[기상센터][날씨] ‘Arctic vibration’ that breaks the cold wave…”There is no other winter”

[앵커]

‘Arctic vibration’ is an important factor that determines the intensity of the recent winter cold.

When a’negative arctic vibration’ appears, a strong’arctic cold wave’ occurs in Korea like this winter.

Fortunately, it is said that the possibility of the’arctic cold wave’ reappearing in the rest of winter is not very high.

Reporter Kim Jin-du reports.

[기자]

One of the regions most affected by global warming is the Arctic.

As temperatures rise and fall, a major change occurs in the skies over the Arctic, filled with sea glaciers.

In the sky, a powerful vortex,’pole jet’, repeats its strength and weakness every tens of days or decades, which is called the arctic vibration.

As the Arctic temperature rises and the Arctic Vibration Index turns to negative, the’pole jet’ weakens and a strong chill is pushed down to 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’pole jet’ is strengthened and the chill remains as it is, and it becomes an unusually cozy winter like last winter.

[반기성 / 케이웨더 예보센터장 : 온난화의 역설이라고 하죠, 북극 한기가 매년 중위도까지 남하하며 겨울이 무척 추워지는 현상이 반복되고 있습니다.]

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’.

This is why the extreme cold of around -10 degrees Celsius, which appears on 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 winter.

In the future, it is expected that the typical winter weather will continue after a period of strong cold arrives, which lasts for about two or three days and then clears up.

This is YTN Kim Jin-du.

[저작권자(c) YTN & YTN plus 무단전재 및 재배포 금지]

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