Anticyclone and Cold Wave High School Geography, Is Cold Wave an Anticyclone

According to the structure of the anticyclone, it is divided into cold anticyclone (cold high pressure) and warm anticyclone (warm high pressure).

Extratropical Cold Anticyclone and Cold Wave In winter, the surface of the continent is strongly radiatively cooled, and the air gathers on the continent to form a cold high pressure. Anticyclone.

The Mongolian-Siberian high in East Asia is the most powerful cold high in the world, and its eastward movement is characterized by large-scale cold air activity, resulting in the formation of strong winds and cooling weather in the region. At the intersection of the cold air front and the warm air, cloudy and rainy weather is formed, and the main body of cold and high pressure arrives in the area to maintain clear weather. **The Bureau of Meteorology has stipulated that if the cold air invades during the cold and high pressure activities, the temperature will be cooled by more than 10 in 24 hours, and the minimum temperature will be below 5, accompanied by a northerly wind of about 6, as the standard for issuing cold wave warnings.

There are an average of 3 4 nationwide cold spells per year in the winter half of the year in China. March and April are the most frequent months of the year, followed by November. The nationwide cold spell generally begins in late September and does not end until May of the following year.

Each cold wave takes about 3 to 4 days from the outbreak to the end (moving out of China). Anticyclone.

It is unlikely that the cold air activity in summer will meet the criteria for a cold wave, but there will be a 24-hour cooling10. In summer, the cold air moves to the southeast, which forces the warm air mass to rise, causing water vapor to rise and condense into clouds to cause rain, which is an important cause of precipitation in eastern China.

An anticyclone is high pressure, and when it's high pressure, the central airflow goes down, so the water vapor doesn't rise, and it doesn't rain.

Naturally, it was a dry and sunny day.

The second question may be a bit problematic.

You're probably talking about a frontal cyclone, which is a combination of a cyclone and a front.

If you have to follow what you say, it can only be that the high pressure is formed in autumn and autumn, then a cold wave is also likely to occur at this time.

A cold wave is not an anticyclone. The cold wave is a kind of disastrous weather in winter, and the masses are accustomed to calling the cold wave a cold wave. The so-called cold wave refers to the cold air from high latitudes, which rapidly strengthens and invades the middle and low latitudes under specific weather conditions, causing severe cooling, strong winds, rain and snow in the areas along the way.

When this kind of cold air invades southward and reaches a certain standard, it is called a cold wave.

Anticyclone refers to the horizontal air vortex in which the central pressure is higher than the surrounding air pressure, and is also the high pressure in the air pressure 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.

1. A cyclone refers to a large vortex in which the horizontal airflow in the atmosphere rotates counterversely or clockwise. At the same altitude, the pressure at the center of the cyclone is lower than around it, also known as low pressure. It appears as a low pressure zone surrounded by a closed isobar on the isometric map, and a low value zone surrounded by a closed isoclad high line on the isobar map.

Cyclones are approximately circular or oval in shape and vary greatly in size;

2. Anticyclone refers to the horizontal air vortex where the central pressure is higher than the surrounding air pressure, and it is also the high pressure in the air pressure system. In the Northern Hemisphere anticyclone, the horizontal airflow in the lower levels diverges outward in a clockwise direction, while the anticyclone in the Southern Hemisphere diverges outward in a counterclockwise direction.

1. Move.

The direction is different. A cold front is a front in which a cold air mass actively moves towards a warm air mass, and a warm front refers to a front in which a warm air mass actively moves towards a cold air mass. A cyclone refers to a large vortex in the northern (southern) hemisphere, in which the horizontal air flow rotates counterclockwise, and an anticyclone refers to a horizontal air vortex with a central pressure higher than the surrounding pressure.

2. The weather phenomenon is different after transit.

When the cold front is transited, it is prone to weather phenomena such as cloudy, rainy, windy, and cooling. After the passage of the warm front, the warm air mass occupies the position of the original cold air mass, so the temperature rises, the air pressure drops, and the weather becomes clearer.

3. The speed is different from the horizontal scale.

The horizontal scale of cyclones is generally 1000km, with large ones reaching 2000-3000km and small ones only 200-300km. The horizontal scale of an anticyclone is generally much larger than that of a cyclone, and can reach thousands of kilometers when it is strong. Cold fronts move faster, while warm fronts move slower than cold fronts.

Surface cyclones are generally associated with frontal cyclones, which are common weather systems in the middle and high latitudes of northern China.

In a frontal weather system, the warm air mass above the front, regardless of whether it is a cold front or a warm front, will be lifted along the front, and a weather with clouds and precipitation will be formed, that is, frontal rain. When the two systems combine to form a frontal cyclone, which will radiate into a stronger updraft, the weather will change more drastically, often producing clouds, rain, and even heavy rain, thunderstorms, and windy weather.

1. The slope (that is, the angle between the front line and the ground) is different.

Because the cold air mass moves fast, the cold air mass in the cold front pushes the front to move rapidly, and the warm air mass rises rapidly, so the cold front slope is large.

In the warm front, the warm air mass slowly climbs above the cold air mass and pushes the front to move slowly, so the slope of the warm front is small.

2. The location and scope of precipitation are different.

Cold front precipitation mainly occurs behind and near the front, and the rain area is narrow.

The precipitation of the warm front is all in front of the front, and the rain area is wide.

3. The time and intensity of precipitation are also different.

The precipitation time of the cold front is short and the intensity is high.

The precipitation of the warm front is long and the intensity is small.

4. The weather changes differently.

When a cold front crosses, weather phenomena such as cloudy, windy, rainy (snow), and cooling often occur. After the cold front passes, the cold air mass occupies the position of the original warm air mass, the temperature drops, the humidity drops, the air pressure rises, and the weather becomes clearer.

