Tja. Uit dit artikel van de Guardian:
This in turn narrows the temperature difference between the Arctic and lower latitudes, which is crucial because it is the temperature gradient between them that drives the jet stream wind, which streaks around the pole at up to 250mph and about 8km above the surface.
The jet stream forms a boundary between the cold north and the warmer south, but the lower temperature difference means the winds are now weaker. This means the jet stream meanders more, with big loops bringing warm air to the frozen north and cold air into warmer southern climes.
Furthermore, researchers say, the changes mean the loops can remain stuck over regions for weeks, rather than being blown westwards as in the past. This “blocking” effect means extreme events can unfold.
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