“The polar vortex over the Arctic usually locks in cold air at the poles and does not easily move south. The stronger the winds, the more the air inside is kept, and the colder it gets,” explained lead researcher Dr. Judah Cohen, who’s a professor at the Massachusetts Institute of ...
阅读理解关键词:polar vortex语篇类型:说明文词数:310难度:★★★建议用时:8分钟正确率/4Record cold weather in the United States is forcing schools8. What made people feel colder than itand businesses to close. The "polar vortex(极地涡旋)", as it isreally was in Chicago, Illinois?called, has...
but can become dramatically wavier when it'sdisturbed by strong storm activity or encounters masses of hot or cold air.But this winter season, the meandering jet stream has not knocked the polar vortex off its pole, explained Lang.Instead, the jet stream has bent dramatically south, right thro...
Asia, and the Eastern U.S., and anomalously warmer temperatures over the Canadian Arctic and subtropical Asia," explained NOAA's Butler. (These temperature contrasts are based on where the jet stream, which separates cold air from warmer air, tends to get nudged by a disturbed polar vortex....
“The polar vortex over the Arctic usually locks in cold air at the poles and does not easily move south. The stronger the winds, the more the air inside is kept, and the colder it gets,” explained lead researcher Dr. Judah Cohen, who’s a professor at the Massachusetts Institute of ...
“polar vortex,” a mass of frigid air that is usually over the Arctic, was to blame. It gets the name vortex because it turns counterclockwise, like a hurricane. When this low-pressure air system is weakened, which can happen when temperatures are warm, the polar vortex can push cold ...
shrinks. Chen pointed out that this weakens the western wind in middle latitude regions thus weakening its ability to prevent cold waves from going south, which, combined with the increasingly frequent unstable polar vortex that unleashes more cold waves, the frequency of cold weather naturally gets...
For as long as we have had weather records (extending back into the 1800s), lobes of cold air rotating generally from west to east around the polar vortex sometimes extend down into the U.S. causing wild winter weather and general unpleasantness. ...
An interesting occurrence of a Rossby wave breaking event observed during the VORCORE experiment is presented and explained. Twenty-seven balloons were launched inside the Antarctic polar vortex. Almost all of these balloons evolved in the stratosphere around 500K within the vortex, except the one ...
Ok! (HealthDay)— As a giant polar vortex sweeps down over most of the United States, bringing with it temperatures so frigid that frostbite and hypothermia can happen within minutes, doctors have some advice for those who dare to venture outside. ...