What does cyclone have to do with high or low temperatures, and why?

A depression is what meteorologists call a cyclone. In the Northern Hemisphere, low-pressure systems rotate counterclockwise around the center and are generally divided into three categories according to their thermal properties. Namely, extratropical cyclones, subtropical cyclones, and tropical cyclones.

Extratropical cyclones mainly occur in the middle and high latitudes north of the subtropical high, tropical cyclones occur in the tropical oceanic atmosphere of the same nature, and subtropical cyclones are cold low pressure systems active in low latitudes, which mainly occur in late winter and early spring.

The generation of a cyclone is a weather phenomenon caused by air temperature. When the temperature on the ground is high, the air flow rises, the ground pressure decreases, and the relative air pressure in the sky becomes high, and the air flow in the air rotates to the ground to the left (the Northern Hemisphere rotates to the left due to gravity), and there is a counterclockwise rotation. The direct cause of cyclones is the effect of high and low temperatures.

Cyclone systems and low-pressure systems are different descriptions of the same weather system, so cyclone systems are both low-pressure systems!

So you can ask a question like this: What is the relationship between low pressure and high or low temperature, and why?

There are two reasons for the formation of air pressure:

1. Thermal causes: equatorial low pressure, polar high pressure.

2. Dynamic reasons such as: subtropical high pressure, subpolar low pressure belt.

When the temperature near the ground is high, the air expands and rises due to heating, the density of the air near the ground decreases, and the air pressure becomes lower, forming low pressure!

But where the temperature is high, low pressure does not necessarily form!

For example, near 30 degrees north and south latitude, although the temperature is very high, the formation of high pressure!

When the temperature is high, the air flow rises, the density of the air on the ground decreases, and the air pressure becomes lower, forming a low pressure.

When the temperature is low, the air drops, the density of the air on the ground increases, and the air pressure increases, forming a high pressure.

Here's a little trick:

High temperature – low pressure.

Low temperatures – high pressure.

Of course, this trick is only satisfied with coping with exams, and there are still many problems to be taken into account in professional research!

High School Geography -

High temperature – low air pressure (cyclone).

Low temperature – high air pressure (anticyclone).

A cyclone is just another name for a pressure mass.

The density is proportional to the pressure rock, and the higher the density, the higher the air pressure, but it is important to note that the air pressure can only be compared at the same height.

The change of air temperature will cause the change of density, the air temperature is high, the air flow expansion increases, the density of the air near the ground decreases, the air pressure decreases, the density of the air at high altitude increases the nuclear combustion, and the air pressure increases. When the air temperature is low, the air flow shrinks and sinks, the density of the air near the surface increases, the air pressure increases, and the density of the air at high altitude decreases, and the air pressure decreases.

A cyclone is a low-pressure center, the central air pressure is low, the surrounding air pressure is high, the surrounding air flow to the center, the central air flow converges and rises, the temperature of the air changes to the jujube virtual current in the rising process, the water vapor is easy to condense, and the clouds cause rain, so the control area is more cloudy and rainy weather.

A tropical cyclone is an intense weather system that occurs in the tropical oceans, and like a vortex moving forward in a flowing river, it rotates rapidly around its center while moving forward with the surrounding atmosphere. In the Northern Hemisphere, the air flow rotates counterclockwise around the center, and in the Southern Hemisphere it is reversed. The closer you get to the centre of the tropical cyclone, the lower the pressure and the stronger the winds.

However, when a strong tropical cyclone develops, such as a typhoon, the center of the cyclone is an area of calm and clear skies, known as the eye of the typhoon. In meteorology, only tropical cyclones with a certain wind speed are given names such as "typhoon" and "hurricane".

An extratropical cyclone is a type of cyclone that is active in the mid-latitudes of the temperate zone, also known as:"Temperate low air pressure"or"Frontal cyclones"。Extratropical cyclones are cold-hearted systems that occur along with fronts and are generally larger than tropical cyclones, reaching hundreds or even thousands of kilometres. Extratropical cyclones are approximately elliptical air vortices that occur in the middle and high latitudes with a central pressure lower than the surrounding area and have the properties of a cold center, and are one of the important weather systems affecting a wide range of weather changes.

The main differences are: 1. The location and area of occurrence are different. Tropical cyclones are high-temperature sea surfaces in the western Pacific and South China Seas, and extratropical cyclones occur in the middle and high latitudes, while the central pressure is lower than the approximately elliptical air vortices around them.

2. The reasons for the formation are also different. The tropical sea surface is formed by the further development of convective movement due to the increase in temperature of the direct sunlight and the release of a large amount of latent heat by water vapor. Extratropical cyclones are formed by the movement of fronts, with a warm front in the front and a cold front in the back, and the south side of the fluctuation at the junction of the two is the warm zone.

Extratropical cyclones include southern cyclones and northern cyclones.

Weather characteristics under cyclone control: cyclone transit, low pressure control, rainy weather, typhoon disaster; Storms, tropical cyclones.

Reason: The ground is hot and cold, and the ground is hot in a certain place, so the air expansion density becomes smaller, so the air flow rises, and low pressure is formed near the ground, and the relative air pressure around is high, so the air flow flows from high pressure to low pressure, that is, from the surrounding flow to the center (the center is rising) to form a cyclone.

2.Weather characteristics under anticyclone control: anticyclone transit, high pressure control, sunny weather, high and cool autumn, cold wave in winter, drought in summer.

The reason is that when the ground is cold, the air expands and shrinks in density, forming high and low pressure near the ground, and the relative air pressure around is low, so the air flow flows from high pressure to low pressure, that is, from the center to the surrounding (the center is sinking and rising) to form an anticyclone.

