When will the fog in East Lake appear?

From April to October every year, the fog on the Jiang Xiaodong River looks like an hour after sunset. The principle of fog formation is the temperature difference between water and atmosphere. Jiang Xiaodong River is called a small glacier, and its water flows from the bottom of Dongjiang Lake dam (100 meters), and the water temperature is between 12 and 17 degrees all the year round. Dongjiang Lake claims that there will be fog in Dadongjiang River, but the fog after rain will be beautiful, especially in April and October, especially in mountainous areas.

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1. When the relative humidity reaches 100% under the conditions of sufficient water vapor, light breeze and stable atmosphere, the water vapor in the air will condense into tiny water droplets and be suspended in the air, which will reduce the ground visibility. This weather phenomenon is called fog. Fog is more common in spring from February to April. When the visibility in the atmosphere is lower than 1 km due to the condensation of suspended water vapor, meteorology calls this weather phenomenon fog. Conditions for fog formation: cooling, humidifying and increasing water vapor content. The types of fog are radiation fog, advection fog, mixed fog, evaporation fog and smoke.

2. the reason

When the water vapor contained in the air reaches the maximum, it reaches saturation. The higher the air temperature, the more water vapor it contains. 1 m3 air, the maximum water vapor capacity is 6.36g at 4℃; When the temperature is 20℃, the maximum water vapor content in 1 m3 air is17.30g. If the air contains more water vapor than saturated water vapor at a certain temperature, the excess water vapor will condense out. When enough water molecules combine with tiny dust particles in the air, the water molecules themselves will combine with each other and become small water droplets or ice crystals. The water vapor in the air exceeds saturation and condenses into water droplets, which is mainly caused by the temperature drop. This is why it is foggy in autumn and winter morning.

If the ground heat is lost, the temperature drops and the air is quite humid, then when it is cooled to a certain extent, some water vapor in the air will condense out and become many small water droplets suspended in the air layer near the ground to form fog. Both it and clouds are caused by temperature drop, and fog can actually be said to be a cloud near the ground.