The idea of anticyclone It is used in the field of meteorology. The concept alludes to an atmospheric phenomenon that supposes, in the northern hemisphere, a high pressure zone with the wind circulating in the same direction as the needles of the watch, while in the southern hemisphere the reverse occurs. The anticyclone, in general, makes the weather clear, stable and without rain.
In an anticyclone, in this way, the atmospheric pressure is higher than the Pressure of the surrounding air. The air in the anticyclone makes a downward movement from the highest layers of the atmosphere towards the earth’s surface. This phenomenon, which is called subsidence, makes it difficult for clouds to form, contributing to the good time.
The drop in air can be due to different reasons. When the movement is produced by a process of advection in the elevated area, we speak of dynamic anticyclone. The weatherIn these cases, it is hot and dry, with a strong presence of the sun.
If the air mass falls due to being at a lower temperature than the surroundings, it is a thermal anticyclone. The descent of the air increases the atmospheric pressure and the temperature it falls with greater intensity in the low areas. The weather thus becomes cold, although dry and sunny.
The progress of an anticyclonic circulation is called anticyclogenesis. The opposite process, instead, is called cyclogenesis (circulation is cyclonic in the atmosphere).
Sailing is one of the activities that is most affected by anticyclones, since they cause a shortage of wind and they force the navigators to move considerably away towards the north or the south, to take advantage of the direction of the wind, according to their destinations.
Between 30 and 35 degrees south and north latitude, which we could call the subtropical latitudes, it is normal to find anticyclones of apparent permanence in the same region. This is the part where the hadley cell, a Pattern atmospheric circulation that gives rise to easterly winds and trade winds in the tropics.
In fact, in the areas close to the equator, where the coriolis effect (which is observed when a body moves with respect to a reference system that is in full rotation), the air presents a direct circulation.
The heat is less in the lower levels of the atmosphere, and this characteristic of the temperature opens the doors to what is known as intertropical convergence zone, in which Archimedes’ principle (belongs to the field of physics, and proposes that a body at rest, totally or partially submerged in a fluid, undergoes a vertical thrust with a weight equal to the mass of the displacement, is i.e., of the dislodged volume of fluid) and the convergence (the collision of two horizontal airflows) are the causes of the uplift suffered by the warmer air.
South Atlantic Anticyclone
It is a subtropical area found in the southern Atlantic Ocean, and is also known as Santa Elena anticyclone. It is important to note that its position is not permanent, and neither is its intensity, but rather that in a zone Quite defined, an anticyclone usually appears in the meteorological charts used to describe the mean monthly pressure.
The approximate coordinates are 25 ° S 15 ° W, and there is usually a wide range of high atmospheric pressure. The two names that this anticyclone receives respond to its proximity to the saint helena island, the only space of land present in the vicinity, and the fact of being located in the ocean Atlantic.