Oh, ok. Thanks.
Tom, theres some serious issues with your "quasi-infinite plane of ice" idea. First off, per that, the water cycle is officially worthless as there is now an unlimited amount of water locked up in this ice.
More importantly, your idea regarding how the atmosphere stays in is flawed. Since air is a fluid, it will naturally shape itself to fill any container. Its a fundamental nature of fluids. if the earth were accelerating upwards, what would happen is that the air would be pushed down and flattened (you can simulate this with any visible fluid and an accelerating flat surface--a small amount of water, for example, held in a drop by its surface tension, will flatten and spread across the surface of a an object). Since air has no surface tension, this would be observed very quickly. Thus, since the wall is only 150 meters high, per you, all air above 150 meters would BECOME UNBREATHEABLE because it would be so thin and rapidly moving. Now, Mr. Bishop, I'm writing this post from 150 meters above sea level, and i've climbed mountains in excess of 1500 meters (Mount Washington, White Mountains, NH--1886 meters), and i'm breathing just fine. There are no winds flattening the landscape as the fluid air rushes to fill the empty space around it, forced to do so by acceleration and barometric differences.
So.... how does that work?