( ( The ( cooling trend ) ) ( ( reverses ( in ( ( ( the stratosphere ) , ) ( ( the layer ) ( of ( ( the atmosphere ) ( above ( the troposphere ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (VBG cooling) (NN trend)) (VP (VBZ reverses) (PP (IN in) (NP (NP (DT the) (NN stratosphere)) (, ,) (NP (NP (DT the) (NN layer)) (PP (IN of) (NP (NP (DT the) (NN atmosphere)) (PP (IN above) (NP (DT the) (NNP troposphere))))))))) (. .)))
The cooling trend reverses in the stratosphere, the layer of the atmosphere above the troposphere.
(ROOT (S (NP (DT The) (NN stratosphere)) (VP (VBZ is) (NP (NP (DT the) (NN layer)) (PP (IN above) (NP (DT the) (NNP troposphere))))) (. .)))