Weather and us

Each person, when facing natural disasters, wants to overcome and improve the negative aspects of nature to protect social interests, including himself. Which science subjects help people achieve those desires?

It is meteorology which is a field of many scientific majors such as Astronomy, Physics, Mechanics, Mathematics, Biology, Chemistry, especially Remote Sensing - requires very high technology. Therefore, strong coordination is required to predict the natural disasters that will occur, to prevent us from minimizing human and property losses.

What is the cause?

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Scientists said: The sun - the underlying cause of the weather . The sun is indispensable to the life of the planets. Without the Sun, the Earth was just a soul that was lifeless, dark, cold. Plants - intermediaries between the living and dead nature, between the sun and animals, between the sun and people.

Plants absorb carbon from carbon dioxide (CO ₂ ) in the air and water along with nutrients that are inorganic salts soluble in soil to produce organic matter. During photosynthesis, organic matter is formed, and oxygen is released. The green of the tree is the basis of all living things on Earth.

The ground receives heat from the sun and then radiates heat to heat the air. The rising steam from the Earth's surface forms clouds, rain, thunderstorms, storms, floods, etc. The main factor that causes weather is the solar energy flowing down to Earth. According to scientists, the Earth has only received a fraction of the solar energy of more than two thousand million (1/109) parts of the weather, as complicated as we see it.

When the sun is strong, the temperature difference between the Earth and the equator increases much more than usual. Thus causing a strong exchange between the air masses on Earth. That is why the weather changes abnormally.

Causes of storms

On tropical oceans near the equator, weak winds, the sea surface heats up a lot, makes the water evaporate vigorously, forming a very low pressure area. The surrounding cold air drove, and it was heated and flew high. This process continues strongly. The steam rising to a high temperature has stopped, creating a great heat, and it can make the steam rise even higher. That is the potential to nurture and maintain the development of storms. Two blocks of gas with a large difference in temperature meet (a cold mass of air from the southern hemisphere is a winter overflow to the northern hemisphere) which is a condition that creates an intense spin, the need for storms to appear.

As for the principle of storm generation, it is difficult to forecast the storm, it is even more complicated because the country is located in the East Sea area with stormy eyes, while the facilities and equipment are too poor and really not much experience.

For strong storms (winds greater than 100 km / hour) from level 12 or higher, with clear eye, the number is about 10, 12km. But average storms (winds of 85 km / h) and weak (winds of less than 75 km / h).

Satellite image: Spin of storm Ketsana when entering Central Vietnam.

The error of determining the center of the storm is very large, in some cases up to 100km. In the case of tropical depressions, the error of mind determination is even greater, with cases of deviation up to 200 km. Forecast of trajectory of storm in 24 hours, average error of 150km. Determine the intensity of storms by several levels. Due to the complexity of atmospheric circulation in the East Sea, the storms and tropical depressions that appear here often have a very complicated direction of movement, sudden changes in both direction and intensity '- Mr. Bui Minh Tang , Director of the Central Hydrometeorological Center said.

Methods and technologies of hydro-meteorological forecasting in the world and in Vietnam are similar, including methods: Sy mop (circulation method); statistical methods; mathematical model; experience and traditional methods; analysis of satellite cloud images, radar.

Since there is no perfect, good method in all cases, in the process of making forecasting, it is necessary to research and use, consider all methods and tools combined with the level of experience knowledge of the forecast. tablets.

Scientists believe that human understanding of the atmosphere is still far away from achieving perfection.

Recently in the seminar on " Early Warning of dangerous hydrometeorological phenomena " in Hanoi. All papers provide opinions where we are? Being at an average level compared to other countries in the region.

Although equipment is not new, lack of good people in forecasting work. Song generally meteorological forecasting industry in our country has many encouraging efforts. To minimize the risk of natural disasters, people need to have knowledge about storms and floods, especially the perception of each person about disaster prevention.

Please pay more attention and share with the prevention and control of natural disasters, which is to serve your own material and spiritual interests.