Observations of the poleward branches of the Hadley Cells and the edge of the tropics show
a robust poleward shift since about 1980, often referred to as a widening.
Not exact matches
The
poleward shift of the Southern Hemisphere middle latitude jetstream in response to increasing carbon dioxide is one of the most
robust circulation responses found in climate change experiments, and is predicted to occur during all seasons (IPCC, 2007c).
The thing is that as regards the sequence of observed events leading to changes in tropospheric temperature trends and the cyclical
poleward and equatorward
shifts in the air circulation systems the NCM is pretty
robust.