Why is the sea blue? 20 points

People often like to use blue to describe the ocean. In fact, the color of seawater ranges from dark blue to green, from yellow to reddish brown, and even white and black, not just blue.

It turns out that seawater, like ordinary water, is colorless and transparent, and the color of the ocean is determined by the optical properties of seawater, the suspended solids contained in seawater, the depth of seawater, the characteristics of clouds and other factors. As we all know, sunlight is composed of seven colors: red, orange, yellow, green, cyan, blue and purple. The wavelengths of these seven colors are different. From red light to purple light, the wavelength gradually becomes shorter. Long wave has the strongest penetration ability and is easily absorbed by water molecules, while short wave has a weak penetration ability and is prone to reflection and scattering. The degree of absorption, reflection and scattering of light with different wavelengths by seawater is also different. Red light, orange light and yellow light with longer light waves are injected into seawater and gradually absorbed with the increase of ocean depth. Generally speaking, in the ocean where the water depth exceeds 100 meters, most of these three wavelengths can be absorbed by seawater, and the temperature of seawater can rise. However, blue light and purple light with shorter wavelength will have strong scattering and reflection when they meet pure seawater molecules, so the ocean people see will appear blue or dark blue. Due to the increase of suspended solids, the coastal seawater has larger particles, weak absorption of green light and strong scattering, mostly light blue or green.

Violet light has the shortest wavelength and the strongest reflection. Why is the sea not purple? Scientific experiments have proved that human eyes are biased to some extent. People's eyes are very insensitive to the purple light reflected by seawater, so they turn a blind eye. On the contrary, human eyes are sensitive to blue and green light.

Most of the ocean is blue. If there are too many suspended substances in seawater or other reasons, the color of the ocean is no longer blue. For example, the Yellow Sea in China was the mouth of the ancient Yellow River, and a large amount of sediment carried by the Yellow River flowed into the sea, which made the blue sea water "yellow". Although the Yellow River is now pouring into the Bohai Sea, the northern part of the Yellow Sea is connected with the Bohai Sea through the Bohai Strait, and it has to bear the river water injected by the Huaihe River and Guanhe River, so the sea surface is still pale yellow.

In the northwest of the Indian Ocean, the Red Sea between Asia and Africa has the highest water temperature in the world. A reddish-brown seaweed grows in the sea. Because this kind of algae grows vigorously all year round, it dyes the sea surface red, so the Red Sea is named.

In the Gulf of California in the northeast of the Pacific Ocean, there are blood-red algae communities in the south and a lot of red soil brought by the rainy season of the Colorado River in the north. The seawater is reddish brown, which is called Zhu Hai.

The White Sea is the marginal sea of the Arctic Ocean, which goes deep into the northwest inland of Russia, and the Arctic Circle passes through the White Sea. White sea is named "White Sea" because of its high latitude, cold climate, boundless ice and snow and low organic matter content. The seawater is white.

Fresh water such as Don River, Dnieper River and Doe River is injected into the surface of the Black Sea with low density. The deep layer of the Black Sea is high salt water from the Mediterranean Sea, with high density. Density thermocline is formed between the upper and lower seawater, which seriously hinders the water exchange between the upper and lower water layers. The Black Sea exchanges water with the Mediterranean Sea through the Bosporus Strait and the Da Daniil Strait. Because the strait is narrow and shallow, it greatly limits the water exchange between the Black Sea and the Mediterranean Sea. There is no oxygen in the depths of the Black Sea, and the sewage and corpses secreted by organisms in the upper seawater sink into the depths to rot and stink, and a large amount of sludge and turbid water make the ocean dark. In addition, the Black Sea region is often rainy and stormy, which adds a black feeling.

Red tides can also make the color of seawater abnormal. Red tide is a phenomenon that plankton suddenly multiply and gather together in regional waters. The colors of red tide are varied, mainly depending on what kind of marine plankton causes it. The red tide caused by noctiluca is pink or brick red, some dinoflagellates are green or brown, and some diatoms are brown or reddish brown.

In addition, because the sun sometimes disappears in the clouds and sometimes shines through the clouds, the color of the ocean changes accordingly. The color of the ocean also depends on the height of the sun from the horizon.

Brainstorm: Why is the sea blue?

Because there are fish in the sea, and when the fish spit bubbles, the sound is "blue" and "blue", hehe ~

Do you know why the sea is blue?

Do you know why the sea is blue? Answer: Because there are fish. Why are some fish blue? Nailing a fish will spit bubbles! Why is the fish spitting bubbles blue? Because when fish spit bubbles, there is a voice, "blue blue. . .

Why is the sea blue? This is related to cold jokes.

Because there are fish in the sea! Why? Because fish can spit bubbles! Why? Because the bubbles that fish spit are blue, blue!

Why is the sea blue? Brainstorm.

Because there are fish in the sea.

Fish spit bubbles.

