation, depends upon the pressure and temperature. If the pressure is constant sublimation will occur as a result of temperature changes, which requires a model of temperature at the point in question - a hunk of sea floor on the north shore of Siberia will have a different temperature model than a hunk of sea floor at the bottom of the mid-Pacific.

Given constant pressures we have to ask where CH4 solids are deposited where the temperature might change. I think in general that's going to be shallow waters where a protective layer of ice has been removed.

Economics is a social *science*. Can we base future economic decisions on math?

[ Parent ]

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