Subscribe to our newsletter and never miss an important update!! Why the wind from equatorial low move towards polar high?? Usually wind flows from high pressure to low pressure. The hot air near the equator rises up and cools down when reaches a higher altitude. This cool air sinks down but due to the Coriolis effect, it turns to its right which will the towards the north in the northern hemisphere and towards the south in the southern hemisphere.
Where the subpolar low pressure belt is developed more regularly, is it southern hemisphere or northern hemisphere? A rising pressure indicates fine, settled weather, while a falling pressure indicates unstable and cloudy weather. Why is it so?? Can you please explain? The subsiding air at STHP is warm and dry. Is it warm and dry or cold and dry?
At one place, you have mentioned cold and dry and then in the next point, it is written warm and dry. Please explain? Yes, they are clones. The air majorly contains 72 percent nitrogen and 21 percent oxygen, in addition to a small amount of carbon dioxide, hydrogen, etc. Air has weight and thus, like liquids, it exerts pressure. A force is exerted by the atmospheric air on all objects in the atmosphere and on the earth.
The force or thrust exerted on a unit area by the atmospheric air is defined as atmospheric pressure. The standard atmospheric pressure is 0. This is a pressure equal to Pa. Equatorial low-pressure belt: This belt happens to be the zone of convergence of trade winds from two hemispheres from subtropical high-pressure belts. This belt is also called the Doldrums, because of the extremely calm air movements. The position of the belt varies with the apparent movement of the Sun.
As this region lies along the equator, it receives the highest amount of insolation. Due to intense heating, the air gets warmed up and rises over the equatorial region convection.
Whenever there is a vertically upward movement of air, the region at the surface will be at low pressure. Thus the belt along the equator is called the equatorial low-pressure belt.
As the larger part of the low-pressure belt passes along the oceans, the winds obtain a huge amount of moisture. Vertical winds convection carrying moisture from cumulonimbus clouds and lead to thunderstorms convectional rainfall. Seasonally the pressure belts change their position up to some extent. This area is thus an area of high pressure. It is also called the Horse latitude.
Winds always blow from high pressure to low pressure. So the winds from the subtropical region blow towards the Equator as Trade winds and another wind blow towards Sub-Polar Low-Pressure as Westerlies.
In this region, the air gets divided into two parts. One part blows towards the Equatorial Low-Pressure Belt. Centrifugal forces operating in this region create the low-pressure belt. The cold descending air gives rise to high pressures over the Poles. These areas of Polar high pressure are known as the Polar Highs. These regions are characterized by permanent Ice Caps.
The correct answer is 1. This belt is also called the Doldrums , because of the extremely calm air movements. Hence, statement 1 is correct.
It is the region of convergence of trade winds blowing equatorward from the sub-tropical belts of high pressure in the northern and southern hemispheres. Hence, statement 2 is correct and Statement 2 is the correct explanation of Statement 1. Subtropic High Pressure Belt is characterized by anti-cyclonic conditions ITCZ is known as the region of convergence near the equator because the winds flowing from subtropical high-pressure belts converge here The winds developed in Subtropical high-pressure are called westerlies Shrieking Sixties are the westerlies occurs in the Sub Polar Pressure Belts.
Option 3 is NOT correct. The ascending air of the equatorial region is deflected towards the poles due to the earth's rotation. After becoming cold and heavy, the air descends in these regions and gets piled up, which results in high pressure. This zone is characterized by anti-cyclonic conditions, which lead to atmospheric stability and aridity.
Wind in this zone is known as tropical easterlies i. The intertropical convergence zone ITCZ is known as the region of convergence near the equator because the winds flowing from subtropical high-pressure belts converge here.
This low-pressure belt is also known as doldrums because it is a zone of total calm without any winds. Due to high temperatures, a low-pressure belt is created in the equatorial region. This gives rise to air convergence in the area. Winds coming from the sub tropical and the polar high belts converge here to produce cyclonic storms or low-pressure conditions due to the formation of fronts.
This zone of convergence is also known as the polar front. The winds developed in this region are called westerlies. Answer Detailed Solution Below Option 1 : 1 and 2 only. The correct answer is 1 and 2 only. This belt happens to be the zone of convergence of trade winds from two hemispheres from subtropical high-pressure belts. Hence, statement 3 is incorrect. This belt is characterized by extremely low pressure with calm conditions. Hence, statement 2 is correct. This is because of the absence of Surface winds since winds approaching this belt to begin to rise near its margin.
