Why sub-tropical high pressure belt is frequently invaded by tropical and extra-tropical disturbances?
Answers
Since air has mass, it also has weight. The pressure of air at a given place is defined as a force exerted in all directions by virtue of the weight of all the air above it. Since air pressure is proportional to density as well as temperature, it follows that a change in either temperature or density will cause a corresponding change in the pressure. The following equation called ‘the gas law’, describes the relationship between pressure, temperature and density—
Pressure = Density x Temperature x Constant
According to the gas law, an increase in either density or temperature will cause an increase in pressure, provided the other variable (density or temperature) remains constant.
The atmosphere exerts a pressure of 1034 gm per square cm at sea level. This amount of pressure is exerted by the atmosphere at sea level on all animals, plants, rocks, etc.
2. Sub-Tropical High Pressure Belt or ‘Horse Latitudes’:
The sub-tropical highs extend from near the tropics to about 35°N and S. The high pressure along this belt is due to subsidence of air coming from the equatorial region which descends after becoming heavy. The high pressure is also due to the blocking effect of air at upper levels because of the Coriolis force. The subsiding air is warm and dry, therefore, most of the deserts are present along this belt, in both hemispheres.
The descending air currents feed the winds blowing towards adjoining low pressure belts. A calm condition with variable and feeble winds is created in these high pressure belts, called horse latitudes. In early days, the sailing vessels with a cargo of horses found it difficult to sail under such calm conditions. They used to throw horses into the sea when fodder ran out. This belt is frequently invaded by tropical and extra-tropical disturbances.
please mark it as brainlist please
I hope it is helpful to you