High School Geography Weather System Problems, Common Weather Systems in High School Geography

The relationship between the two is rather ambiguous - I haven't touched these for many years. Try to explain:

When the air pressure at a certain "point" is higher or lower than (periphery), according to the principle of air flow from high pressure to low pressure, an air flow range will be formed, and the resistance of air movement in a large area is very small, and an arc is formed under the influence of geostrophic deflection force - the high altitude looks like a whirlpool, and it continues to circulate and accelerates - this is the cyclone.

Cyclones: The force can be small or large. When it is large enough to shake a few wooden houses, we call it a "typhoon" (or "hurricane");

The area can be small or large. When it is large enough to affect a region, the surface facing this area is called a "front" When the pressure of one "surface" is higher than that of another "surface", an air flow front is formed, and the cold front is always below, when the cold front is stronger, the air is like pouring water from a high altitude Drain to the other side, so the cold front is a rapidly diffusing air flow near the ground, the overall shape is like the "foot" of a goblet, when the warm wind surface is stronger, it will spread to the surrounding area at the same time, it will also spread to the sky, like blowing a balloon. globular bearing) ;

So to sum up: cold fronts and warm fronts are all part of the cyclone, of course, the presence of cold and warm fronts does not mean that the "cyclone" has formed, they are semi-finished "cyclones". If you cross the equator and cross the mountain valley, then there is no chance of forming a "cyclone", forming an S-curve.

A cyclone is formed by the overlapping of numerous warm and cold fronts, that is, as long as the cyclone area is large enough, there must be a warm and cold front.

Geography is generally not so deep, as long as you understand the reasons for the formation of the movement of air currents. So there are relatively few questions, and it is estimated that there will be less than 100 questions.

Strictly speaking, according to what I said above, China's cold wave is a large area of front, if it is said from the entire Arctic Circle, it also belongs to a super-large anticyclone, it can be completely reasonable.

It is a special phenomenon, that is, there is a difference in the specific heat capacity of the sea and land, which leads to the continuous transportation of ocean air to the mainland, which must also include the phenomenon of temperature and humidity, and the formation of "plum rain" in South China and East China. This one is not going to form a cyclone.

1. Anticyclone refers to the horizontal air vortex with a central pressure higher than the surrounding air pressure, which is also the high pressure in the air pressure system.

2. In the process of moving, the cold air mass plays a leading role, pushing the front to move to the side of the warm air mass, and this front becomes a cold front. The cold front is often referred to as the cold air front, which is the vanguard of the cold air from the south, and is the most common weather system affecting China, especially in the winter half of the year.

3. The relationship between the two. A cyclone is a low pressure, an anticyclone is a high pressure, a warmer low pressure (cyclone) moves to a colder high pressure to form a warm front, and a colder high pressure (anticyclone) moves to a warmer low pressure to form a cold front.

4. China's winter cold wave is the cold air of Siberia due to the action of the Asian high pressure southward and causing cold front weather, so the weather system that forms China's winter cold wave should be a cold front.

2. 1. The relationship between the two. A cyclone is a low pressure, an anticyclone is a high pressure, a warmer low pressure (cyclone) moves to a colder high pressure to form a warm front, and a colder high pressure (anticyclone) moves to a warmer low pressure to form a cold front.

2. In summer, the western Pacific high moves westward to China, which should belong to the anticyclonic system.

It is recommended that you take a look at the relevant definitions in the book, or enter the encyclopedia to see, they are all written in great detail.

a) Fronts and weather.

1. The cold air mass is generally denser, below the front; Warm air masses are less dense, above the front. <>

2. The cold air mass and the warm air mass are both relative concepts, which are compared with the temperature of the air mass to the Weinoisy Huaida area, and do not think that the temperature of the cold air mass must be low and the temperature of the warm air mass must be high.

3.The concept of three typical fronts: the cold air mass occupies the initiative as the cold front, the warm air mass occupies the initiative as the warm front, and the cold and warm air mass forces are quite quasi-stationary fronts.

4.The passage of a front will inevitably bring about weather changes, but it will not necessarily produce precipitation. When the warm air mass on the front is relatively dry, precipitation cannot be formed. Such as sandstorm weather in winter and spring in northern China.

5.China is affected by the influence and scope of cold fronts is relatively large, and obvious warm fronts appear less in China, and most of them are accompanied by cyclones. In winter and autumn, it appears in the Yangtze-Huai River Basin and Northeast China, and in summer, it mostly appears in the Yellow River Basin.

Specific cases: 1) Cold front: heavy rain in summer and cold wave weather in winter in northern China.

2) Warm front: a spring rain and a warm, "back to the south of the sky".

3) Quasi-stationary front: rainy weather (May-June) in the middle and lower reaches of the Yangtze River.

Common weather systems: frontal systems (cold fronts, warm fronts), cyclones and anticyclones, frontal cyclones.

1. Frontal system (the relative temperature of cold and warm air masses).

The cold air tease is generally denser, below the front; Warm air masses are less dense, above the front. The cold air mass occupies the initiative as the cold front, and the warm air mass occupies the initiative as the warm front, and the cold and warm air mass forces are quite quasi-stationary fronts.

2. Cyclones and anticyclones.

a..Cyclone: A horizontal vortex in the atmosphere with low pressure at the center and high pressure around it.

b.Anticyclone: A horizontal vortex in the atmosphere with high pressure at the center and low pressure around it.

3. The front surface is resistant to finger wax.

Fronts are associated with cyclones to form a frontal cyclone system. The cyclone forms a front at the outward bend of the isobar, where a cold front is formed at the first place and a warm front is formed at the second place. It presents the characteristics of "cold on the left and warm on the right".

