Consequently, winds blow from high pressure belts to low pressure belts. See more. In a continuous 1,800 â¦ The illustration below portrays the global wind belts, three in each hemisphere. Philosoraptor. Slow-moving oceanic Rossby waves are are fundamentally different from ocean surface waves. Plagiarism Prevention 5. Feedback from star-formation, in the form of supernova explosions of massive stars, stellar winds or ultraviolet radiation from massive stars, or outflows from low-mass stars may disrupt the cloud, destroying the nebula after several million years. The winds blowing almost in the same direction throughout the year are called prevailing or permanent winds. On the other hand, the equator-ward parts of the trade winds are humid because they are characterized by atmospheric instability and much precipitation as the trade winds while blowing over the oceans pick up moisture. Planetary winds are also known as permanent or prevailing winds Winds blowing from subtropical high pressure area to equatorial low pressure area (Extremely steady winds), Since they travel from high latitude to low latitude area, they become gradually hot & dry and hence have a great capacity to hold moisture, They cause considerable rainfall on eastern margins of the continents as they get moisture after blowing over oceans, These winds converge near equator & form ITCZ, Here these winds rises & causes heavy rainfall, Winds blowing from subtropical high pressure belts towards subtropical low pressure belts, Blow from S – W to N – E under Coriolis effect in N – Hemisphere & from N – W to S – E in S – Hemisphere, Blow from lower latitudes to higher latitudes, Cause considerable rainfall particularly on western margins of the continents, More consistent in direction & blow with stronger force in S – Hemisphere due to lesser obstructions from continents. DIRECT DOWNLOAD! c. rotation. Generally, the areas extending between 30°N and 30°S latitudes are included in tropical zone. Asia and southern USA) the trade winds disappear during summer season due to formation of low pressure cells because of high temperature but the trade winds are more constant and regular over the continents during winter season. Simple theme. Planetary winds pdf Hot air rises.draw diagram showing pressure belts and planetary winds. The equatorial or tropical fronts are called intertropical fronts (ITF) or intertropical convergence (ITC). This belt of calm is very popularly known as horse latitudes because of the fact that in ancient times the merchants had to throw away some of the horses being carried in the ships in-order to lessen the weight so that the ships could be sailed through the calm conditions of these latitudes. This type of gas loss from a planet into space is known as planetary wind. Their velocity increases southward and they become stormy. Other articles where Planetary wind system is discussed: Pacific Ocean: Climate: â¦Pacific conform closely to the planetary systemâthe patterns of air pressure and the consequent wind patterns that develop in the atmosphere of the Earth as a result of its rotation (Coriolis force) and the inclination of its axis (ecliptic) toward the Sun. New discoveries have now put question marks against the views of zonal character and regularity of surface trade winds, uniformity of weather conditions in the tropics, and upper air antitrade winds. Thus, such winds are called permanent winds. This belt is called the belt of calm or doldrum because of light and variable winds. THE ANTARCTIC PLATEAU: TYPE EXAMPLE OF A PLANETARY WIND DOMINATED LANDSCAPE. 1 Answer. Thus, winds blow from polar high pressure to sub-polar low pressure cells. On an averages, the location of high and low pressure belts is considered to be stationary on the globe (though they are seldom stationary). It may be stated that the trade winds are more regular and constant over the oceans than over the lands. (3) Western Coastal Margin of Central America. This is why the anticyclonic conditions cause atmospheric stability, dry condition and very weak air circulation. How to use planetary wind in a sentence. The velocity of the westerlies becomes so great that they are called roaring forties between the latitudes of 40°-50° S, furious fifties at 50°S latitude and shrieckng sixties at 60° S latitude. NASA's QuikSCAT satellite carries the SeaWinds instrument, a scatterometer.A scatterometer is a microwave instrument that measures the microwaves reflected or scattered back to the instrument from the sea surface. The dynamically induced (due to subsidence of air currents) subtropical high pressure belt extends between 30°-35° (25°-35°) latitudes in both the hemispheres. The Earth's atmospheric circulation varies from year to year, but the large-scale structure of its circulation remains fairly constant. On Earth, winds get faster as you get higher in the atmosphere. There is much variation in the weather conditions in their poleward parts where there is convergence of cold and denser polar winds and warms and lighter westerlies. Giving examples, highlight the role of local winds in influencing climate, agriculture and livelihood in various regions. This Blog consists of data, information, paragraph,direct writings of geography stuffs collected from various sources. Add your answer and earn points. to S.E in the southern hemisphere. Astronomers have presented an explanation for the shapes of planetary nebulae. The westerlies become more vigorous in the southern hemisphere because of lack of land and dominance of oceans. These westerly winds have been called by Flohn as equatorial westerlies (fig. The SeaWinds scatterometer is a specialized microwave instrument that measures near-surface wind speed and direction all the time, even when it is cloudy. On an average, there is westerly air circulation (form west to east) in the doldrums or say in the intertropical convergence. Content Guidelines 2. Powered by, https://www.affairscloud.com/assets/uploads/2016/04/wind.png, Planetary Winds: Their Types and Definition. The winds regularly blow throughout the year confined within latitudinal belts, mainly in north-east and south-east directions or from high-pressure polar-regions to low-pressure regions. Convergent wind zones are where planetary wind belts meet. The planetary wind is of three types such as : the trade wind, the westerlies and the polar wind. Astronomers present an explanation for the mesmerizing shapes of planetary nebulae. The weather conditions in the tropics are not calm and uniform but they are frequently interrupted by atmospheric disturbances (cyclones, hurricanes, typhoons, sea waves etc.). Also known as brave winds or roaring forties, furious fifties & shrieking sixties according to the varying degree of storminess in the latitudes in which they blow. Each of these wind belts represents a "cell" that circulates air through the atmosphere from the surface to high