WHAT IS ARCTIC CYCLONE POLAR VORTEX GLOBAL WARMING FREEZER UNITED STATES 2014
WHAT IS A POLAR VORTEX
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NASA FOOTAGE OF THE NORTH POLE, BAFFIN ISLAND, ARCTIC CYCLONE, POLAR VORTEX SHOWN IN DEATAIL AND TELLING YOU WHAT IT IS AND HOW IT FORMS.
presented by Bill Keefer
A study in 2001 found that stratospheric circulation can have anomalous effects on the weather regimes. A study published in 2004 found a mechanism to explain how the strength of the stratospheric polar vortex influences circulation in the troposphere. Researchers found a statistical correlation between weak polar vortex and outbreaks of severe cold in the Northern Hemisphere, the study was first reported in 2001. A 2007 study focused on the effects of polar cyclones on drought in Australia. In the past years more studies started to investigate a link between polar vortex and jet stream changes and extreme weather, after more pronounced anomalies have been observed. Many studies assess the connection of sea ice decline and responding interactions.
Panning along a SeaWiFS image from the Hudson Strait past the coast of Baffin Island in northern Canada. Animator: Greg Shirah (NASA/GSFC). Scientist: Gene Feldman (NASA/GSFC). Platforms/Sensors/Data Sets: SeaStar/SeaWiFS. NASA
A polar vortex (also known as an Arctic cyclone, sub-polar cyclone, and a circumpolar whirl) is a persistent, large-scale cyclone located near either of a planet's geographical poles. On Earth, the polar vortices are located in the middle and upper troposphere and the stratosphere. They surround the polar highs and lie in the wake of the polar front. These cold-core low-pressure areas strengthen in the winter and weaken in the summer.[1] They usually span 1,000–2,000 kilometers (620–1,240 miles) in which the air is circulating in a counter-clockwise fashion (in the northern hemisphere). As with other cyclones, their rotation is caused by the Coriolis effect.
The Arctic vortex in the Northern Hemisphere has two centres, one near Baffin Island and the other over northeast Siberia. In the southern hemisphere, it tends to be located near the edge of the Ross ice shelf near 160 west longitude. When the polar vortex is strong, the Westerlies increase in strength. When the polar cyclone is weak, the general flow pattern across mid-latitudes buckles and significant cold outbreaks occur. Ozone depletion occurs within the polar vortex, particularly over the Southern Hemisphere, which reaches a maximum in the spring.
The weather phenomenon hogging all the attention now is "polar vortex."
Twenty-six states are under wind-chill warnings or watches, and the polar vortex is to blame, breaking loose from its North Pole confines and plunging the country in a deep, dangerous freeze.
