In a world where two enormous cities are built one on top of the other, what would weather be like in between?

Aliens build their city on Earth in such a way that it covers the entire planet but leaves the surface of the planet (including human cities) intact.

This is possible since they built their alien city on a huge platform which is supported by pillars rammed into the Earth's crust.

So with exception of the locations of these pillars the Earths surface remains as it was before the aliens arrival.

I'm interested in how such a city would impact the Earth's weather (I have intended for the alien city to be to be at a height of approximately 12 miles).

You can disregard the problem of sunlight as in how it could reach the ground since the alien city is in its way (the city will somehow let it through). Also disregard the problem of waste heat.

And a few notes: the city is built from extremely light but stable and firm material. I have intended that there are to be 12 pillars that hold up the city, which are located in the ocean and vast unpopulated areas such as deserts.

How would weather and other natural occurrences be affected in such a world? What type of weather patterns would the pillars produce?

posted over 7 years ago

JanT‭

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