At what time will the fog in Dongjiang Lake appear?

The fog in Xiaodongjiang River looks like before sunrise and one hour after sunset from April to October every year. The principle of fog formation is the temperature difference between water and atmosphere. Xiaodongjiang River is known as the Little Glacier, and its water comes from Dongjiang Lake. The water flows out from the bottom of the dam (more than 100 meters away), and the water temperature ranges from 12 to 17 degrees all year round. Dongjiang Lake is known to have fog in the Dongjiang River, but the fog will occur after the rain, especially from April to October, especially the fog in the mountains, which is very beautiful.

Expansion:

1. When the relative humidity reaches 100% when there is sufficient water vapor, breeze and stable atmosphere, the water vapor in the air will condense into fine water droplets suspended in the air. In the air, visibility at ground level is reduced, a weather phenomenon called fog. Fog occurs more often in spring from February to April. Whenever the visibility is lower than 1 km due to the condensation of suspended water vapor in the atmosphere, meteorology calls this weather phenomenon fog. Conditions for fog formation: First, cooling, second, humidification to increase water vapor content. Types of fog include radiation fog, advection fog, mixed fog, evaporative fog, and smog.

2. Causes

When the water vapor the air holds reaches the maximum, it reaches saturation. The higher the temperature of the air, the more water vapor the air can hold. When the temperature is 4°C, 1 cubic meter of air can hold up to 6.36 grams of water vapor; when the temperature is 20°C, the maximum amount of water vapor that can be contained in 1 cubic meter of air is 17.30 grams. If the air contains more water vapor than the saturated amount of water vapor at a certain temperature, the excess water vapor will condense out. When enough water molecules combine with the tiny dust particles in the air, the water molecules themselves will also interact with each other. When bonded, they become small water droplets or ice crystals. The water vapor in the air exceeds the saturation level and condenses into water droplets. This is mainly caused by the drop in temperature. This is also the reason why mornings in autumn and winter are foggy.

If the ground loses heat, the temperature drops, and the air is quite humid, then when it cools to a certain level, part of the water vapor in the air will condense out and turn into many small water droplets suspended near the ground. In the air layer, fog is formed. Both it and clouds are caused by a drop in temperature, and fog can actually be said to be clouds close to the ground.