Why is noon hottest, and why is it cold in the morning and hot at noon?

The hottest you are talking about is the temperature that the human body feels, and that should be the atmospheric temperature, and the atmospheric temperature is actually the highest temperature at 2 o'clock in the afternoon, and the so-called 12 noon refers to the surface temperature reaching the hottest. For the same area of the ground, the heat radiation of the sun in the morning and evening reaches the path of the atmosphere through which the ground passes, the heat loss is large, (absorbed by the atmosphere), and the heat that reaches the ground is less, and the sun is perpendicular at noon, the heat absorbed by the atmosphere is relatively less, the surface temperature rises quickly, and the surface absorbs heat and also radiates to the atmosphere, and at 12 o'clock at noon, the surface temperature reaches the maximum, after which the surface temperature begins to fall, but the radiation to the atmosphere continues, so the atmosphere continues to heat up. This process takes about 2 hours, so at 2 p.m., the atmospheric temperature reaches its highest, and that's when it feels the hottest!

In fact, the sun at noon is not the hottest, but the height of the sun at noon changes with the movement of the direct point of the sun, and the angle of the sun to the ground at that time is close to 90 degrees, so it is the hottest, but this is not the case in every place.

After 2 o'clock in the afternoon, it is the hottest time of the day. Because the sun was closest to the earth at that time, the angle at which the sun hit the earth was almost perpendicular.

In fact, noon is not the hottest, but at 14 o'clock in the afternoon, when you are in the closest position to the sun, because the Earth's orbit is elliptical.

Because the sun was closest to the earth at that time!

It is related to the angle of direct sunlight

Look at the geography book on high school 1!

Surface radiant temperature is the highest.

Because the sun shines directly at noon.

Not the hottest at noon.

It's an hour or two after noon.

The main reason for the occurrence of cold mornings and hot noon is caused by changes in the intensity of sunlight.

On a sunny day, the sun begins to rise in the east in the morning, and as the sun rises, the intensity of the light hitting the ground becomes stronger and stronger, and the air temperature increases as the intensity of the sun's rays increases.

By noon, the intensity of the sun's rays hitting the ground is strongest, and the air temperature rises very high. So the morning is colder and the middle of the day is hotter.

In spring, it is cold in the morning and hot at noon. Because in early spring, sunlight has energy, and the temperature of the surface will increase when the sunlight radiates to the ground, and the temperature will drop compared to the daytime when there is no direct sunlight at night, so it is cold.

At noon, the sunlight hits the ground directly, the light area is larger than that in the morning and afternoon, the sunlight is strong, and the energy radiating to the unit area per unit time is more, so it is warm, and with the growth of time, it appears hot.

Noon is hotter than in the morning because the sunlight is directly on the ground at noon, and the morning sunlight is oblique on the ground.

So noon is hotter than morning. In fact, the heat and coldness of the weather are mainly determined by the temperature of the air. The main factor of air temperature is determined by the intensity of solar radiation, but solar heat is not the main reason for the direct increase in air temperature.

Because the heat energy directly absorbed by the air into the sunlight is only a small fraction of the total heat energy of solar radiation, most of which is absorbed by the ground. The ground absorbs the heat of solar radiation, and then conducts it upwards to the air through heat transfer methods such as radiation and convection, which is the main reason for the increase in temperature.

In short, the fact that the sun is hot at noon and colder in the morning is not because the sun is far or near our earth.

In the morning, the sun is oblique, and the rock regrets and the height is small, so it feels cool; At noon, the sun is shining directly and at a high altitude, and if there are many traces of heat reaching the ground, it feels very hot.

At noon, when the sun hits the surface, the temperature rises, and in the morning the sun does not reach the surface, and it is normal for the temperature to be low.

In one day, the distance between the sun and the earth.

It can be considered a fixed value.

It feels hotter at noon, not because of the proximity to the sun, but because of the solar altitude angle.

Larger, equal solar radiation.

The atmospheric distance is short, the atmosphere is weakened less, and the solar radiation reaching the ground is more; At the same time, due to the large solar altitude angle at noon, the area dispersed by the same amount of solar radiation is relatively small, and the energy obtained per unit area is more, and the temperature is of course relatively high.

In the morning, it feels cooler, not because it is far from the sun, but because the solar altitude angle is small, and the atmosphere through which the same amount of solar radiation passes is long, and the atmosphere is weakened more, and the solar radiation reaching the ground is relatively small; At the same time, due to the small solar altitude angle at noon, the area dispersed by the same amount of solar radiation is relatively large, and the energy obtained per unit area is less, and the temperature is of course relatively low.

In addition, the perihelion of the Earth in its orbit is at the beginning of January every year, which is the coldest time of the year in the Northern Hemisphere; The Earth is in an orbital orbit at aphelion.

It's early July, which is the hottest time of the year in the Northern Hemisphere.

Because the sun in the morning is not as hot as it is at noon.

Many people pay great attention to the temperature in summer, because if the temperature is too high, it will cause great trouble in our lives. And some people who are not in good health, if they spend it in the high temperature of summer, then there will be irreversible harm, which is also a very unworthy thing. And a lot of people have always thought that the hottest time of the day is noon, and they will do some heat prevention measures at noon, and this is also a very normal thing.

But this is not the case, the hottest time of the day is not noon, so some people may wonder. Is it 12:00 p.m. at the hottest time of the day?

Why is it that some evenings are hotter? Now let's talk to you.

First of all, it's worth affirming that the hottest part of the day isn't 12:00 noon, but around one or two o'clock in the afternoon, because we all know that it's a very hot phase. And we can feel it in our daily lives, at 12:00 noon

The temperature at 00 was not very high, and it was just reaching a hot state. So it doesn't cause any harm to our body, which is a very normal thing.

