The flow of this circulation has been strengthening at a rate of about 1.7% per decade. For 10 points each:
[10h] Name this global circulation with a meridional cell in each of the Northern and Southern hemisphere with air rising in the tropics before moving polewards and sinking into the extratropical troposphere.
ANSWER: Brewer-Dobson circulation
[10e] The Brewer-Dobson circulation was postulated to explain stratospheric distributions of water vapour and this chemical. The amount of this compound is measured in ‘Dobson’ units and it is mostly found in a namesake ‘layer’ of the stratosphere. CFCs are largely responsible for the depletion of this compound from the atmosphere.
ANSWER: ozone
[10m] The troposphere-stratosphere boundary is defined by an ‘inversion’ of this quantity. This quantity normally decreases with altitude but increases with altitude in the stratosphere, because the larger ozone concentrations absorb more energy from UV rays.
ANSWER: temperature