Carbon dioxide is largely responsible for the greenhouse effect. 3. inflow of air at upper level of atmosphere. Very Nice article. We write simple, easy to understand articles, but always ensure high standards of quality. Based on the geographical location, the Cyclones are of two types namely Tropical Cyclones and Temperate Cyclones (Extra Tropical Cyclones). The environmental temperature decreases with increasing height of the atmosphere. The air you are breathing has weight, and although it … CO2 is not causing global warming! Sir,can we get topics separately or objective types…. Air pressure is measured with the help of a mercury barometer or the aneroid barometer. Find out the detailed information about how Air Pressure affects the weather, which is very useful for the competitive examinations like UPSC-prelims, SSC, State Services, NDA, CDS, and … Atmospheric pressure at sea level is about 101,000 Pa (101 kPa) but just 27,000 Pa (27 kPa) at the cruising altitude of a passenger plane. The rays of the sun fall directly o, Copyrights © 2020 All Rights Reserved by UPSC with Nikhil. Therefore this layer is called ‘changing sphere’ or troposphere. The air surrounding the earth is called the atmosphere. In this article, we are going to discuss in details about some of the topics like insolation, terrestrial radiation, heat budget of the earth, albedo, etc. (See Major Ocean Currents: How to learn faster?) The relative humidity of an air water mixture is defined as the ratio of the partial pressure of water vapour in the mixture to the equilibrium vapour pressure of water over a flat surface of pure water at a given temperature.It is normally expressed as a percentage. One millibar is defined as 1000 dynes per square centimeter (1 dyne is the force required to accelerate 1 gram of a mass 1 centimeter per second per second). Frictional Force – It affects the speed of the wind. TROPICAL CYCLONES Tropical Cyclones are violent storms that originate over the seas in the Low pressure belt of the tropical areas and move … The upper limit of the mesosphere is known as mesopause. sir please make available pdf of these notes i really want these notes in pdf kindly help me these notes are very useful plzz make me avilable them, Your email address will not be published. We write simple, easy to understand articles, but always ensure high standards of quality. I am very thankful to clearIAS team, as they provides us the useful info. form the remaining part of the atmosphere. It is measured in force per unit area. In this layer, the temperature starts decreasing with increasing altitude and reaches up to – 100 degree Celsius at the height of 80 km. The air is one among the necessary conditions for the existence of life on this planet. The atmosphere is a mixture of different gases. The air temperature at the tropopause is about – 80 degree Celsius over the equator and about – 45 degree Celsius over the poles. It is the lowermost layer of the atmosphere. Therefore, if the surface Atmospheric Pressure at any place is 1,000 mb, then the Pressure at 1 km above the surface will be (1000 – 100) mb i.e. 1. The distribution of atmospheric pressure across the latitudes is termed global horizontal distribution of pressure. The height of this layer is about 18 km on the equator and 8 km on the poles. Evaporation takes place in the oceans, seas, rivers, ponds and lakes while transpiration takes place from the plants, trees and living beings. 3. Atmospheric pressure: The air exerts pressure on earth’s surface by virtue of its weight. This is very important from UPSC point of view. It acts as a filter and absorbs the ultra-violet rays radiating from the sun and prevents them from reaching the surface of the earth. Higher percentage indicates that the air-water mixture is more humid. The winds in the upper atmosphere, 2 – 3 km above the surface, are free from frictional effect of the surface and are controlled by the pressure gradient and the Coriolis force. a. i … Try ClearIAS Mock Exams App. Dust particles are generally found in the lower layers of the atmosphere. The portion of the gases changes in the higher layers of the atmosphere in such a way that oxygen will be almost negligible quantity at the heights of 120 km. Carbon dioxide is meteorologically a very important gas. An atmosphere (atm) is a unit of measurement equal to the average air pressure at sea level at a temperature of 15 degrees Celsius (59 degrees Fahrenheit). The gravitational attraction* between the earth and air molecules is greater for those molecules nearer to earth than those further away — they have more weight — dragging them closer together and increasing the pressure (force per unit area) between them. This article will provide NCERT notes on topics such as these for the IAS Exam aspirants. CO2 is a poor greenhouse gas. The thickness of the troposphere is greatest at the equator because heat us transported to great heights by strong convectional currents. Use Special Code “AJITLIVE” to get 10% discount on your Unacademy Subscription. The atmosphere is made up of different gases, water vapour and dust particles. Despite high vertical pressure gradient, there is weak upward wind because the pressure gradient gets weakened by the Gravitational force. Yes, I want ClearIAS to help me score high! Water vapour absorbs part of the incoming solar radiation (insolation) from the sun and preserves the earth’s radiated heat. Vertically, atmospheric pressure is highest at sea level, it is about 1013.2 Mb, atmospheric pressure gets decreases with altitude. The atmosphere is a mixture of different gases. The pressure exerted by air on the surface of the earth is called as atmospheric pressure. Atmospheric pressure. a) 1 and 2 only Hi Nikhil, thank you for the feedback and great to know that readers like you value our content so much. There are different types of movements of ocean water under the influence of different physical characteristics like temperature, salinity, density, etc. The air surrounding the earth is called the atmosphere. The air is a mixture of several gases and it encompasses the earth from all sides. Weather related incidents do not take place in this layer. The pressure decreases with height. ii) Air pressure at sea level is lower than at the mountain top. Therefore this layer is considered ideal for flying of aircraft. ClearIAS Team has been receiving a lot of support and encouragement from our loving readers for our easy-to-understand articles on Geography. We all know that earth is a unique planet due to the presence of life. Pressure Gradient Force – The differences in atmospheric pressure produces a force. For cracking the IAS. At sea level the average atmospheric pressure is 1,013.2 milibar. Atmospheric pressure is the weight of a column of air contained in a unit area from the mean sea level to the top of the atmosphere. And prevents them from reaching the surface which causes the differential air volumes mb or 1,013.2 mb 1,013.2! Largely responsible for the survival of plant and animal life for candidates, as this is unique... 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