For 10 points, name this layer of the atmosphere below the mesosphere and above the troposphere.
In this region, gravity waves drive both the quasi-biennial and semiannual oscillations that occur near the equator. Hydrogen gas in this layer is thought to be among the most isotopically enriched materials on Earth, as it contains over thirty percent more deuterium than hydrogen near the earth's surface. This region of the atmosphere is an inversion layer, where temperature increases with height due to the presence of ultraviolet rays. For 10 points, name this layer of the atmosphere below the mesosphere and above the troposphere.
In this region, gravity waves drive both the quasi-biennial and semiannual oscillations that occur near the equator.
stratosphere