The phrase "upper stratosphere" refers to the highest part of the stratosphere, a layer in the Earth's atmosphere. It denotes the region that is located farthest away from the ground. Full definition
Pressure fell and upper stratosphere temperature above the pole rose strongly from 1948 to the early seventies and jumped in 1978 at the time of the Great Pacific Climate Shift. (judithcurry.com)
Our group has taken a middle - ground approach by using high - altitude aircraft that can fly up into the high upper stratosphere where the sky is much darker, making the vulcanoids easier to detect. (discovermagazine.com)
While there are difficulties in modelling the O3 depletion in the global stratosphere (WMO, 1999), this study reiterates the need to be cognisant of the role played by the vertical profile of O3 loss amounts in the entire stratosphere, i.e., middle and upper stratosphere as well, besides the lower stratosphere. (ipcc.ch)