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Arctic hit by direct heating bomb … Smallest sea ice area of all time
Changes in the sky ‘pole jet’ … The change of ‘arctic vibration’ intensifies
Arctic cold wave, 10-15 days below -15 ℃
[앵커]
The ‘arctic vibration’ is an important factor determining the intensity of the recent winter cold. When a ‘negative arctic vibe’ appears, a strong ‘arctic cold snap’ occurs in Korea like this winter. Fortunately, the chance of the ‘arctic cold snap’ reappearing in the rest of the winter is said to be not very high. Reporter Kim Jin-du reports. One of the regions most affected by global warming is the Arctic. As temperatures rise and fall, a major shift occurs in the Arctic skies, filled with sea glaciers. In the sky, a powerful vortex, ‘polar jet’, repeats its strength and weakness every tens of days or decades, which is called an arctic vibration. As the Arctic temperature rises and the Arctic Vibration Index turns negative, the ‘pole jet’ weakens and severe cold moves toward mid-latitude. This is the reason for the strong Arctic cold wave in East Asia, including Korea, this year. On the other hand, when it reaches a positive index, the ‘jet pole’ strengthens and the cold remains as it is, and it becomes an unusually cozy winter like last winter. Arctic cold waves are characterized by a drop in temperature below -15 degrees Celsius from Seoul and lasting from 10 days to nearly 15 degrees. There is a big difference between the general winter cold and ‘Samhansaon’. That is why the extreme cold of around -10 degrees Celsius, which appears this weekend and on holidays, is not called ‘Arctic Cold Wave’. Experts analyze that there is also a low probability that the ‘arctic cold wave’ will reappear during the rest of the winter. Moving forward, typical winter weather is expected to continue for two to three days after severe cold hits regularly. This is YTN Kim Jin-du.
