Why do you always talk about the cold current from Lake Baikal?

The reason is that Siberia is the source of winter wind, which is also the source of cold air. The reason is that Siberia has high latitude, large land area, rapid cooling in winter and low temperature, so the air pressure is very high, which is the highest in the world in winter. Under the influence of this high pressure, the air flows to the low pressure, forming cold air from the north, which is the cold current. Lake Baikal is a place where cold air goes south, so it is often said.