All parts of the atmosphere does not receive energy in a homogeneous manner. This difference leads to air motion following the principle that warm air is likely to reach high altitudes due to its low density compared to cool air. The difference in temperature and pressure is one of the key points responsible for atmospheric motion. In this study, we will try to give a simple and complete description of the principal causes of motion in our atmosphere and explain an impressive phenomenon linked to atmospheric instability, avoiding any annoying calculation, simply by referring to our logic.
The general dynamism of atmosphere refers to all the causes of air displacement in the atmosphere. These tendencies are under the influence of a force: the Coriolis Force which is responsible for curbing atmospheric trajectory. We should also deal with other factors on which atmospheric motion depends. The effect of gravity issues directly from the problem of air density, so it should be taken into account as well as the rotation of the earth characterized by the Coriolis force. Under these assumptions, one needs to set limits to the problem to comprehend it and to make it as much realistic as possible.
[...] The air on the Kamel Bouzebra Principal causes of motion of the atmosphere. surface of the ground then runs out horizontally towards these points of eruption and shapes storm clouds. The tornados occur in the ascending currents of the storms. The storms appear in an unstable atmosphere such as when a mass of air starts to rise; its speed grows during the rise. In the atmosphere, the pressure, and usually the temperature, decrease with altitude, therefore, an ascending mass of air cools while dilating, owing to the pressure decrease. [...]
[...] Even if the celerity and the direction of the wind are mostly determined by the gradient of pressure, the moment of the day plays an important role. During the diurnal cycle, air is heated and raised as heat increases. Because this mass of air moves slower than the air at a higher altitude, their mixing decreases the velocity of the latter air. This mass is replaced at the ground level by cooler air from higher layers, thus producing gusts. By night, the ground is cooler which slows the rhythm of the previous cycle, weakening gusts on the surface and strengthening winds in high altitude. [...]
[...] (Fig.1) Fig.1 Simple convective cells of atmosphere Fig.2 Real convective cells In reality, air doesn't wait until it reaches the pole to get cooled, it happens earlier forming smaller cells around the globe called cells of Hadley, cells of Ferrel, etc the different names exist only because cells have been discovered in different latitudes by different scientists (Fig.2). Now, if we get closer to what really takes place, by adding the rotation of earth we Kamel Bouzebra Principal causes of motion of the atmosphere. consider the Coriolis force; added to the action of convective cells, the air trajectory is deflected in what is called horizontal displacement. This horizontal movement is mainly known as wind and when we talk about wind, the concept of pressure comes into play. [...]
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