Thus, only vertical currents are found. In spite of high temperatures, cyclones are not formed at the equator because of zero coriolis force.
The correct answer is A, B, C, D. Subtropical high-pressure belt : It extends from the tropics to about 35 0 latitudes in both the hemispheres. Winds coming from the subtropical and the polar high belts converge here to produce cyclonic storms or low-pressure conditions due to the formation of fronts. Answer Detailed Solution Below Option 2 : 25 - 35 degrees north and south of the equator. Key Points Horse latitudes: The horse latitudes are regions located at about 30 degrees north and south of the equator.
These latitudes are characterized by calm winds and little precipitation. The horse latitudes are located at about 30 degrees north and south of the equator. The subtropical high-pressure belts are a known region for spiritual peace and eternal calmness.
It is a much popular theory of the earlier times, th e Spanish transported horses by ship to their colonies in the West Indies and to America.
Hence, option 2 is the correct answer. This is where the northeast and the southeast trade winds converge. Polar high Equatorial low Sub-tropical high Sub-polar low. The correct answer is Subtropical high. After saturation complete loss of moisture at the ITCZ, the air moving away from the equatorial low-pressure belt in the upper troposphere becomes dry and cold.
So the high pressure along this belt is due to the 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. A calm condition anticyclonic with feeble winds is created in this high-pressure belt. The descending air currents feed the winds blowing towards adjoining low-pressure belts. This belt is frequently invaded by tropical and extra-tropical disturbances.
The North Pacific and North Atlantic are warm and the prevailing westerlies carry warmth to the adjacent land, particularly into Europe. Eastern coastal areas, on the other hand, have prevailing winds from the cold continental interiors and are much colder than at corresponding latitudes on western coasts. The warmest areas are the land masses of the southern hemisphere, particularly South Africa and Australia.
In July, the northern continents are strongly heated. Whilst equatorial regions receive the most solar radiation, they are somewhat cooler than the deserts of the sub-tropical, since considerable energy is consumed in evaporating the abundant moisture that precipitates there. Global yearly average temperatures are shown in Figure 9. Global average temperatures for January top and July bottom The highest rainfall totals occur near the equator; this is to be expected because the air here is rising, and being warm, is capable of storing considerable amounts of water vapour.
Most of the rainfall in the tropical belt is thus convective, with prolonged heavy showers and frequent thunderstorms. At very high latitudes, precipitation is low because air is too cold to contain much water vapour. The subtropical high pressure belts are regions of very low rainfall, due to stable atmospheric conditions associated with descending air. The northern temperate mid latitudes have moderate rainfall, much of it frontal in nature, which diminishes into the interiors of North America and Asia.
Rainfall, too, shifts with the north-south movement of the Sun and the seasons, particularly the equatorial rainbelt. Global yearly average is shown in Figure 9.
Global yearly average precipitation Questions. This is determined by the latitude. Areas in higher latitudes receive less solar radiation per unit area, and are therefore likely to be colder, particularly in winter, since seasonal differences are greater at this time.
The climate of a particular region will also be influenced by the effect of the global wind system and the distribution of land and sea in that area. Most solar radiation is received at the equator. Air here is heated by the surface and rises before dispersing north and south. Some of this air returns along the surface towards the equator, generating the trade winds, whilst the remainder moves poleward to meet the air blowing equatorward from the high latitudes.
The two air masses meet in the mid latitudes to generate the frontal systems, forcing the warm tropical air to rise. Because the Earth is rotating, the movement of air is deflected, to the right in the northern hemisphere, and to the left in the southern hemisphere. The resulting idealised atmospheric circulation is sketched in Figure 9. The centre of large continents such as Asia experience large ranges of temperature between summer and winter.
Nearer coastal regions the affect of the ocean modulates the seasonal changes in temperature. Here, the immense masses of rising air are cooled, generating large thunderstorms and frequent heavy downpours.
Nearly all of the rain in these regions is convective. Some areas may receive over mm inches in a year. In sub-tropical latitudes, particularly in Africa and Australia, the descending air prevents the occurrence of much precipitation.
Sometimes, droughts can last for several years and annual average rainfall is barely mm. Higher levels of precipitation occur in the mid-latitudes where frontal systems are generated. Although summertime rain in these areas can be convective, the majority of precipitation throughout the year is frontal in nature.
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