How are atmospheric tides formed? Causes of the formation of tides

Tides are caused by the gravitational pull between the Earth, the Moon and the Sun, and the gravitational pull varies from point to point on the Earth, and the closer you are, the higher the sea is pulled. The tides caused by the sun are called solar tides, and the tides caused by the moon are called lunar tides, and tidal forces are also a clean and environmentally friendly energy source.

The tides are due toMoonGravity and the Earth's gravitational pull interact with each other.

Tides are periodic fluctuations in sea water formed by the gravitational pull of the Moon and the Sun. The Moon is attractive to the Earth's seawater, and the distance between the Earth's surface and the Moon is different, and the place facing the Moon is gravitationally strong, and the seawater expands outward. And where the back is to the moon, the sea water is less gravitational and centrifugal force.

As it grows, the sea water expands with its back to the moon under the action of centrifugal force, and high tides also occur.

Therefore, there are two high tides a day.

Tides vary from place to place, and different regions often have different tidal systems, all of which derive their energy from deep-sea tide waves, but have their own unique characteristics.

Citations explained:

Tides are periodic fluctuations in sea water formed by the gravitational pull of the Moon and the Sun. The tides are weighed during the day and the tides at night, which are collectively called "tides". Generally, it rises and falls twice a day, and there are also fluctuations once. The tidal waves of the open sea are traced up the river, which in turn causes the tide to occur in the lower reaches of the river.

Due to the summer calendar. It is the change of the moon phase.

As a basis, it has a major function of reflecting tides and tidal phenomena.

It is the moon that plays a leading role, and the summer calendar, which is based on the changes of the moon phases, is a guide to maritime activities in ancient times. The Moon is attractive to the Earth's seawater, and the distance between the Earth's surface and the Moon is different, and the place facing the Moon is gravitationally strong, and the seawater expands outward. The place with the back to the moon is less gravitational, and the centrifugal force becomes larger, and the sea water expands to the place with the back to the moon under the action of centrifugal force, and the tide will also occur.

The reason for the formation of tides can be attributed to the interaction between gravity and centrifugal force.

The gravitational pull of the Moon and the Sun on the Earth's orbit creates a gravitational tidal force, while the Earth's rotation creates a centrifugal force. The gravitational force causes the sea water to bend in the direction of the moon or the sun, while the centrifugal force causes the sea water to bend in the opposite direction of the earth. The formation of tides is also influenced by factors such as topography and the depth of the sea in the Imperial Palace.

For example, narrow seas such as straits and bays can cause the tides to rise and fall more.

Tides refer to the periodic fluctuations of sea water under the gravitational pull of the Moon and the Sun. In this article, the causes of tides are demolished, including the effects of gravitational and centrifugal forces, topography, and sea depth. At the same time, the characteristics and laws of tides and their impact on human society will also be introduced.

Characteristics and regularity of tides

Tides are distinctly cyclical, usually in daily, monthly, and annual cycles. During synodic time, i.e. when the moon phase is a new moon or a full moon, the tides rise and fall maximumly. At the top and bottom of the wind, i.e. when the moon phase is on the top or bottom wind, the tide rises and falls less.

In addition, tides also have regularities such as flow velocity and duration. For example, at high tide, the flow of seawater is greater and lasts longer; At low tide, the flow of sea water is less and lasts for a shorter period of time.

The impact of tides on human society is extensive and far-reaching. In terms of economy, tidal energy is an important renewable energy source that can be harnessed to generate electricity. In terms of ecology, tides affect the reproduction and distribution of marine organisms, which in turn affects the balance of marine ecosystems.

In terms of environment, tides will affect the morphology and stability of the coastline, which in turn will affect the economic development and ecological environmental protection of human society.

The above content refers to Encyclopedia - Tides.

One of the main causes of tides is actually gravitational attraction, which is a complex physical phenomenon, mainly due to the continuous change of the relative geographical location of the earth, the moon and the sun, and the constant change of the combined force of the earth by the gravitational force of the sun and the moon, as well as the rotation of the earth. The regular movement of tides is manifested in: due to the rotation of the earth, when the sea level is facing the moon, because the sea water is current, the sea water is subject to the gravitational pull of the moon and the sun, it will flow in the direction of gravity and gather and bulge, it will produce high tides, and when the sea level is turned away from the moon, it will produce low tides, and the earth rotates once a day for a day, so the tide rises and falls once a day.

What do ocean tides have to do with the Moon?

One of the most important effects of the Moon on Earth is to cause tides. Due to the gravitational pull of the moon and the relatively small gravitational pull of the sun, the sea level rises and falls alternately twice a day. Suppose that the whole earth is covered by seawater, and the waters of the ground closer to the Moon are pulled by the Moon the most, and the water will gather towards the point facing the Moon; On the other side of the earth, the pull of the moon on the ground is greater than that of the water, so the water area also forms a bump at the farthest point from the moon, so that the earth has two highest water points: high tide and low tide.

Thus, when the Earth completes one complete rotation, two tidal phenomena occur at almost every point on the Earth.

Astronomical significance of tidal phenomena.

