Ask for help about the geography wind

The formation of the wind. In short, in nature, there are different winds in different regions and in different seasons, but winds are formed by the movement of air (air blows from a cold place to a hot place).

In coastal places, there is a sea breeze during the day and a land breeze at night. This is because the sun shines on the earth, and the temperature on land is higher than on the sea during the day, and the hot air on land is constantly rising, and the cold air on the sea surface is constantly flowing to the land to replenish, and this air flow from the sea to the land forms the sea breeze. At night, the temperature on land drops very quickly, and the temperature on the sea surface drops very slowly, so the temperature on the sea surface is higher than on land, so the cold air on land is supplemented by flowing to the sea surface, and this atmospheric flow forms the land breeze.

In the mountains, there are also valley winds. When the sun comes out during the day, the sunlight shines on the hillside, and the temperature of the air layer close to the hillside rises, and the hot air rises along the hillside, and the cold air rises from the valley to the top of the mountain to replenish it, and this top-down air flow forms the valley wind. At night, when the sun has set, the summit and the mountainside cool very quickly, so the thin layer of air near the summit and the mountainside also cools quickly, while the air that accumulates in the valley is still warm, and the cold air near the summit and the mountainside flows to the bottom of the valley, forming a valley wind.

In most parts of our country, there is more southeast wind in summer and northwest wind in winter, this is because our country is east of the Pacific Ocean, and in summer, the temperature of the continent is higher than that of the ocean, and the cold air flows from the ocean to the mainland, so the southeast wind blows. In winter, the temperature on the continent is lower than that of the ocean, and the cold air from the continent flows to the ocean, so the northwest wind blows more.

Whether it is the sea breeze, land breeze, valley breeze, northwest wind, southeast wind, it is formed by the sun's irradiation that causes the earth's atmosphere to flow.

Determination of wind direction: If the air flows from the west to the east, it is called a west wind. Others and so on. In other words, the direction of the wind is the direction of the wind from which the wind comes.

Wind is the movement of air.

The flow of air is always from the area of high pressure to the area of low pressure.

The air temperature is high and the air pressure is low, and the air temperature is low and the air pressure is high.

Wind direction refers to the direction in which the wind is coming from. For example, the wind blowing from the Philippines to Guangdong and Fujian in China is called the southeast; The wind that blows from the Indian Ocean to the southeast of our country is called southwest; The wind blowing from A (135°E, 10°N) to B (129°E, 27°N) is called southeast.

Meteorologically, the direction in which the wind is blowing is determined as the direction of the wind. Therefore, the wind coming from the north is called the north wind, and the wind coming from the south is called the south wind. When the weather station forecasts the wind, when the wind direction swings left and right in a certain direction and cannot be determined, the word "bias" is added, such as northerly wind.

When the wind is very small, it is explained by "uncertain wind direction". The unit of measurement of wind direction, which we express in terms of bearing. For example, on land, Weila is generally represented by 16 directions, and at sea it is mostly represented by 36 directions; At high altitude, it is expressed by angles.

The wind direction is expressed in an angle, which divides the circumference into 360 degrees, the north wind (n) is 0 degrees (i.e., 360 degrees), the east wind (e) is 90 degrees, the south wind (s) is 180 degrees, and the west wind (w) is 270 degrees, and the rest of the wind direction can be calculated from this. This is shown in the image on the left. In order to represent the frequency of wind occurrence in a certain direction, the quantity of wind direction frequency is usually used, which refers to the percentage of the number of times a certain direction of wind occurs and the total number of times of wind occurrence in each direction in a year (month), that is:

Wind Direction Change Number of occurrences of a certain wind direction Total number of observations of wind direction 100% Wind direction graph.