1 Common weather systems: frontal systems (cold fronts, warm fronts), cyclones and anticyclones, frontal cyclones.

2 frontal systems: (cold and warm air masses refer to the relative temperature).

Cold fronts and warm fronts have something in common: the cold air mass is below the front, and the warm air mass is above the front.

The rain is on the side of the cold air mass (the cold front is called the front back, and the warm front is called the front front).

1) Cold front and weather: The cold air mass actively moves to the front of the warm air mass (special called cold wave).

Weather changes: cloudy, windy, rainy, cooling, etc. (there are heavy winds, bringing rain, snow, etc.); After the crossing, the air pressure rises, the temperature and humidity plummet, and the weather changes.

2) Warm front and weather: The warm air mass actively moves to the front of the cold air mass.

Weather changes: continuous precipitation is often produced during transit; After the crossing, the temperature rises, the air pressure drops, and the weather clears.

3. The main thing that affects the weather in our country is the cold front. The sullen rain in summer and the cold wave in winter are all cold fronts and natural ants.

4. Low pressure (also called cyclone) and high pressure (also called anticyclone).

1) Cyclone: The central airflow rises, which is prone to rainy weather.

Horizontal airflow converges counterclockwise in the Northern Hemisphere (a four-finger clasp in the right hand indicates horizontal airflow convergence, and the Dam's pointing up indicates vertical airflow upwards), and horizontal airflow is clockwise in the Southern Hemisphere (left-handed).

2) Anticyclone: The central airflow sinks and the weather is clear. (Such as the dry weather in the Yangtze River basin, the cool weather in autumn).

Horizontal airflow diverges clockwise in the Northern Hemisphere (with the four fingers of the right hand slightly open to indicate horizontal airflow divergence, and the big finger pointing down indicates a sinking central airflow) Horizontal airflow diverges counterclockwise in the Southern Hemisphere (left).

5. Frontal cyclone: The cyclone is low-pressure, and the low-pressure system often appears in the actual atmosphere along the center of the low-pressure trough extending in a certain direction (just like the plastic round basin we use is now flattened), forming a frontal system on the low-pressure trough. The front and cyclone are one (the high-pressure system is not cautious).

Note: In the low-pressure system of the northern and southern hemispheres, learn to judge that the cold air mass is the active cold front and the warm air mass is the warm front according to the direction of the air convergence movement in the cyclone.

Weather systems are divided into frontal systems and low-pressure, cyclonic (anticyclone) systems.

A weather system is an atmospheric movement system with certain spatial structure characteristics of meteorological elements such as temperature, pressure difference or wind. If any, it is characterized by the distribution of space pressure, which is composed of high pressure, low pressure, high pressure ridge, low pressure trough, etc. Some are divided by the distribution characteristics of the wind, such as cyclones, anticyclones, shear lines, etc.

Some are determined by the characteristics of the temperature distribution, such as the front.

So when answering questions, be flexible.

However, when answering the question, the cold front and the warm front in the middle of the question will generally exist at the same time.

A cyclone (anticyclone) is the center of a closed pattern, and a cold front (warm front) is formed by the intersection of cold and warm air masses.

According to the unit bridge height in the middle, the base pressure difference is greater than the surrounding area, and the weather system can be judged to be sensitive and warm, and the surrounding is colder than the middle, which is a warm high pressure.

This weather system can be regarded as a subtropical high, with a westerly jet stream in the north and an easterly jet stream in the south.

Question 6: Envy Type D....Because the middle 50km isotherm sends a trillion upwards. Therefore, it is a high-pressure center. Guess for the heating mass base Question 7 b....Not explained.

The key to the first question is to draw the front, and then combine the wind direction and the north-south position, and you will understand it immediately.

Hope it helps.

The first is a warm front, which looks at the temperature first, the temperature increases from north to south in the northern hemisphere, and the opposite is true in the southern hemisphere.

The answer is d should be a cold front transit.

Low pressure means the same thing as low air pressure.

Low pressure brings rainy weather, high pressure and sunny weather, focusing on low temperature and high pressure, high temperature and low pressure, focusing on the relationship between temperature and air pressure In terms of a large range, the land is low pressure in summer and high pressure in winter. This is an important conclusion.

First of all, low pressure and low pressure are a layer of meaning, and low pressure is simply called low pressure.

It is true that the low pressure is more cloudy and rainy, and the high pressure is more sunny. Because the formation of low pressure is due to the high ground temperature and the updraft, after the air flow rises, low pressure is formed near the ground, then the high temperature of the air flow rises after rapid cooling and liquefaction will form precipitation, so the low pressure is mostly cloudy and rainy days; In the same way, high pressure due to the low local temperature, the formation of a downdraft here (and the cold air goes down, the hot air rises is a reason), then the high pressure near the ground will be formed, and the weather will be more sunny, and this situation also mostly occurs in winter.

This should be discussed in a categorical manner, depending on where you are.

Northern Hemisphere near-surface land: summer (July) - low pressure, winter (January) - high pressure; Near-surface ocean: summer - high pressure, winter - low pressure.

In the same way, the seasons in the Southern Hemisphere are reversed from those in the Northern Hemisphere).

This statement is not contradictory. For example: high pressure and sunny weather, sunny weather does not mean low temperature, our country is controlled by the subtropical high pressure zone in summer, the weather is sunny, because it is the summer of our country, so the temperature is higher.

Therefore, "low pressure brings rainy weather, high pressure and sunny weather" refers to weather phenomena.