altitudes and back again. Trade wind definition, any of the nearly constant easterly winds that dominate most of the tropics and subtropics throughout the world, blowing mainly from the northeast in the Northern Hemisphere, and from the southeast in the Southern Hemisphere. In this article we will discuss about the classification of planetary winds. Other examples of periodic winds include land and sea breeze, mountain and valley breeze, cyclones and anticyclones, and air masses. These winds are called trade winds because of the fact that they helped the sea merchants in sailing their ships as their (of trade winds) direction remains more or less constant and regular. The poleward parts of the trade winds or eastern sides of the subtropical anticyclones are dry because of strong subsidence of air currents from above. Copyright 9. Report a Violation 10. Global winds or Planetary winds are large body air masses created mainly as a result of the earths rotation, the shape of the earth and the suns heating power. Trade winds blow in a belt lying between 5°N-30°N in the northern hemisphere and 5°S-30°S in the southern hemisphere. There is very high pressure over the poles because of exceedingly low temperature. Planetary winds produce surface ocean currents. The western parts of subtropical anticyclones (covering the eastern parts of the continents and western parts of the oceans) are humid because some sort of atmospheric instability is caused due to weakening of air descent (e.g., in the areas of Caribbean Sea, Mexican Gulf and adjoining areas, eastern China, southern Japan, south-east Brazil and eastern Australia). These anticyclones are known as ‘subtropical highs’ or subtropical anticyclones, the eastern and western parts of which are characterized by contrasting weather conditions. The discovery is based on an extraordinary set of observations of stellar winds around aging stars. These cyclones move along with the westerlies in easterly direction. These views of weather conditions prevailing in the tropics are now considered as old concepts and have now been refuted on the basis of new information based on numerous observations made in the upper air and near the earth’s surface during and after Second World War. The wind responds by seeking a return to a "balanced" atmosphere and changes speed and/or direction. The zone of polar winds shrinks due to northward shifting of pressure belts at the time of northern summer (summer solstice) in the northern hemisphere but it is extended up to 60°N latitude during northern winter (winter solstice). The weather conditions throughout the tropical zone remain more or less uniform. There are much variations in the weather conditions in the different parts of trade winds. The wind belts are basically controlled by the latitudinal pressure belts and by the forces produced by rotation of the earth. According to Ferrel’s law (based on coriolis force generated by the rotation of the earth) trade winds are deflected to the right in the northern hemisphere and to the left in the southern hemisphere. These winds include trade winds, westerlies and polar winds (fig. 35.7). It was believed that doldrum is a regular feature all along the equator and is characterized by strong convective instability leading to the formation of cumulonimbus clouds and copious rainfall daily but the recent observations have now shown that the belt of doldrum is not continuous but is confined to certain localities only. The north-east and south-east trades converge along the equator and there are upper air antitrades blowing in the opposite directions of the surface trade winds. It is also apparent that the subtropical high pressure belt is the source for the origin of trade winds (blowing towards equatorial low pressure belt) and westerlies (blowing towards sub-polar low pressure belt) because winds always blow from high pressure to low pressure. Spanning somewhat smaller, yet large distances of a few hundred to several thousand kilometers, are synoptic scale weather systems. Itâs an amazing contradiction.â And thatâs not the only mystery blowing in the planetary wind. Global winds are caused by the combination of pressure belts and the Coriolis effect. 9 years ago. Uploader Agreement, Seasonal Shifting of Wind Belts | Climatology | Geography, Classification of Pressure Belts: 4 Categories | Climatology | Geography, Factors Affecting Wind Motion and Classification of Winds, Tri-Cellular Meridional Circulation of the Atmosphere | Climatology | Geography, Temperature of Oceanic Water | Oceans | Geography, International Tourism in India: Introduction, History, Trends, Opportunities and Future, Forestry: Definition, Branches, Costs, Programme and Conclusion | Geography, Contribution of Russia to World Geography (In Hindi), French Scholars and their Contribution to Geography in Hindi. Because of the dominance of land in the northern hemisphere the westerlies become more complex and complicated and become less effective during summer seasons and more vigorous during winter season. These fronts represent the meeting ground of north-east and south-east trade winds. It may be pointed out that the zone of trade winds is called Hadely Cell on the basis of the convective model prepared by Hadley for the entire earth. There is more or less regular inflow of winds from subtropical high pressure belts to equatorial low pressure belt. c. rotation on its axis. i tried to assemble geography contents for my academic purposes.Geography students might find it handy and may use as hand note. Planetary winds: The general distribution of winds throughout the lower atmosphere is known as planetary winds. These winds blow over the vast area of the continents and oceans. b. seasonal changes. According to Flohn the equatorial westerlies cover the areas extending from the western parts of Africa across the Indian Ocean to the western Pacific Ocean. 35.10). The air after being heated near the equator ascends and after blowing in opposite direction to the surface trade winds descends in the latitudinal zone of 30°-35°. The northern and southern boundaries of intertropical convergence are called north intertropical convergence (NITC) and south intertropical convergence (SITC) respectively (fig. Sahara and Kalahari in Africa, Chile-Peru desert or Acatama in South America, Arabian and Thar deserts in Asia, deserts of S. W. USA, and Australian deserts). Such phenomena are typically a few thousand kilometres in size and have lifetimes ranging from several days to several weeks. This video explains Planetary Winds namely Trade Winds, Westerlies and Polar Easterlies and cells for wind movement namely, Hadley Cell, Ferrel Cell and Polar Cell. 35.10) which cover 200° longitudes. The wind, moving in one general direction, pushes the ocean water to produce these currents (see Ocean Surface Currents chart). 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