Then blue, blue, blue. ...

Why is the sea blue?

The color of seawater is mainly caused by the optical properties of seawater, that is, the absorption, reflection and scattering of solar rays by seawater. We know that sunlight is composed of seven colors: red, orange, yellow, green, cyan, blue and purple. The wavelengths of seven colors are different. From red to purple, the wavelengths are getting shorter and shorter. Among them, red light, orange light and yellow light with longer wavelength have stronger penetration ability and are most easily absorbed by water molecules. Blue light and purple light with short wavelength have weak penetration ability, and are most easily scattered and reflected when encountering pure seawater. Because people's eyes are not sensitive to purple light, they often turn a blind eye and are sensitive to blue light. Therefore, the ocean we see is blue or dark blue. If you put a bucket of seawater in a bowl, the seawater is as colorless and transparent as ordinary water. In fact, the sea looks not all blue, but red, yellow, white, black and so on, colorful. Because the color of seawater is not only affected by the above factors, but also by suspended solids, seawater depth, clouds and other factors. The Yellow Sea in China, for example, looks yellow-green, because a lot of sediment carried by the ancient Yellow River "polluted" the seawater. Although the Yellow River is diverted to the Bohai Sea, there is a wide Bohai Strait in the northern part of the Yellow Sea and rivers such as the Huaihe River inject it, so the sea surface is still pale yellow.

In the Red Sea between Asia and Africa, because of the high water temperature, an algae grows in the sea, which turns reddish brown after a large number of deaths and dyes the seawater red. The Red Sea got its name from this.

In the Black Sea, due to the injection of rivers such as Danube River, Don River and Dnieper River, the surface density is very low, and the deep layer is influenced by the high salinity seawater in the Mediterranean, so the density is very high. In this way, the upper density is small, the lower density is large, and the difference is large, so it is difficult to exchange the upper and lower water bodies. There is only a narrow and shallow Turkish Strait between the Black Sea and the Mediterranean Sea, which makes it difficult to exchange a lot of seawater between them. In this way, the lower seawater of the Black Sea has been in an anoxic environment for a long time, and the sewage secreted by creatures and various animals and plants in the upper seawater sinks into the depths to rot and stink after death, and a large amount of sludge turns the seawater black.

The Arctic Ocean goes deep into the White Sea in northern Russia. Because of its high latitude, cold all year round, boundless ice and snow and low organic matter content, the seawater is white, hence the name "White Sea".

Cold joke, why is the sea blue?

Because there is water in the sea, there are fish in the water, and the fish spit bubbles blue.

Why are the sky and the sea blue?

Why is the sea blue?

Sunlight consists of red, orange, yellow, green, cyan,

Seven colors: light, blue and purple. Dangtai

Sunlight shines on the sea, red and orange.

Some light with longer wavelength can bypass all obstacles.

Obstacles, move forward. They are making progress.

It is constantly absorbed by seawater and marine life.

Take it. Blue light and violet light have shorter wavelengths.

Light, although some of it is sea and sea.

Algae are absorbed, but most of them encounter seawater.

Obstacles are scattered around, or

The audience is just reflected back. What do we see?

It is this part that is scattered or reflected.

Light. The deeper the sea water is, the blue color is scattered and reflected.

The stronger the light, the more the sea always looks.

Blue, blue.

Why is the sky blue?

The scattering of sunlight by the atmosphere makes us

The sky you see is blue. Earth surface quilt

Surrounded by the atmosphere, when sunlight enters the atmosphere,

Air molecules and particles (dust, water droplets, ice

Crystal, etc. ) will scatter sunlight around. also

Sunlight consists of red, transparent, yellow, green, blue,

Indigo and purple are composed of seven kinds of light, of which red light has the longest wavelength.

Long violet light has the shortest wavelength. Longer wavelength

Isochromatic light, such as red light, has the greatest transmittance.

Through the particles in the atmosphere and shoot to the ground. Wave a hand

Long and short blue, indigo, purple and other colors of light, very tolerant.

Easily scattered by particles in the atmosphere. In short wave

The blue light in this section has the largest energy, scattering light.

The waves are also the most, so the sky we see is

Show blue.

Why is the sea blue?

People often like to use blue to describe the ocean. In fact, the color of seawater ranges from dark blue to green, from yellow to reddish brown, and even white and black, not just blue.

