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So I guess I'm asking the same question. What about it? Would raising the ocean levels up to just over 29,000 feet have a major impact on the atmoshpere?
Why would it? If I dug 29,000 feet of crust off the planet and sent it somewhere else, so that every point on Earth is now 29,000 ft lower, what difference would it be to the atmosphere? It would simply move in closer, and be under slightly more pressure because it is now 29,000 ft closer to the Earth's center of gravity. Further, if I pushed the bottom of the atmosphere up 29,000 feet the effect would be the same, and still minimal.
Suppose I have a glass tube that's 30,000 ft tall. The base of the tube is at sea level. The pressure stratification of the atmosphere inside is identical to the stratification outside. I seal both ends and carry it up to the summit of Everest. The same amount of air is still in the tube, and it is still stratified. The air at the base of the sealed tube is nearly at the same pressure it was at when the tube was at sea level. The slight difference is because the air is now further away from Earth's center, and, to put the difference in perspective, is directly proportional to the difference of my own weight at this altitude.
We instinctively believe that there must be "some" significant difference because of our personal experiences that the air at altitude is "different". But that misleads us under these conditions.
[This message has been edited by gene90, 12-19-2003]