Low pressure or cyclone, high pressure or anticyclone, are different descriptions of the same weather system. Cyclones and anticyclones are descriptions of the airflow conditions of a weather system; Low pressure, high pressure is a description of the state of air pressure in a weather system. Because of the obvious differences in pressure and flow conditions between cyclones and anticyclones, the weather conditions in the areas under their control are also different.

A cyclone is a large vortex in the northern (southern) hemisphere in which the horizontal air flow rotates counterclockwise. At the same altitude, the pressure at the center of the cyclone is lower than around it, also known as low pressure. It appears on the contour map as a low pressure area surrounded by a closed isobar, and on the isobaric map as a low area surrounded by a closed contour line.

Cyclones are approximately circular or oval in shape and vary greatly in size. The horizontal scale of small cyclones is a few hundred kilometers, and the largest ones can reach three or four thousand kilometers, which is a weather system on a weather scale. Cyclones, in which the weather often changes drastically, are the weather systems that people are most concerned about and the first to study.

An anticyclone is a horizontal air vortex with a central pressure higher than the surrounding air pressure, which is also the high pressure in the barometric system. In the Northern Hemisphere anticyclone, the horizontal airflow in the lower levels diverges outward in a clockwise direction, while the Southern Hemisphere anticyclone diverges outward in a counterclockwise direction. Anticyclones have a larger horizontal scale than cyclones, such as the Mongolian-Siberian high in winter, which occupies an area of the Eurasian continent1 4.

The central pressure value of each anticyclone is generally about 1020 1060hpa, and the highest pressure is recorded. The wind speed in the anticyclone is small, and the maximum wind speed on the ground is only 20 30 m s, and the wind in the central area is weak. Under anticyclone control, mostly sunny weather.

Cyclone-controlled weather characteristics: rainy weather formed;

Causes: The rising airflow in the cyclone center and the lower temperature are conducive to cloud-forming rain.

Weather characteristics under anticyclonic control: sunny weather;

The reason is that the central airflow of the anticyclone is sinking and the temperature is rising, which is not conducive to cloud-forming rain.

Because I don't know your situation, the explanation is too detailed, involving some physical principles, I hope to read it patiently. Follow-up questions.

1. Cyclone: the ground is hot and cold, and the ground is hot in a certain place, the air is heated and the expansion density becomes smaller, so the airflow rises, and low pressure is formed near the ground, and the relative air pressure around is high, so the airflow flows from high pressure to low pressure, that is, it flows from the surrounding to the center (the center is rising) to form a cyclone.

Because the ground temperature is higher than that of the upper altitude, the temperature gradually decreases during the rise of the air, and the water vapor is easy to be supersaturated (because the temperature is low, the solubility of the water vapor in the air decreases), so it is easy to condense clouds and cause rain. Therefore, cyclones are prone to cloudy and rainy days.

Ground heat – low pressure on the ground – air convergence rising – cyclone (low pressure system) – rainy day.

2. Anticyclone: vice versa.

When a ground is cold, the air expands and shrinks in density, forming high and low pressure near the ground, and the relative air pressure around is low, so the air flow flows from high pressure to low pressure, that is, from the center to the surrounding areas (the center is sinking and rising) to form an anticyclone.

Because the ground temperature is at high altitude, the temperature gradually rises during the sinking of the air, and the water vapor is not easy to supersaturate (because the temperature is high, the solubility of the water vapor in the air increases), so it is not easy to condense clouds and cause rain. Hence the anticyclone is mostly sunny.

Cold on the ground – high pressure on the ground – divergent air dispersion and sinking – anticyclone (high-pressure system) – sunny day.

In our high school geography study, we cover a wide range of topics, but when we study and review, we can connect the various parts of the knowledge, so that the geography knowledge will not seem so disorganized. Below, I have collected and sorted out for you "How are extratropical cyclones formed? Let's start thinking from this part of the knowledge points together.

An extratropical cyclone, also known as an "extratropical depression" or "frontal cyclone", occurs in the middle and high latitudes with a central pressure lower than the surrounding area, and is an approximately elliptical air vortex. Extratropical cyclones are one of the important weather systems that affect a wide range of weather changes, with an average diameter of 1,000 km, small ones of several hundred km, and large ones of up to 3,000 km or more.

Extratropical cyclones occur at the intersection of cold polar air and warm tropical air and have a frontal structure. A well-developed extratropical cyclone has a structure of the lowest pressure in the center, with a warm front extending from the center to the front and a cold front to the rear, with warm air between the cold and warm fronts and cold air to the north.

The warm air rises in a spiral on the front, and the cold air sinks in a fan shape under the front. The entire life history of an extratropical cyclone from its formation, development to demise is generally 2?6 days.

On the same front, 2?s are sometimes formed in successionFive extratropical cyclones, moving sequentially from west to east, are called cyclone families.

Extratropical cyclones have an important impact on the weather changes in the middle and high latitudes, and the corresponding weather patterns are as follows: the cyclone is preceded by a wide warm frontal cloud system and the accompanying continuous precipitation weather; Behind the cyclone is a relatively narrow cold front cloud system and precipitation weather; If the water vapor in the warm air mass is sufficient and unstable, stratus clouds, stratocumulus clouds, and drizzle may occur. If the air mass is dry, only a few thin clouds can be generated, and there is no precipitation.

A cyclone is a weather system that produces weather phenomena such as widespread precipitation and strong winds, accompanied by heavy rain or strong convective weather, and sometimes the maximum wind force near the ground can reach more than 10. It is not only determined by the structure of the cyclone temperature and pressure field, but also related to the stability of the air, water vapor conditions, topography and development stage, and is an important weather system in temperate regions.

The above is the article "How are extratropical cyclones formed?" I believe that after mastering this part of the knowledge points, our knowledge reserve will be more perfect, so as to help us solve more geographical problems.