From the calculated wind direction frequency, it is possible to know which wind direction is more and which wind direction is the least in a certain area. According to the observations, northerly winds (northerly, northeasterly, and northwesterly) are mostly blows in North China, the Yangtze River Basin, South China and coastal areas of China in winter, and southerly winds (southerly winds, southeast winds, and southwest winds in drafts) are mostly blown in summerOne of the instruments for determining the wind direction is the wind vane, which is generally 10-12 meters high from the ground, if there is an obstacle nearby, the height of the key mountain should be at least 6 meters higher than the obstacle, and the short rod pointing north should be facing the north.

The direction in which the wind arrow points indicates the direction of the wind at that time. There is also a rectangular air pressure plate (800 grams for the heavy and 200 grams for the light one) next to the air pressure plate, which is equipped with a curved frame with long and short teeth. The number of long and short teeth raised by the air pressure plate indicates the strength of the wind.

At present, meteorological stations generally use the EIJ type electric wind direction anemometer designed and manufactured by China.

Wind. Wind direction refers to the direction in which the wind is coming from. A unit of measurement for the direction of the wind, expressed in terms of bearing.

On land, it is generally represented by 16 directions, and at sea it is mostly represented by 36 directions; At high altitude, it is expressed by angles. The wind direction is expressed in an angle, which divides the circumference into 360 degrees, the north wind (n) is 0 degrees (i.e., 360 degrees), the east wind (e) is 90 degrees, the south wind (s) is 180 degrees, and the west wind (w) is 270 degrees, and the rest of the wind direction can be calculated from this. In the forecast of the **meteorological station, there is a symbol on the big screen to indicate:

Like an F, where the "Fu Wei" (downward vertical) indicates the direction of the wind; The "stem" (horizontal on the right) indicates the magnitude of the wind, and the stem is proportional to the wind

(1) Select B; (2) Choose B.

Analysis: (1) According to the direction of air flow movement, 1>4,3>2 in the same horizontal direction, because the air movement in the same horizontal direction is caused by the difference in air pressure; Vertically, the higher the altitude, the lower the air pressure, so 4 > 3, but because the air moves in 3 places to 2 places and accumulates, there will be 2 downward to 1 direction of movement.

2) To be blown by the sea peaks, that is, to blow the air from the sea to the land. From 8 a.m. to 17 p.m., the ocean temperature is lower than the land temperature, and the air blows from the sea to the land at the same level.

(1)b (2)b

Explanation: (1) The wind blows from high pressure to low pressure, and the high and low pressure are relative to the same horizontal plane, so it can be seen from Figure 1 that the air pressure of 4 is lower than 1, and the air pressure of 2 is lower than 3, and at the same time, the air pressure at low altitude is always higher than the air pressure at high altitude, so the air pressure at 2 is the lowest in comparison.

2) In order to achieve the effect of "the heroine faces the sea, and the hair flows back under the sea breeze", then the wind must blow from the ocean to the land, that is, the sea breeze. As can be seen from the temperature chart, the temperature of the ocean is lower than that of the land from 8 o'clock to 17 o'clock, and the temperature of the ocean is low compared to the land, and the air pressure is relatively high, and the wind will blow from the ocean to the land, forming a sea breeze.

（1）b。The air pressure on the same vertical plane decreases with the increase of height, so first exclude a and d, and the correct answer is selected in b and c. And the same horizontal plane, is the high pressure flow to the low pressure, which can be seen from the flow direction of high air pressure (flow to place) in Figure A

The air pressure is lower than the air pressure at the point. Therefore, choose B.

2）b。When the heroine faces the sea and her hair flows back, the air blows from the ocean to the land. From Figure B, it can be seen that the ocean temperature is lower than the land temperature from 8 o'clock to 17 o'clock, and the ocean pressure is higher than the land pressure at the same level, so the air is blown from the ocean to the land at this time.

Therefore, choose B.

First of all, it is clear that both the Northern Hemisphere and the Southern Hemisphere wind blows from high pressure to low pressure, so you need to determine the position of the high and low pressure first, and then you can judge the wind direction based on the geostrophic deflection force (Northern Hemisphere bias, Southern Hemisphere bias to the left). The last point is that where the isobars are dense, there is a lot of wind, and where the isobars are sparse, the wind is small.