It turns out that seawater, like ordinary water, is colorless and transparent, and the color of the ocean is determined by the optical properties of seawater, the suspended solids contained in seawater, the depth of seawater, the characteristics of clouds and other factors. As we all know, sunlight is composed of seven colors: red, orange, yellow, green, cyan, blue and purple. The wavelengths of these seven colors are different. From red light to purple light, the wavelength gradually becomes shorter. Long wave has the strongest penetration ability and is easily absorbed by water molecules, while short wave has a weak penetration ability and is prone to reflection and scattering. The degree of absorption, reflection and scattering of light with different wavelengths by seawater is also different. Red light, orange light and yellow light with longer light waves are injected into seawater and gradually absorbed with the increase of ocean depth. Generally speaking, in the ocean where the water depth exceeds 100 meters, most of these three wavelengths can be absorbed by seawater, and the temperature of seawater can rise. However, blue light and purple light with shorter wavelength will have strong scattering and reflection when they meet pure seawater molecules, so the ocean people see will appear blue or dark blue. Due to the increase of suspended solids, the coastal seawater has larger particles, weak absorption of green light and strong scattering, mostly light blue or green.

Why is the ocean blue?

People often like to use blue to describe the ocean. In fact, the color of seawater ranges from dark blue to green, from yellow to reddish brown, and even white and black, not just blue.

It turns out that seawater, like ordinary water, is colorless and transparent, and the color of the ocean is determined by the optical properties of seawater, the suspended solids contained in seawater, the depth of seawater, the characteristics of clouds and other factors. As we all know, sunlight is composed of seven colors: red, orange, yellow, green, cyan, blue and purple. The wavelengths of these seven colors are different. From red light to purple light, the wavelength gradually becomes shorter. Long wave has the strongest penetration ability and is easily absorbed by water molecules, while short wave has a weak penetration ability and is prone to reflection and scattering. The degree of absorption, reflection and scattering of light with different wavelengths by seawater is also different. Red light, orange light and yellow light with longer light waves are injected into seawater and gradually absorbed with the increase of ocean depth. Generally speaking, in the ocean where the water depth exceeds 100 meters, most of these three wavelengths can be absorbed by seawater, and the temperature of seawater can rise. However, blue light and purple light with shorter wavelength will have strong scattering and reflection when encountering relatively pure seawater molecules, so the ocean people see will appear blue or dark blue. Due to the increase of suspended solids, the coastal seawater has larger particles, weak absorption of green light and strong scattering, mostly light blue or green.

Violet light has the shortest wavelength and the strongest reflection. Why is the sea not purple? Scientific experiments have proved that human eyes are biased to some extent. People's eyes are very insensitive to the purple light reflected by seawater, so they turn a blind eye. On the contrary, human eyes are sensitive to blue and green light.

Most of the ocean is blue. If there are too many suspended substances in seawater or other reasons, the color of the ocean is no longer blue. For example, the Yellow Sea in China was the mouth of the ancient Yellow River, and a large amount of sediment carried by the Yellow River flowed into the sea, which made the blue sea water "yellow". Although the Yellow River is now pouring into the Bohai Sea, the northern part of the Yellow Sea is connected with the Bohai Sea through the Bohai Strait, and it has to bear the river water injected by the Huaihe River and Guanhe River, so the sea surface is still pale yellow.

In the northwest of the Indian Ocean, the Red Sea between Asia and Africa has the highest water temperature in the world. A reddish-brown seaweed grows in the sea. Because this kind of algae grows vigorously all year round, it dyes the sea surface red, so the Red Sea is named.

In the Gulf of California in the northeast of the Pacific Ocean, there are blood-red algae communities in the south and a lot of red soil brought by the rainy season of the Colorado River in the north. The seawater is reddish brown, which is called Zhu Hai.

The White Sea is the marginal sea of the Arctic Ocean, which goes deep into the northwest inland of Russia, and the Arctic Circle passes through the White Sea. White sea is named "White Sea" because of its high latitude, cold climate, boundless ice and snow and low organic matter content. The seawater is white.

Fresh water such as Don River, Dnieper River and Doe River is injected into the surface of the Black Sea with low density. The deep layer of the Black Sea is high salt water from the Mediterranean Sea, with high density. Density thermocline is formed between the upper and lower seawater, which seriously hinders the water exchange between the upper and lower water layers. The Black Sea exchanges water with the Mediterranean Sea through the Bosporus Strait and the Da Daniil Strait. Because the strait is narrow and shallow, it greatly limits the water exchange between the Black Sea and the Mediterranean Sea. There is no oxygen in the depths of the Black Sea, and the sewage and corpses secreted by organisms in the upper seawater sink into the depths to rot and stink, and a large amount of sludge and turbid water make the ocean dark. In addition, the Black Sea region is often rainy and stormy, which adds a black feeling.

Red tides can also make the color of seawater abnormal. Red tide is a phenomenon that plankton suddenly multiply and gather together in regional waters. The colors of red tide are varied, mainly depending on what kind of marine plankton causes it. The red tide caused by noctiluca is pink or brick red, some dinoflagellates are green or brown, and some diatoms are brown or reddish brown.

In addition, because the sun sometimes disappears in the clouds and sometimes shines through the clouds, the color of the ocean changes accordingly. The color of the ocean also depends on the height of the sun from the horizon.

—— Excerpted from Interesting Things about the World Ocean, edited by Wang et al., New Times Publishing House, 2000.