Winter Snow In China East

The earth has been becoming warmer and warmer according to the temperature monitor records in recent decades. But the stmophere temperature does not support this view recently.
According to the law of nature, the sunny and wet air from western Pacific would flood into every corner of JiangNan regin (JiangSu, ZheJiang,AnHui province) in China at this time, but this regin is covered with heavy snow now. Why does this happen?

For simplicity, we only consider the North Earth.
As we know, the broiling sunlight heats the sea water at the ocean surface near the equator. The warmed sea water flows from the equator to the North Pole and brings the heat to NorthEarth. This is why we can live in mid and high latitudes.

    Warmer water is colded into ice by iceberg of North equator. The salt is separated into water and  make the water become high density. In the vertical direction, more and more heavier water gather and become a vertical flow to mid deep or even bottom of the sea.  It is easy to understand that a cold flow to equator  will appear to form a closed loop water transptation. This water transptation keeps balance for tens of thousands of years

It is unfortunately this balance was destoried and the vertical flow has become weaker and weaker because of warmer earth and vanishing iceberg. During the past winter, the sea water has not bright in enough heat from equator and bright out corresponding cold water. The equator has become colder and colder. At last, the cold air charged into high and mid latitudes and met the wet air from east Pacific.