If a 100 megaton hydrogen Bomb went off above U.S. or Europe at 528,000 feet what would that do?

I cannot tell you precisely what it would do because this hasn't happened yet. 

For example, my concern would be (just off the top of my head) that it might blow half the atmosphere off the earth and leaving people without enough air to breathe unable to breathe. But, it doesn't mean the other half of the world would be able to breathe necessarily either. It's hard to say because it hasn't happened (YET).

So, if there is no air to breathe for living things on earth (or not enough of it) then it's a pretty stupid thing to do isn't it?

The atmosphere of earth functions a lot like the oceans of the world. So, what happens when nuclear devices have been set off in the Pacific Ocean at test Grounds on Islands?

This also might tell us something about what the atmosphere would do. However, the Atmosphere is 80% Nitrogen and the rest oxygen and other gases and smoke and stuff like that.

So, what an atmosphere would do if this force of 100 megaton Hydrogen bomb hit it might send a portion of the Atmosphere directly into outer space from the force of the explosion at 528,000 feet in altitude.