I have a hypothetical situation, and I am specifically interested in how this situation would affect the weather.
I have asked this question elsewhere, however I feel that nobody with any expertise on weather systems or meteorology has responded to my question. So I was hoping that someone here could help me out.
The hypothetical situation is as follows:
Positioned above a large landmass on Earth (America or Russia for instance) is an immense flat disc, at least two thousand miles in diameter. It is thin and has comparatively little weight or mass, but it is also opaque and does not let any light through.
This flat disc is positioned roughly 40-50 miles away from the surface of our planet, and the object is locked in with the rotation of the Earth so that it says above the landmass. This disc blocks any sunlight hitting it from reaching the surface.
In such a hypothetical situation, what effects would this disc have to our atmosphere and weather?