Why is the cold wave of 20 16 called "century cold wave"

Since the catastrophic cold wave disaster of 199 1, there has been no comparable severe cold wave disaster in East Asia for the time being. Then, let's make some comparisons and compare the difference between the coming 20 16 catastrophic cold wave disaster and the 199 1 catastrophic cold wave disaster.

The first is the situation; There is no doubt that the culprit of 199 1 cold wave weather is the polar vortex, which lurks in the north of China and accumulates a lot of extremely cold air to vent.

The left picture shows the weather situation in East Asia in 2065438+2006 and 65438+23 10 predicted by ECMWF (European Medium Range Forecast), and the right picture shows the NCEP reanalysis situation of 199 1 cold wave weather process.

We can see that in 20 16 65438+23 10, the main body of the deep purple polar vortex is located in the northeast of China, while in 199 1 year, the main body of the polar vortex is located in Inner Mongolia, so the cold polar vortex shelf is above our heads, and the favorable weather situation pushes the polar vortex down.

The second is the degree of influence.

The left picture shows the East Asian weather situation predicted by ECMWF (European Medium Range Forecast) in 2065438+2006 and124 October, and the right picture shows the NCEP reanalysis situation map of 199 1 cold wave weather process.

There is a thick white line, representing the zero line at a height of 850 hectopascals. It can be seen that the possible impact of this cold wave will not be less than 199 1 year, and the position of the zero line of 850HPA is even more southerly than 199 1 year, but relatively lower than the low temperature range and degree of 1996544. In contrast, the westerly wind in the south branch, like 199 1, has come to a low point, but we should pay attention to the position of the subtropical high. The subtropical high of 20 16 is farther north than that of 199 1, and the warm and humid conditions are more active. I think that in the past few months, the south has felt more or less biased.

Through this comparison, you may know why this cold wave is called the "century cold wave"