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China National Geographic Network, 2022

Only by satisfying the "time, geographical interest, people and harmony", "ice dumplings" will eventually form a Lantern Festival. The residents of the Four Sea Lakes will put the large blessing and couplet on the "dumplings", and the white "ice dumpling circle" The couplet with fiery red creates a stronger festive atmosphere (photography / Zhao Chunjiang). According to Yang Fengtian and Chen Yaoxuan from Jilin University Geology and Hydrological experts, the formation of "ice dumplings" is mainly controlled by meteorological conditions, lake landforms and lakes. The balance can be formed. The key factors may include: Meteorological conditions: In early November 2021, the Northeast China encountered heavy snow and strong winds, which was called a century.

The snowfall in the area lasts for five days, and the thickness of the snow can reach 1 meter.

The snowfall landed on the lake, and its outer layer was infiltrated and gradually frozen to form a snow mud cluster (mixture of snow, ice, and water); under the action of lake water fluctuations caused by the wind to the west of the north, the cluster continued to roll , And form a round, secondary sphere under the outer frozen effect.

Lake landforms: The Four Sea Lakes are located in the front edge of the Gong’er River rushing to the flood. It is an excretion area of ??the groundwater. There are a large number of lakes and wetland distribution in the surroundings. They are connected from the canals or river channels. In addition, the Four Sea Lakes include the east and west lakes. The two are connected through the gate, which has a certain orientation effect on the flow of water. Essence The water depth is shallow here, and the lake water fluctuates strongly, which is conducive to the snow mud cluster rolling into a ball. The nature of the lake: the four seas and lakes are low -lying, and the water supply is received by precipitation, surface runoff, and regional groundwater. The lake water is poorly excreted in the form of evaporation, which further concentrates and becomes a saltwater lake. When the snow mud cluster is formed, the surface water temperature is slightly lower than 0 ° C.

At this temperature, the lake failed to freeze and the snow mud cluster failed to melt. This delicate balance allowed the gathering to exist.

After the cluster rolled into a ball, as the temperature decreased, the lake gradually frozen, and the snowy ball was sealed in the ice.

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