Deep waters sink into the deep ocean basins at high latitudes, where the temperatures are cold enough to cause the density to increase. the thermal equator).These flows are compensated at high levels by return flows aloft. The winds from the tropics converge at this low pressure zone. Adiabatic Chart: A thermodynamic diagram with temperature as abscissa and pressure as ordinate.. Advection: Transport of an atmospheric property solely by the mass motion of the atmosphere. The ocean currents may be classified based on their depth as, surface currents constitute about 10 per cent of all the water in the ocean, these waters are the upper. Consequently, the winds tend to descend over the north-western parts of India, resulting into the development of atmospheric stability and … This causes a very slight gradient and water tends to flow down the slope. Primary References: NCERT Geography,  Spectrum’s Geography [Amazon and Flipkart] and Savindra Singh [Amazon and Flipkart], Filed Under: Geography, Oceanography, Physical Geography. The air circulation over the oceans in the middle latitudes is mainly anticyclonic [Sub-tropical High Pressure Belt] (more pronounced in the southern hemisphere than in the northern hemisphere due to differences in the extent of landmass). 2 Year Validity == Validity of the Download links (both Static & Current Affairs) is 2 Years from the date of purchase. On an average, 4 to 6 cyclonic waves reach north-western India between October and April each year. Copyright © 2016-20 Pmfias.com. The shape and position of coasts play an important role in guiding the direction of currents. Class 11 Geography NCERT Solutions Chapter 10 Atmospheric Circulation and Weather Systems Class 11 Geography Chapter 10 NCERT Textbook Questions Solved 1. Global atmospheric circulation - Polar, Ferrel and Hadley cells The movement of air across the planet occurs in a specific pattern. a) 1 only b) 2, 4 and 5 only c) 2 and 4 only d) 3 and 5 only With the jet stream stalled the Sub-Tropical Jet was unable to transit across the Himalayas as it would do ordinarily, the monsoon cell to the south, fed by warmer waters in the Indian Ocean, had nowhere to go and as a consequence it deposited vast amounts of rain over Pakistan, Himalchal Pradesh and Jammu and Kashmir and this led to extensive flooding. 2) Canary Current is in the tropical latitudes, but it is a cold current. Global ... Synoptic covers 100s to 1000s of km2. In higher latitudes the temperature is near freezing i,e. However the environment far above us impacts their movement. Why? At higher latitudes, where the wind flow is mostly cyclonic [Sub-polar Low Pressure Belt], the oceanic circulation follows this pattern. ATMOSPHERIC CIRCULATION AND WEATHER SYSTEMS85 Horizontal Distribution of Pressure Small differences in pressure are highly significant in terms of the wind direction and purposes of comparison. On average, this circulation corresponds to large-scale wind systems arranged in several east–west belts that encircle the Earth. Answer The general circulation of the atmosphere also sets in motion the ocean water circulation which influences the earth’s climate. Because of Earth’s spin and the Coriolis Effect, winds of a low pressure system swirl counterclockwise north of the equator and clockwise south of the equator. ATMOSPHERIC PRESSURE Do you realise that our body is subjected to a lot of air pressure. The best app for CBSE students now provides Atmospheric Circulation and Weather System class 11 Notes Geography latest chapter wise notes for quick preparation of CBSE exams and school-based annual examinations. There is scarcely any cloud in the continuous blue sky. If the surface air pressure is 1,000 mb, the air pressure at 1 km above the surface will be: (a) 700 mb (b) 1,100 mb (c) 900 mb […] Question 1(i). The differences in atmospheric pressure causes the movement of air from high pressure to low pressure, setting the air in motion. Example: Grand Banks around Newfoundland, Canada and North-Eastern Coast of Japan. One branch is flows to the south of the Himalayas, while the second branch is positioned to the north of the Tibetan Plateau. It diverted the jet stream (meandering of Sub-Tropical Jet Stream) and its rain-giving train (trough) of summer storms farther north than usual, giving much of Southern European Russia drought conditions. The oceanic circulation pattern roughly corresponds to the earth’s atmospheric circulation pattern. Required fields are marked *, Copyright © 2016-20 Pmfias.com. The north atlantic drfit increases the temperature of the region by 5-10 degrees.]. The situation is reversed in the higher latitudes. Major hot deserts are located between 20-30 degree latitudes and on the western side of the continents. Copyright © 2016-20 Pmfias.com. They pile up warm waters in tropics and this warm water is the major force behind tropical cyclones. As one moves up the air gets varified and one feels breathless. The major hot deserts of the world are located on the western coasts of continents between latitudes 15° and 30°N. These areas lie in the western margins of the subtropical anti-cyclones. The air circulation over the oceans in the middle latitudes is mainly anticyclonic [Sub-tropical High Pressure Belt] (more pronounced in the southern hemisphere than in the northern hemisphere due to differences in the extent of landmass). 4. How does this happen? But in tropics cold current moves as sub surface current [cold water is denser than warm water] The STJ drives the temperate low pressures over Mediterranean Sea towards east across Afghanistan, Pakistan and reach north-west India. 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