It is correct that the westerly wind zone has the same direction as the wind near the ground. The "three-circle circulation" is just a theory.

There are many answers to the reasons why the western version of the wind belt does not conform to the theory of rational rights, and one of the more convincing causes is:

In the Northern Hemisphere, for example, the wind belts of the three-circle circulation from low latitude to high latitude are the northeast trade wind belt, the prevailing westerly wind belt, and the polar easterly wind belt.

That is, the prevailing westerly wind belt is connected to the polar easterly wind belt in the north and the northeast trade wind belt in the south.

The northeast trade wind belt is southwesterly. The upper-air wind direction of the polar easterly belt is also southwesterly. In this way, the prevailing westerly wind belt between the two is "driven" by the upper altitude, and eventually a westerly wind is formed.

First of all, how does the wind come about? This involves changes in air pressure, air always flows from a place with high air pressure to a place with low air pressure, and the higher the temperature, the lower the air pressure, so that is to say, the climate of a place in winter and summer is also the temperature is different, so the pressure of the same air pressure zone is different in different seasons.

Let's talk about the southeast monsoon in the finale, because in summer, the specific heat capacity of water (physical knowledge) is larger than that of land (in fact, the specific heat capacity of water is the largest), so the temperature of the land is higher than the temperature of the ocean, so the air pressure on the ground is significantly lower than the pressure of the ocean, so the southeast wind is generally blowing, and in winter, the temperature of the Eurasian continent is very low, and the ocean temperature is higher, so there will be a northwest monsoon, or the cold wind blows north to the south, which is actually a seasonal temperature change.

And the trade winds are markedly different from here.

Here is a quote from the encyclopedia (actually, stillThe difference in temperatureThe formation of trade winds under the long-term exposure of the sun, the equator is heated the most, and the air near the surface of the equator is heated up, forming an equatorial low pressure zone near the ground, forming a relative high pressure at high altitude, and the high air pressure at high altitude moves to the direction of high air depression in the north and south, and due to the influence of the geostrophic deflection force, it is deflected parallel to the isobar line near 30 degrees north and south latitudes, where the atmosphere accumulates and is forced to sink, forming a subtropical high pressure zone near the ground. At this time, a pressure difference occurs between the equatorial low pressure zone and the subtropical high pressure zone, and the air flow flows from the subtropical high pressure zone to the equator.

Under the influence of geostrophic deflection force, when the air in the subtropical high in the Northern Hemisphere moves southward, the air movement is biased to the right of the pressure gradient force, forming a northeast wind, that is, the northeast trade wind. In the southern hemisphere, the southeast trade winds are formed.

The monsoon is seasonal, while the trade winds are more stable, the trade winds are belted, why are there no trade winds in China? Because the Eurasian continent is big enough to change the climate

I don't know if it's easy to understand.

Wind direction refers to the direction in which the wind is coming from.

The main forces influencing near-surface winds are the horizontal pressure gradient force, the geostrophic deflection inward and the frictional force.

From the title, it is known that in the Northern Hemisphere, the geostrophic deflection force is biased to the right. According to the principle of hot low pressure and cold high pressure, it can be known that the upper left corner of the isobar diagram is the center of low pressure, so the horizontal pressure gradient force points to the center of air pressure and is perpendicular to the isobar, and then deflects to the right, you can get the southwest wind.

The wind direction on the map is represented in the same way as the circulation wind direction.

The arrows on the map point not in the direction of the wind in that place, but in the direction of **. For example, if the arrow indicates the southeast, then the wind direction should be northwest.

The same is true for the direction of the circulation winds. For example, the southeast trade wind, the arrow should point to the northwest.

Therefore, the wind direction refers to the wind blowing from the **, which is what the wind direction is. In other words, the arrow in the direction of the wind points to **, and its opposite direction is the direction of the wind.