How dense of an atmosphere do I need to "float" an ocean of liquid at 1000 ft elevation?

I recently watched a special on cave divers in the Yucatan Peninsula and part way through that show the divers encountered a feature called a Halocline, a meeting of two different water masses of differing salinity. It looked like a mirror, or a surface in the middle of the water. This sparked an idea for a planet:

This planet features an "ocean" of a yet to be determined liquid that is about 100ft thick and suspended above a denser and warmer atmosphere below it.

What liquid should be used and how dense would that atmosphere have to be to float that liquid?

Is there a better way to get the desired effect (like a mirror or a surface in the sky) without floating a liquid?

You may change details of the setup (pressure, liquid depth ect.) if those details lend you different results.

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How dense of an atmosphere do I need to "float" an ocean of liquid at 1000 ft elevation?

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