The color of the sea isA branch of ocean optics, most of the ocean is blue, but there are places where the ocean is blue-green, green, and even yellow to brown.
This blue color does not come from the water itself, but from the refraction and scattering of sunlight. The water molecules absorb the red wavelength, while the blue wavelength is scattered more efficiently, allowing us to see the blue color. Red light is the most easily absorbed, so it cannot reach very deep places, usually less than 50 meters; In contrast, blue light can penetrate up to 200 meters. Water molecules and very small particles in seawater scatter blue light preferentially over light of other colors, similar to blue light scattering in the sky.
There are several reasons why the water turns black.
One possibility is an increase in organic matter. Organic matter from plant residues, putrefactive organisms, and other biological activities decomposes in seawater, causing the water to turn black.
In addition, large-scale algae blooms can also cause the water to take on a dark green or black color. Pollution is also a factor in the blackening of seawater, such as the discharge of oil, chemicals or waste.
Solving the problem of blackening seawater requires a comprehensive treatment.
Monitoring and controlling the release of organic matter is one of the key. Strict control of wastewater discharge, reduction of pollutants and the release of organic waste are important steps in the purification of seawater. At the same time, promoting sustainable use of marine resources and avoiding overfishing and pollution will help maintain the balance of the marine ecosystem.
In addition to managing the source of pollution, there are concrete actions that can be taken to improve the quality of the seawater. For example, measures such as cleaning up marine litter, large-scale clean-up operations, and promoting marine protected areas can all help to clean up seawater and maintain the health of marine ecosystems.
The blackening of the sea is not a temporary problem, but the result of long-term effects on the ecosystem. By controlling pollution sources, enhancing protection, and taking positive action, we can improve the quality of our seawaters, protect marine ecosystems, and create a better marine environment for the future.
The darkening of seawater can have a variety of causes, from an increase in organic matter to pollution, which can lead to this change. But by controlling pollution sources, reducing organic waste emissions, and taking proactive action, we can improve the quality of our seawaters, maintain the ecological balance of our oceans, and make our oceans clearer and healthier.