Secondly, the hottest time of the day is around 2:00 p.m., and the temperature can sometimes be even higher in the evening. Because we all know that this is a process of heat accumulation, so after a whole time cycle, then a very high temperature is reached.

And the evening is actually very hot, which will bring a lot of damage to our body. Because in the evening, the whole ground has accumulated a very high temperature, and there is no excessive heat dissipation.

All in all, in fact, when it is very hot, we must take measures to prevent heat. And in the evening, we should not go out to bask in the sun, which is a very unworthy thing, so we must pay attention to protect ourselves in daily life. That's all for that, I hope it helps you.

The hottest time of the day is not 12 noon, around 2:00 p.m. is the hottest. After a day of hot weather, coupled with the relatively small temperature difference between day and night, the temperature will be higher in the evening.

The hottest place of the day is not at 12 noon, but at 2 pm. It may be due to the fact that the temperature rises in the afternoon and the heat during the day accumulates at night, so the temperature is higher at night.

The hottest part of the day is not 12 o'clock at noon, the evening is very hot, mainly because the temperature drops in the evening, and the temperature drop will cause the gas temperature on the surface to suddenly appear, so it will feel very hot.

On the one hand, it is just starting to get hot, and it is still cool near the surface, and now the high temperature is very short in a day, most of the time the temperature is only in the twenties, and in the next month, I am afraid that it is such a high temperature from morning to night, and the surface has accumulated a lot of heat. Every day is hot.

Open windows in the morning and evening when temperatures are low to let in cold air. Don't open the windows at noon to let the heat in. The indoor temperature is relatively low.

This is when the heat accumulates during the day.

Start transpiring from the ground.

So it's going to be hot.

The interior is relatively closed.

It is difficult to dissipate the heat once it comes out.

So it's especially hot.

The reason is that it takes a certain amount of time for the earth to absorb this heat, and it takes a certain amount of time to release the heat. Therefore, the hottest time is at 2-3 o'clock in the afternoon.

The Earth is encased in a dense atmosphere. Sunlight does not directly heat the air close to the ground, but heats the ground first. The ground then feeds the tropics into the air through infrared radiation, air convection and water evaporation.

After noon, the ground temperature can continue to rise, and the ground temperature can only rise to the maximum when the heat released by the ground is equal to the heat of the sun; And the increase in the temperature near the ground must be obtained from the first amount of laughter released from the ground, and it all takes time.

In the morning and evening, when the sun is near the horizon, the sunlight is oblique, and the sunlight is in the atmosphere.

The long distance traveled and the low amount of heat energy received from the ground are the main reasons for the low temperature.

At noon, the sun is in the sky, the direct sunlight is staring at the cluster (in high latitudes, the angle of irradiation at noon is also the largest of the day), the sunlight passes vertically through the atmosphere, the distance experienced is short, the heat loss is less, the ground gets the most heat energy, and the infiltration is the main reason for the high temperature.

In addition, due to the accumulation of heat on the ground, the evening is warmer than the morning, and the hottest time of the day is 1 00 3 00 in the afternoon.

Q: What about the cool temperatures in the morning? Or is it high at noon?

The temperature at noon is higher than in the morning, is the sun earlier at this time, and the morning is closer to us? Neither is it. The main reason is that the sun hits the earth obliquely in the morning and the sun shines directly on the earth at noon.

At the same time, in the same area of Spring Mountain, the heat of direct radiation is higher than that of oblique injection. At the same time, at night, the heat of the sun shining on the ground dissipates, so it feels cool in the morning; At noon, the heat of the sun hits the ground, so it feels hot.

In the morning and evening, when the sun is near the horizon, the sunlight is oblique, and the sunlight travels a long distance in the atmosphere, and the ground receives very little heat energy, which is the main reason for the low temperature.

At noon, the sun is in the sky, direct sunlight (in high latitudes, the angle of irradiation at noon is also the largest of the day), the sunlight passes vertically through the atmosphere, the distance experienced is short, the heat loss is less, and the ground gets the most heat energy, which is the main reason for the high temperature.

In addition, due to the accumulation of heat on the ground, the evening is warmer than the morning, and the hottest time of the day is 1 00 3 00 in the afternoon.

The hottest time for people to feel the sun (that is, the hottest weather) is around two o'clock in the afternoon in summer. As we all know, the main factor affecting air temperature is the intensity of solar radiation, and solar heat does not directly increase the air temperature. The heat energy of various gases in the air directly absorbs sunlight is only about 14, while about 43 of the heat energy is absorbed by the ground.

After the ground absorbs the heat of solar radiation, it is transmitted to the air through radiation, convection, turbulence and other forms, and the result of this upward heat transfer is the main reason for the increase in temperature. Therefore, the increase in ground temperature is mainly the result of absorbing solar radiation energy. To put it simply, the sunlight shines on the ground, heats the ground, and the heat absorbed by the ground is released to warm the air, and the temperature of the air is mainly obtained indirectly from the ground.

Although at 12 noon in summer, the sunlight hits the ground closest to the direct rays, and the ground and air are strongly heated, but the heat released by the ground is less than the heat of the sun, so this is not the hottest time. After noon, the ground temperature can continue to rise, and the ground temperature can only rise to the maximum when the heat released by the ground is equal to the heat of the sun; The increase in the temperature near the surface must be obtained from the heat released from the ground, and it all takes time, so the hottest time in summer is not 12 noon, but around 2 o'clock in the afternoon.

The sun is at its highest altitude and hits the ground directly, and the ground gets the most heat per unit area.

The sun shines directly at noon, which is hotter, and the morning and evening are oblique, which is certainly not too hot.