Brewer–Dobson circulation refers to the global atmospheric circulation pattern of tropical tropospheric air rising into the stratosphere and then moving poleward as it descends. The basics of the circulation were first proposed by Gordon Dobson and Alan Brewer. The term "Brewer–Dobson circulation" was first introduced in 1963. This circulation pattern explains observations of ozone and water vapor distribution, and has been accelerating in recent decades, likely due to climate change.
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👉 Brewer–Dobson circulation in the context of Homosphere
The homosphere is the layer of an atmosphere where the bulk gases are homogeneously mixed due to turbulent mixing or eddy diffusion. The bulk composition of the air is mostly uniform so the concentrations of molecules are the same throughout the homosphere. The top of the homosphere is called the homopause, also known as the turbopause. Above the homopause is the heterosphere, where diffusion is faster than mixing, and heavy gases decrease in density with altitude more rapidly than lighter gases.
Some of the processes driving this uniformity include heating convection and air flow patterns. In the troposphere, rising warm air replaces higher cooler air which mix gases vertically. Wind patterns push air across the surface mixing it horizontally. At higher altitudes, other atmospheric circulation regimes exist, such as the Brewer-Dobson circulation in the terrestrial stratosphere, which mixes the air. In Earth's mesophere, atmospheric waves become unstable and dissipate, creating turbulent mixing of this region.