What are the main factors affecting the dissolved oxygen content in water

The main factors affecting the dissolved oxygen content in water are mainly the influence of light intensity and air pressure. 1. Dissolved oxygen is affected by light: the oxygen in water mainly comes from the photosynthetic conversion of aquatic organisms, followed by the dissolved oxygen in the air. Sudden changes in weather often lead to sudden changes in temperature, light, and air pressure. As the friend above said, the water temperature is more stable than the air temperature, so the sudden change in temperature is not the main reason for the change of dissolved oxygen in water. However, sudden changes in light will seriously affect the photosynthetic conversion process of aquatic organisms, resulting in a decrease in oxygen production. 2. Dissolved oxygen is affected by air pressure: the reduction of air pressure will reduce the solubility of oxygen in water body, resulting in the lack of oxygen in water body. In the case of low air pressure, pollutants at the bottom of the water body can often be seen, which is the so-called 'flooding pond'."(The 'flooding pond' phenomenon also illustrates the influence of air pressure on the water body from one side). The result of the 'flooding pond' causes the aerobic bacteria inhibited by the lack of oxygen at the bottom of the water to regain the opportunity to obtain oxygen, thereby rapidly depleting the water body dissolved oxygen. Low ambient air pressure also has a negative effect on the oxygen-dissolving capacity of farmed animals, resulting in a decrease in the oxygen-carrying capacity of the blood, so the animals need to breathe more to increase their oxygen intake.