Troposphere
The troposphere is the lowest region of a planet's atmosphere.

In 2161, Ensign Travis Mayweather warned the occupants of  that the shuttlepod was entering the troposphere of Rigel X, a planet in the Rigel system and that the shuttlepod would experience some turbulence. ()

In 2365, Anya of Daled IV tried contacting the , but was having trouble getting through to them due to the planet's troposphere distorting the Enterprises signal. ()

In 2370, the  became trapped in the atmosphere of Marijne VII, a gas giant, below the planet's troposphere. ()

Later that year, Lieutenant Commander Data reported to Captain Jean-Luc Picard on the Enterprise-D that Boraal II's troposphere was beginning to break down due to plasmonic reactions. ()

In 2373, the Sacajawea, carrying Neelix, Tuvok and Sklar descended through the troposphere of a planet populated by the Nezu. ()

In 2378,  Tom Paris piloted the  10,000 meters into the troposphere of an unidentified planet so the ship could to try to remove radiation from the atmosphere using modified photon torpedoes. ()

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Meteorology