Tidal phenomena refer to the periodic movement of sea water under the action of the gravitational force of celestial bodies (mainly the moon and the sun), and it is customary to call the vertical rise and fall of the sea surface tide, and the flow of sea water in the horizontal direction is called tidal current. Generally, the tidal attraction force is greater in the place facing the moon, and the tidal attraction force of the sea water facing away from the moon becomes smaller, and because the centrifugal force becomes larger, the seawater runs to the side facing away from the moon under the action of the centrifugal force, so the tide will also occur.

For objects on the ground farthest from the Moon, the gravitational pull of the Moon on the object here is less than the corresponding inertial force, and their resultant force is in the opposite direction of the Earth's gravitational force on the object here, which also makes the gravitational force of the object significantly smaller. So in the farthest part of the ocean from the moon, there will be high tides at the same time.

Treating the earth and the moon as particles, and saying that the moon moves in a circle around the earth, in fact, both the moon and the earth move in a circle around the common center of mass of the two, but the circumferential orbit of the earth is much smaller. Taking the geocentricity as the non-inertial reference, the gravitational force of the earth's mass point by the lunar mass point is the centripetal force of the earth's mass point moving in a circular motion around the common center of mass, and the inertial force corresponding to this centripetal force is opposite to the centripetal force of equal magnitude. Therefore, the gravitational pull of the mass point of the earth is canceled out by this inertial force of the mass point of the moon.

Since the earth is regarded as a particle, the trajectory and dynamics of objects on the earth can be regarded as exactly the same as that of the earth's particles. In this way, the gravitational pull of the moon and the corresponding inertial force cancel each other out.

In fact, the volume of the earth is very large, the object on the ground closest to the moon, the orbital radius of the circular motion around the common center of mass of the earth and the moon is obviously smaller than the orbital radius of the earth's mass point, and the gravitational force of the moon will be greater than the corresponding inertial force, and these two forces can no longer be canceled, and its resultant force is opposite to the direction of the earth's gravitational force of the object, so that the gravitational force of the object is significantly smaller.

The gravitational force of the Moon and the Sun on the oceans is responsible for the rise and fall of the sea, regardless of the weak role of other planets. From the point of view of physics, the gravitational force is the combined force of the gravitational force of the moon and the corresponding inertia, as well as the gravitational force of the sun and the corresponding inertial force.

The role of the Moon. Considering the Earth and the Moon as particles, the Moon moves in a circle around the Earth, and both the Moon and the Earth move in a circle around the common center of mass of both, and the Earth's circular orbit is much smaller.

The gravitational force of the earth's mass by the lunar mass is the centripetal force of the earth's mass point moving in a circular motion around the common center of mass, and the inertial force corresponding to this centripetal force is opposite to the centripetal force of equal magnitude. The gravitational pull of the Earth's mass is canceled out by the gravitational force of the lunar mass and this inertial force.

The gravitational forces of the Sun and the Moon can also cause "high tides"; When the moon phase is the first and last wind, that is, the eighth and twenty-third hours of the lunar calendar, the solar tidal force and the lunar tidal force cancel each other out of the part of the "small tide", there is a saying in the agricultural proverb that "the first fifteenth day of the first month rises the big tide, and the eighth and twenty-third days of the first month see the beach everywhere".

A general term for the periodic movements and changes that occur in the Earth's lithosphere, hydrosphere, and atmosphere, respectively, due to the action of the gravitational force of the sun and the moon. The elastic-plastic deformation of the solid earth caused by the gravitational force of the sun and the moon is called the solid tide, referred to as the solid tide or the ground tide; The periodic rise, fall, advance and retreat of the sea surface caused by the tidal force of the sun and the moon are called ocean tides, referred to as ocean tides; The periodic changes (such as hours) caused by the gravitational force of various elements of the atmosphere (such as the pressure field, the atmospheric wind field, the earth's magnetic field, etc.) are called atmospheric tides, referred to as air tides. Among them, the atmospheric tide caused by the sun is called solar tide, and the solar tide caused by the moon is called the solar tide.

Because the Moon is closer to the Earth than the Sun, the ratio of the gravitational force of the Moon to the Sun is 11:5, and for the ocean, the solar tide is more significant than the solar tide. The driving force of earth tides, ocean tides and air tides is caused by the different gravitational forces of the sun and the moon on various parts of the earth, and the three affect each other.

The elastic-plastic tidal deformation of the crust at the bottom of the ocean will cause the corresponding tidal tides, that is, there is a geotidal effect on the ocean tides. The migration of seawater mass caused by ocean tides changes the load on the earth's crust and causes the earth's crust to undergo reversible distortions. The air tide is above the ocean tide, and it acts on the sea surface to cause its additional vibrations, which further complicates the change of the ocean tide. As a complete tidal science, the research object should take the earth tide, ocean tide and air tide as a unified whole, but because the phenomenon of ocean tide is very obvious and closely related to people's life, economic activities, transportation, etc., it is customary to understand the word tide in a narrow sense as ocean tide.

How are tides formed? Reveal the natural phenomenon tides, increase knowledge.

Tides are formed by the gravitational influence of the sun and the moon.