circumpolar westerlies

circumpolar westerlies

[¦sər·kəm′pō·lər ′wes·tər‚lēz]
(meteorology)
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Warming of the lower stratosphere would slow the circumpolar westerlies but strengthen winds at lower latitudes, a combination that would significantly shift weather patterns.
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.
Circumpolar westerlies usually snake above the Eurasia continent allowing cold air to move southward, the agency said, adding that this winter they are blowing from west to east, blocking the cold air, resulting in the high-temperature phenomenon seen once every 30 years.