What is anticyclone?

Anticyclon is an area of ​​high atmospheric pressure, with winds flowing out of the center. Due to the rotation of Coriolis Earth, the effect is diverted by winds, causing it to rotate clockwise in the northern hemisphere and counterclockwise in the south. When the air moves away from the center, it is attracted more from above, so the anticyclones are associated with the downward air. The term is the opposite of the cyclone, which means the area of ​​low pressure into which air flows from areas with higher pressure. Anticyclones and high pressure in general are usually associated with dry weather and light wind, and therefore the household barometers will indicate "fine" weather when the pressure is high.

In general, anticyclon has roughly a circular shape. Air pressure changes are listed on meteorological maps and graphs using isobars: a line connecting points of the same pressure. Anticyclones can be considered as sets of concentric, approximately circular isobars with pressure to the center. Prolonged high -pressure areas may occur; They are knownMy as high -pressure combs.

anticyclonic conditions are predominant in subtropical areas, resulting from global atmospheric circulatory formulas. The humid air near the equator is heated and rises, spreads north and south and decreases in latitudes about 30 degrees north and south of the equator and forms large anticyclones. This type of high -pressure area is known as subtropical anticyclon. Since most of the humidity was precipitated from the air in the lower latitudes, the descending air is very dry, and therefore the subtropical areas tend to be dry; In fact, most of the world's deserts are in these regions.

These large anticyclones are more or less permanent feature of the Earth's climate. In the subtropical regich there are several different semi-inflated high-pressure systems named names such as Bermuda-Azores High and Pacific High. Although semi -resistant, afterThey make seasonal movement. For example, Bermuda-Azores is usually concentrated from the southeast coast of North America in the summer, but during the autumn and winter it moves east to settle over the middle Atlantic. Smaller, more transient anticyclones can form above mild areas, usually bring warm, sunny weather during the summer and cold, clear weather during the winter.

anticyclones also form over the poles by cooling air near the surface. The cold, thick air flows out to be replaced by air from above, resulting in a typical anticyclonic formula of descending air flowing out of the high -pressure center. These anticyclones are the strongest during the winter months, with the Siberian high produces some of the highest values ​​of barometric pressure on the planet.

The main high-pressure systems such as Bermuda-Azores High and Pacific High have a great impact on the climate of the surrounding areas. Although the anticyclones themselves are associated with calm, dry conditions, they can into neighboring areasBring storms and wet weather. For example, during the summer months, the winds from Bermuda-Azores bring high humid air from the Atlantic to the southeastern United States, resulting in a high collision. This high -pressure system also has a major impact on the paths of hurricanes.

In mild areas, anticyclones are associated with good weather - a dry, sunny condition - but they can also have adverse effects. The persistent anticyclon can delay or prevent seasonal clotting and bring drought to areas depending on this collision for agriculture. Anticyclonic conditions may also worsen air pollution in urban areas where descending air and light winds slow down the variance of pollutants.