When a warm front passes, clouds thicken and cover the sky, often forming continuous precipitation (i.e., uninterrupted precipitation that lasts for a long period of time). After the passage of the warm front, the weather is controlled by the warm air mass, the temperature rises, the humidity increases, the air pressure decreases, and the weather becomes clearer.

Difference Between Cyclone and Anticyclone:

First, the direction is different.

Cyclone: A large vortex in which the horizontal air flow in the atmosphere rotates counterclockwise, radiating from the periphery to the center, counterclockwise in the northern hemisphere and clockwise in the southern hemisphere.

Anticyclone: In the Northern Hemisphere, the air flow in the anticyclonic region rotates clockwise from the center outward, and counterclockwise in the Southern Hemisphere.

Second, the pressure distribution is different.

At the same altitude, the pressure at the center of the cyclone is lower than around it, also known as low pressure. Cyclones are approximately circular or oval in shape and vary greatly in size;

Anticyclone is a high-pressure area where the isobars are closed and the pressure value decreases from the center to the outside, so it is also called high pressure.

3. The weather is different.

The vertical airflow of the cyclone is upward, and it is mostly rainy and cloudy. Typhoons that affect the southeast coastal areas of China in summer and autumn are a type of cyclone. Cyclones, in which the weather often changes drastically, are the weather systems that people are most concerned about and the first to study.

The anticyclone's near-surface airflow radiates horizontally from the center to the periphery, and the vertical air replenishes from the top. The temperature of the air rises during the sinking process, and the water vapor is not easy to condense, so the area controlled by the anticyclone is mostly sunny.

Cold and warm front:

1.time, the transit speed of the cold front is fast and the time is short (here refers to the transit time); Warm air on the contrary.

2.Precipitation, precipitation from a cold front is after the front, and precipitation from a warm front is before the front. (You can take a look at the transit map of the cold and warm fronts in the book, the cold front has a low temperature and heavy air, and when it crosses close to the ground, the warm air is forced to lift and form precipitation behind the front; Warm front is the opposite).

3.After the passage of the cold front, the temperature decreases, the air pressure rises, and the weather becomes clearer. The temperature of the warm front increases, the air pressure decreases, and the weather turns cloudy and rainy.

4.Cold fronts move from high latitudes to low latitudes, while warm fronts move in the opposite direction.

Cyclones vs Anticyclones:

1.The center of the cyclone at low altitude is low pressure, and the center of the anticyclone is high pressure (just name a person here--- Van Gogh. ）

2.Cyclones are prone to precipitation, and anticyclones are prone to high temperatures.

Explanation: The cyclone is low pressure at the center of low altitude and the center of the anticyclone is high pressure. Linking the principle of movement of the air flow, at the same altitude, the air flow from high pressure to low pressure, then.

The center of the cyclone is low pressure, and the surrounding air gathers towards the center, which becomes an updraft, so it is easy to form rainfall. (low-altitude aggregation, high-altitude divergence, updraft prevails in the center, and precipitation is easy to form).

An anticyclone is the exact opposite of a cyclone. Remember Van Gogh, understand the principle, the difference between the two is easy to remember.

A cold front and a warm front are formed by the intersection of air masses, and a cyclonic anticyclone is the high or low air pressure.

Difference Between Cold Front and Warm Front: A cold front is the front of cold air, and at the junction of cold and warm air masses, cold air pushes towards warm air. There are many windy and violent weather on the cold front, and there are many windy and cool weather behind the front; On the contrary, it is a warm front, with more rainy weather on the front, and cloudy and sunny days after the front, and the temperature rises.

The cold front sinks so that it presents a state of bottom protrusion below, and the warm front is light, which is a state of climbing.

In most areas of China, the standard of cold wave is that the average temperature of 24 hours drops by more than 10 degrees, and the minimum temperature is less than 5 degrees. In some areas, appropriate modifications have been made in accordance with the actual local climatic context.

The cold wave is actually a strong cold air, and its main body is the cold high pressure of the anticyclonic nature, and the junction of the cold high pressure and the warm air in front is the cold front, that is, the front of the cold high pressure. Therefore, it is said that the cold front is a manifestation of the southward movement of the cold high pressure, so the cold wave is actually caused by an anticyclone.

I studied geography, and cold waves are formed by cold winds.

In most parts of the country, the standard for a cold wave is a 24-hour average temperature drop of more than 10 degrees, and a minimum temperature of less than 5 degrees. Some areas have been modified appropriately according to the actual local climatic background.

The cold wave is actually a strong cold air, and its main body is the cold high pressure of the anticyclonic nature, and the junction of the cold high pressure and the warm air in front of it is the cold front, that is, the front of the cold high pressure. Therefore, the cold front is a manifestation of the southward movement of the cold high pressure, so the cold wave is actually caused by an anticyclone. Satisfied.

2 Read the following weather system diagram and finish.

1) The circles in Figures A and B indicate the isobaric line, and the dotted arrows in the legend indicate the horizontal pressure gradient force.

2) The names of weather systems A and B, described in terms of air flow conditions, are cyclone and anticyclone respectively and are described in terms of air pressure conditions, which are called low pressure and high pressure respectively

3) In Figure C and D, the weather system corresponding to Figure A is C; The weather conditions indicated are rainy weather.

4) From July to August, the middle and lower reaches of the Yangtze River are controlled by the weather system, which often forms drought weather.

Isobar, horizontal pressure gradient force.

Cyclones, anticyclones, low-pressure cyclones, high-pressure cyclones.

C. Typhoons. Drought (the rain belt is in North China and Northeast China, at this time, the first tropical high pressure in the Jianghuai region controls the formation of drought weather, which is the frequent occurrence of typhoons, which can alleviate the drought in Jianghuai, which is also the only benefit of typhoons. ）