A. The cold front moves faster than the warm front ultimately overtaking the warm front. Table 10.1 gives the average pressure and temperature at selected levels of elevation for a standard atmosphere. Why Studyadda? | The easterlies from either side of the equator converge in the Inter Tropical Convergence Zone (ITCZ). Thus, the horizontal winds near the earth surface respond to the combined effect of three forces - the pressure gradient force, the frictional force and the Carioles force. General Atmospheric Circulation and its Effects on Oceans. Later, downdraft brings down to earth the cool air and the rain. The force exerted by the rotation of the earth is known as the Carioles force. प्रश्न=13. atmospheric circulation and weather system notes, atmospheric circulation and weather system upsc, Specific Children Identification ( विशिष्ट बालकों की पहचान व शिक्षा ), Communication Processes and Skills Question ( संप्रेषण प्रक्रिया एवं कौशल ), Psychology Introduction ( मनोविज्ञान का परिचय ), Personal Variation ( व्यक्तिगत विभिन्नता ), Education Psychology Question Quiz 1 ( शिक्षा मनोविज्ञान ), Computer Terminology ( कंप्यूटर शब्दावली ). In the lower atmosphere the pressure decreases rapidly with height. 2. Other severe local storms are thunderstorms and tornadoes. This wind is known as the valley breeze. In the night the reversal of condition takes place. The air in motion is called wind. These three cells set the pattern for the general circulation of the atmosphere. The sea level pressure distribution is shown on weather maps. It is maximum at the poles and is absent at the equator. | Without any further due, let’s begin: 1. | The air with distinctive characteristics in terms of temperature and humidity is called an air mass. Figure 10.6: Simplified general circulation of the atmosphere. The general circulation of the atmosphere also sets in motion the ocean water circulation which influences the earth's climate. (ii) Draw a simplified diagram to show the general circulation of the atmosphere over the globe. A. EOSN C. हेडले कोष्ठ ✅ (i) Discuss the factors affecting the speed and direction of wind. B. D. दक्कन पठार, प्रश्न=13. Tornadoes generally occur in middle latitudes. A thunderstorm is a well-grown cumulonimbus cloud producing thunder and lightening. The vertical rising of moist air cools it down to form the clouds and bring precipitation. वायु दाब को मापने की इकाई को कहा जाता है? Franchise CONCISE NOTES ON MODERN INDIAN HISTORY: https://imojo.in/2gi37hn 2. Atmospheric pressure also determines when the air will rise or sink. Due to gravity the air at the surface is denser and hence has higher pressure. Test for Geography for UPSC (Civil Services) Prelims Atmospheric Circulation and Weather Systems. There are five major source regions. This results in variations in the atmospheric pressure. The widely used unit is kilo Pascal written as hPa. Initially, the front is stationary. Thunderstorms are caused by intense convection on moist hot days. Around the eye is the eye wall, where there is a strong spiraling ascent of air to greater height reaching the tropopause. (iii) Why does tropical cyclone originate over the seas? (i) Discuss the factors affecting the speed. Around a high it is called anti cyclonic circulation. (अ) विषुवत वृत्त के निकट वायुदाब कम होता है और इसे विश्व वित्तीय निम्न दाब क्षेत्र के नाम से जाना जाता है The large-scale winds of the atmosphere initiate large and slow moving currents of the ocean. | (ii) The Inter Tropical Convergence Zone normally occurs: (iii) The direction of wind around a low pressure in northern hemisphere is: (iv) Which one of the following is the source region for the formation of air masses? The low pressure gets filled instead of getting intensified. | (स) कोरियॉलिस बल ✅ Isobars are lines connecting places having equal pressure. A. This chapter has been devoted to explain the causes of pressure differences, the forces that control the atmospheric circulation, the turbulent pattern of wind, the formation of air masses, the disturbed weather when air masses interact with each other and the phenomenon of violent tropical storms. पृथ्वी के घूर्णन द्वारा लगने वाले बल को कॉरिओलिस बल कहते हैं, 4. 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