Since the end of July, the sea temperature in the eastern part of the Pacific equatorial region has begun to show an unusually colder trend. The average sea temperature has fallen below 0℃ at the end of July to now below -0.6℃, which shows that the ocean in the eastern equatorial Pacific Ocean The emergence of a relatively violent upward movement of the sea water causes the lower temperature of the sea water to float on the surface, which makes the sea temperature of a large area of the sea appear low. The area of this low temperature zone exceeds that of South America, so it will have a greater impact on the earth's climate.
Sea temperature
Why is the sea temperature abnormally low?
or what caused the sea to turn up. In fact, it is a normal phenomenon for the sea to turn up. The wind on the surface of the ocean will blow away the seawater in an area and there will be seawater floating up to supplement it. Once the wind becomes stronger and continues to strengthen, there will be abnormal winds that will increase the upturn of the sea. The stronger the wind means that the air pressure difference becomes larger. After all, the difference in air pressure during the wind is like water flowing to a low place to form a stream, and air to a low pressure area to form wind. The direct cause of the increase in air pressure difference is the warming of the climate, which causes the temperature of the sea to rise. The air on the sea surface is heated by the sea and the sun and flows upwards, so that the air on the sea surface becomes sparse and the pressure decreases, and the surrounding air will be supplemented and formed. wind. Therefore, a period of time before the seawater temperature becomes lower, the seawater temperature will basically appear to be higher.
La Niña circulatory system
In this way, the occurrence of La Niña is still related to climate warming, and once the sea temperature in the eastern equatorial Pacific is lower than -0.5°C for more than 5 months, it will form once La Niña phenomenon, and the impact of La Niña on our country is not that the temperature of the sea is lowered, but that the warm sea water blown away by the wind will accumulate in the western Pacific, allowing warm and humid air currents to appear in the western Pacific, and parts of our country will appear in winter. The phenomenon of excessive precipitation, once encountered with cold air, will give rise to continuous snowfall.
The emergence of La Niña indicates that the climate is abnormal, which will make the atmospheric movement abnormal in winter, which may cause the Arctic cold vortex to go southward and increase its intensity. Therefore, a cold winter occurs. However, not every time La Niña is accompanied by cold The appearance of the winter phenomenon,Sometimes there will be warm winters, but the probability of cold winters in La Niña years will be greater, but we are not very clear about the true logical relationship of cold winters.
La Niña Index
Therefore, whether this winter will be cold or not, in fact, it may be predictable from the continuous high temperature in the area south of the Yellow River in the past few days. Extreme warmth can be verified, after all, the temperature needs to be tempered. Combining these phenomena, it can be predicted that the possibility of cold this winter is higher, but if the snow is not too big, it is impossible to know. After all, snow is an excellent combination of cold air and warm air. It is extremely difficult to predict. It can only wait for winter. Look at the approaching forecast later.
snow
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