How might a life-sustaining planet exist with an "atmospheric ocean"?

This might be a little difficult to explain, but basically: the concept of "atmospheric ocean" is a gas that is found pretty much everywhere on the planet. Probably very dense and sinks to the surface, creating a gaseous ocean at low altitudes (such as in valleys).

Essentially, I'm trying to blur the line between a "sky" and a "sea" to make them both out of the same substance, while still making it able to sustain an ecosystem. Is this plausible?

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How might a life-sustaining planet exist with an "atmospheric ocean"?

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