I am curious as to what physical geographic features would be present on a plateau 10km above sea level. The Tibetan plateau is only 4km above sea level, so would more than doubling the height exaggerate the geographic features we already see in Tibet, or would new and strange climates and temperature start to form?
10km is waaaaaaay too high. On your world-building dashboard you have taken one of the dials, thought about turning it up to 11, and instead turned it up to 48.
But it is an interesting experiment to think about: what are the physical effects here?
- Too heavy for the crust/mantle to support: The Himalaya and tibetan plateau are the biggest features Earth can support. Their height is facilitated by continental collision that can push up the thickened crust against the HUGE desire to sink down into the mantle like an icecube bobbing in a glass of water. You need a fundamentally different kind of tectonics to support this kind of feature, meaning a planet that is either old or small, such that it has cooled off and has a thick elastic crust atop the viscous mantle (eg. Mars).
- VERY COLD: The atmosphere is, on average, 6.5K colder per Km elevation. So you are 65 Kelvin colder than sea-level on that plateau.
- Not even normal atmosphere: 10km is near a point we call the tropopause, meaning the atmosphere is so thin that its temperature is no longer kept in a normal thermal distribution by collisional dynamics, and is instead radiatively-dominated. That doesn't actually affect much if you're living in it -- just feels like cold, thin air -- but I want to highlight HOW thin and cold that air is.
- Messes up global winds: 10km wall? I can't even picture what than plateau does to airflow. Blocking global air circulation with an insane Rossby wave on the leeward wide? huge hurricane force gusts as air descends off the edge of the plateau? Some continual push of air to the outer edge of the plateau? Very disruptive to the global system.
According to this source, the climate up there would be extremly harsh, at temperatures around -35°C with strong winds. Because of the thin air in these heights, those may won't feel as strong as at ground level. Nothing would be able to survive in such heights, as this is even worse than the arctic climate.