The Great Ming Dynasty Dominate Overseas

Yang Fengnian took out a topographic map of Tuao to popularize science and said: "If an area wants to be humid, it is not enough to be close to the ocean. After all, we cannot directly use seawater as a water source, it is too salty. Only the water on the ocean becomes water. The steam, drifting there, forms a sufficient amount of rainfall, and the region can have sufficient fresh water resources to form water systems such as rivers and lakes, and then it can become humid."

"Look, there is a cold current on the west coast of Tu'ao. This cold current comes from the direction of the ice and snow reservoir in the south. The temperature in the water is very low, which leads to the decrease of the sea water temperature in the entire Western Tu'ao sea area. , can’t produce enough water vapor at all, so it can’t form rain.” Yang Fengnian held a pointer and knocked on the west coast of Tu’ao, drawing a water flow from south to north.

Seeing that some people don't understand, the chief climate expert gave an example of daily life to illustrate: "When we boil water in our life, as the temperature of the water rises, we can gradually see water vapor coming out of the water. At this time, if we put water in the kettle Pour cold water into the tank, and the water vapor will disappear immediately. Here, the cold current is equivalent to pouring cold water into the kettle, cooling the ocean and dehumidifying it, eliminating the water vapor that should have formed rain."

Everyone suddenly realized and nodded to express their understanding.

The following introduction is a bit confusing. Yang Fengnian said: "Our research has found that the air on the earth is also flowing regularly. This flow will cause the air pressure in various regions on the earth to be different. The area where Tu'ao is located is exactly the same. It is a high pressure area, which is the very famous subtropical high pressure.

The air in the subtropical high-pressure area gathers and sinks from high altitudes, causing the air density on the ground to increase, and the air pressure to rise. Under low temperature conditions, when condensation condenses, rainfall will naturally not form, so drought is inevitable. "

The palm of his right hand goes up to indicate the updraft, and the palm of his left is pressed down to indicate the pressure of air pressure, so that the updraft cannot rise to high altitude.

Lots of new words!

"Uh, air pressure, high pressure, and subtropical high pressure are what His Majesty said, and we will perfect them after they are first proposed!" Yang Fengnian saw everyone's doubts, and said something immediately.

Immediately, all eyes were on Yan Changwu. Seeing the emperor's unfathomable appearance, everyone was puzzled. The emperor is a scientist, how could it be possible?

"Originally, even if the internal water vapor cannot lift into the air, blowing water vapor from the outside is still useful. For example, the east is still very humid, where there are lush trees and greenery. Even there." Yang Fengnian pointed his pointer In the northeast corner of the map of Tuao, he said: "The land there even belongs to the tropical rainforest area! It is hot and rainy, and there is a Great Barrier Reef along the coast, mainly coral reefs."

When it comes to tropical rainforest areas, everyone understands that there is a lot of water!

Because Rising Sun City is located in this area, it rained twice in three days, which was very enjoyable.

Yang Fengnian explained that the reason why the eastern part of Tu'ao is humid and watery is that a warm and humid air flow is blowing towards Tu'ao from the Pacific Ocean, which makes the air in the eastern part of Tu'ao warmer and more humid, and the rainfall also increases significantly.

Moreover, the ocean current in the eastern ocean of Tuao is a warm current, which comes from the equatorial region, and its effect is just opposite to that of the cold current in the west. The warm current increases the temperature of the eastern ocean and the evaporation of water vapor. The evaporated water vapor is then carried by the warm and humid Pacific air flow to the eastern part of Tu'ao and turns into rainfall, forming a humid area.

Someone immediately asked: "Such a good airflow and open airflow, why can't it enter the central area of ​​Tuao?"

"Because here..." Yang Fengnian's pointer hit a high tunnel in the east of the Tu'ao topographic map, and said: "There is a big watershed here!"

"Along the eastern coastline, from the northernmost point to the southernmost point, there is a tall mountain range with a length of more than 3,000 kilometers, a width of nearly 320 kilometers, and a narrowest point of 160 kilometers, with an average height of more than 1,000 meters. More than 1,000 meters, it is the highest peak in the entire Tu'ao region.

This mountain range is like an impenetrable wall built in the east of Tu'ao, trapping all the warm and humid air in the narrow strip along the eastern coast. On the eastern windward **** of the mountain range, there is abundant precipitation, lush plants, and a warm and humid climate, which is very suitable for human habitation.

On the west side of the mountain, the rainfall is scarce, the climate is arid, and it looks extraordinarily desolate, forming a scene with clear divisions. This mountain range is called the Great Dividing Range, which is also decided by His Majesty Chrysostom! "Yan Changwu was a map editor in his previous life. He went to the Great Divide and saw the scenes there, so he named this mountain range the Great Divide.

Upon hearing this, everyone felt that His Majesty's naming was really appropriate.

The effect of the Great Dividing Range on intercepting airflow is obvious. The high mountains can block the monsoon rich in water vapor, and the precipitation on the windward side increases, while the precipitation on the leeward side is less, resulting in different precipitation on the east and west sides of the Tu-Australia Great Dividing Range. It is gratifying, there are too many to use up, and one side is pitifully small.

Yang Fengnian's data is very sufficient. It has been monitored that in many places on the windward slope, the annual precipitation reaches several thousand milliliters, while in some places on the leeward slope, the annual precipitation is only 100 milliliters, and the precipitation decreases as you go west.

"In this way, the subtropical high pressure prevents water vapor from condensing into rain, and the Great Dividing Range in the east prevents the warm and humid airflow from the Pacific Ocean from penetrating into the inland, coupled with the cooling and dehumidification effect of the cold current from the Antarctic region in the western ocean, resulting in Tuao being so dry There are three main reasons, which hinder us from developing Tuao on a large scale." Yang Fenglai said in his closing statement.

"Not only that." Since Yang Fengnian had the opportunity to speak in front of the empire and senior officials, he said a few more words.

"The land in Tu'ao is ancient, and it is continuously washed by rainwater, and the nutrients in the land are seriously lost. There are three ways to naturally enrich the land: one is volcanic ash; the other is the grinding of the soil bed by glacier movement; the third is The earth’s crust is slowly rising, but these are almost nonexistent in Tu’ao. Tu’ao has no volcanoes, no glaciers, and thirdly, geological stability, and almost no earthquakes, which means that the ground cannot be turned up, and the fertile soil below must be turned up.”

This is the first time everyone has heard that earthquakes are good~www.wuxiaspot.com~ and they are all amazed.

"Tuao has poor land, insufficient nutrients in the water, not many rivers, large seasonal changes, and poor freshwater aquaculture. Another serious problem is salinization. The soil in the southwest has been blown from the Indian Ocean for millions of years. Salt, in the inland basins there used to be freshwater lakes that were separated from sea water. After the water evaporated, the salinity of the lake water increased. After drying up, the remaining salt was blown to the eastern region, and the southeastern region was not much better. Frequent seawater intrusion, the seawater recedes, leaving a lot of salt.

Therefore, without water, the salinity cannot be reduced. It is very difficult for us to grow more food. Only those trees and pastures that are resistant to alkali can survive. This is why Tuao is suitable for raising livestock but not for raising people! "

He said a series of scientific and technological terms, which actually cost the empire a lot of funds and manpower research to figure out the fact that Yan Changwu clapped his hands first, and everyone clapped together to thank the experts for their science introduction and let them understand why Tuao Even if it is surrounded by the sea, it cannot escape the fate of becoming the driest area in the world.

"So, do you understand the solution to the drought in Tu'ao?" Yan Changwu asked.

Immediately, everyone's heart was agitated, and they all looked at the Great Divide in unison! 2084/10529523