circumpolar westerlies

circumpolar westerlies

[¦sər·kəm′pō·lər ′wes·tər‚lēz]
(meteorology)
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The strong circumpolar westerlies that define the stratospheric polar vortex maximize at around 60[degrees] latitude, from just above the tropopause (-100 hPa) into the mesosphere (above 1 hPa; see Fig.
That temperature gradient is the driving force for strong, steady winds that blow from the west over the seas off Antarctica's coast at latitudes of about 50[degrees]S--the circumpolar westerlies.
The model that Perlwitz's team used suggests that ozone-related heating of the stratosphere triggers the same cascade of effects that Son's team now reports: the circumpolar westerlies weaken, enabling more storm systems to breach that barrier and bring warm winds to Antarctica.
Recent abnormally warm weather in Asia and Europe is due to circumpolar westerlies which have prevented cold air above the arctic circle from moving southward, Japan's Meteorological Agency said Wednesday.