In the face of Zachdan's serious question, many staff officers and officers present did not know how to answer, because they themselves did not have an accurate answer, the accident time was too short, and they had not received a report from the front line until now.

At the critical moment, it was the Eagle Falcon trainer who was attached to the whole army and made a report, "Report to the general, I may know the answer." ”

Zachdan's eyes kept staring at the smoke rising in the distance, and from time to time he looked back at the arrangement of his team's array, but his ears heard the report of his subordinates, and he immediately commanded in his mouth. ”

"General, the falcons in the army have already made a trip to Jinzhou City this morning, but because of the thick fog in the coastal area, the falcon's vision is blurred and it can't see, so it flew around and came back.

This is probably one of the reasons why today, many intelligence units under the Ministry of State Security, intelligence support units dispatched by the General Staff Department, and reconnaissance units dispatched by our army in advance did not discover the enemy's traces until the enemy cavalry rushed 10 kilometers in front of us.

Well, this is just the words of the subordinate family, and it cannot be used as a final conclusion. ”

Zakdan's brow furrowed when he heard this explanation, as a family of hunters living in the mountains and forests of the interior, he had no experience of living in coastal areas.

Even in the days when he followed Chen Xin to fight the world, he fought on the Korean Peninsula every day, and the enemies were as far away from the coastline as possible because of their naval superiority, so far, he had never seen foggy weather that could obscure people's sight.

At this time, I suddenly heard such an explanation, and I felt that I really couldn't understand why the "merely" fog would have such a big impact.

Since he has doubts, he naturally has to ask on the spot, and Zachdan learned this from Chen Xin, and he will never pretend to understand and pretend to understand it.

"Fog, will it have such a big effect? Also, at this point in time, why is there still fog? ”

The officer who spoke just now was also stunned when he heard Zachdan's question, but fortunately, he was a professional investigator, and he had specialized knowledge in geography, climate, and other aspects in the lecture hall.

Coupled with practical experience and theoretical knowledge, he knows these things in detail.

"Then, since the general asked, his subordinates will show off a few words a little, and if there is anything wrong, I will ask all comrades to add and correct it."

After a little politeness, the officer organized the wording and began to popularize science: "The subordinates first said what [fog] is, in the lecture hall, the subordinates listened to the gentleman's explanation, where the atmosphere is due to the condensation of suspended water vapor, when the visibility is less than 1 km, meteorology calls this weather phenomenon fog."

There are many restrictions on the formation of fog, one is cooling, the other is humidification, increasing the water vapor content.

Next, according to what they learned in class, the subordinates will talk about the types of fog, which has a total of 5 classifications.

The first type is called radiant fog, which mostly occurs at night and early in the morning when it is clear, breezy, and has abundant and stable near-surface water vapor or has temperature inversion.

The second type is called advection fog, which is a kind of fog formed by the horizontal movement of warm and moist air, through the cold ground or water surface, and gradually cooling, which is called advection fog in meteorology.

The third type is called mixed fog, which is sometimes formed by both of the above two reasons, which is called mixed fog.

The fourth type is called evaporative fog, evaporative fog is that cold air flows through the warm water surface, if the air temperature and water temperature are very different, then due to the evaporation of a large amount of water vapor from the water surface, the cold air near the water surface will condense into fog.

At this time, there is often an inversion layer on the fog layer, otherwise the convection will dissipate the fog. Therefore, the evaporation fog has a small range and weak intensity, and generally occurs around the pond in the second half of the year.

The fifth, and last, type of fog is called smoke, which everyone has basically seen, and that is the smoke in the city.

The smoke in the city is different from the naturally occurring fog described earlier, and it is caused by another cause, and that is human activity.

Morning and evening are the peak period for cooking fires, and a large amount of pollutants such as soot and suspended solids are not easy to diffuse under the conditions of low air pressure and low wind, and are easy to form smoke (fog) when combined with water vapor in the low-level air.

This kind of smoke, everyone should have a deeper understanding in the winter of Yizhou, that is, in the coldest period, when the collection is warm, the thick black smoke in the sky, and this smoke (fog) often lasts for a long time.

Next, the subordinates will talk about the situation of the fog in detail.

In the atmosphere near the ground, there are countless small droplets of water with a diameter of about a few thousandths of a millimeter floating in the air, making the sky and the earth white and the distance between the visible is small, this weather phenomenon is called fog.

So, how does fog form? We know that there is a limit to the amount of water vapor that can be contained in the air, and when it reaches its maximum, it is called water vapor saturation. The higher the temperature, the more water vapor can be contained in the air.

If the air contains more water vapor than the amount of saturated water vapor at a certain temperature, the excess water vapor will condense and become small water droplets or ice crystals, so the water vapor in the air will condense into water droplets if it exceeds the saturation amount, which is mainly caused by the decrease in air temperature.

The loss of heat from the ground will cause the temperature of the ground to drop, and at the same time, it will affect the air close to the ground, so that the temperature of the air will also decrease.

If the air near the ground is quite humid, when the temperature drops to a certain level, some of the water vapor in the air will condense and become many small water droplets, suspended in the space near the ground.

If there are too many small water droplets in the layer of air near the ground, visibility is low, and fog is formed.

This is fog. Both it and clouds are caused by a drop in temperature, and fog can actually also be said to be clouds close to the ground.

Fog does not fall from the sky or come out of the earth, it is condensation of water vapor in the air. However, he has a close relationship with the temperature and humidity of the sky and the earth.

Fog and clouds are water vapor condensates made up of small droplets or ice crystals floating in the air, except that fog is formed in the near-surface layer of the atmosphere, while clouds are formed in the higher layers of the atmosphere.

Since fog is a condensate of water vapor, its cause should be found in the conditions that cause the condensation of water vapour. There are two reasons why water vapour in the atmosphere is saturated.

One is due to evaporation, which increases the water vapor in the atmosphere.

The other is due to the cooling of the air itself.

Cooling is more important for fog. When there are condensation nuclei in the air, condensation occurs when the saturated air continues to increase or smelt. Fog forms when condensed water droplets reduce horizontal visibility to less than 1 km.

In addition, excessive wind speed and strong disturbances are not conducive to the formation of fog.

Therefore, fog is most likely to form in areas that are conducive to the cooling of the lower layers of the air, if there is sufficient water vapour, mild winds, stable atmospheric stratification, and the presence of a large number of condensation nuclei. In general, there is more chance of fog formation in some industrial and populated areas of the country, where condensation nuclei are abundant.

According to what is said in the lecture hall, fog is very harmful.

In addition to the serious impact on traffic that we all know, because of its strong adsorption, the droplets containing a large number of pollutants will also increase the risk of rhinitis, pharyngitis, bronchitis and lung cancer.

In addition, the chemical composition of the droplets can have a strong corrosive effect on the metal. Even allowing fog droplets to fall on crops can reduce crop yields.

Generally speaking, there is a lot of fog in the morning of autumn and winter, Liaodong is now in winter, we are in the coastal area, not far from the sea, plus the smoke caused by the burying pot in Jinzhou City, so there is now this kind of fog obscuring the sight. ”