Part One Climate Change 1 Syllabus 1.0 - Introduction 2.0 - The Earth's Natural Greenhouse Effect 3.0 - The Greenhouse Gases 4.0 - CO 2 Emissions 5.0 - The Earth's Carbon Reservoirs 6.0 - Carbon Cycling: Some Examples 7.0 - Climate and Weather 8.0 - Global Wind Systems 9.0 - Clouds, Storms and Climates 4. Tropical humid climates exist between Tropic of Cancer and Tropic of Capricorn. Precipitation occurs throughout the year. Age is also associated with views of climate change in some countries. %PDF-1.5 The annual precipitation is low from 12-15 cm. 2 0 obj Barring action on a sweeping scale, the report said, climate change will accelerate the danger of severe food shortages. The seasons of dryness are indicated by the small letters : f, m, w and s, where f corresponds to no dry season, Table 12.1: Climate Groups According to Koeppen. 5. The causes for climate change are many. Although developed in 1918 and modified over a period of time, Koeppen’s scheme is still popular and in use. Chlorofluorocarbons (CFCs) are products of human activity. ‘ This is the region of permafrost where the sub soil is permanently frozen. The most important anthropogenic effect on the climate is the increasing trend in concentration of greenhouse gases in the atmosphere which is likely to cause global warming. Dry Climates: B Dry climates are characterized by very low rainfall that is not adequate for the growth of plants. D. An another astronomical theory is Millankovitch oscillations, which infer cycles in the variations in the earth’s orbital characteristics around the sun, the wobbling of the earth and the changes in the earth’s axial tilt. 1. They are grouped into four types: (i) Humid subtropical, i.e. The annual and diurnal ranges of temperature are also high. They can be grouped into Astronomical 2.Terrestrial causes. The world wasn’t ready for COVID-19. February 27, 2019 When most people think about the effects of climate change, they envisage the polar caps melting. Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. Hence, the climate is characterised by hot, dry summer and mild, rainy winter. In the U.S., 71% of those ages 18 to 29 say climate change is a threat, compared with half of Americans 50 and older. The greatest warming of the 20th century was during the two periods, 1901 -44 and 1977-99. Precipitation types and intensity also vary spatially across high lands. The glass, therefore, allows in more radiation and prevents the long wave radiation going outside the glass house, causing the temperature inside the glasshouse structure warmer than outside. The weather changes are abrupt and short. Climate change, on the other hand, occurs because the amount of energy in the entire climate system is changed which affects each and every component in the system. Kyoto protocol bounds the 35 industrialized countries to reduce their emissions by the year 2012 to 5 per cent less than the levels prevalent in the year 1990. Rain occurs in short intense thundershowers in deserts and is ineffective in building soil moisture. The most widely used classification of climate is the empirical climate classification scheme developed by V. Koeppen. 2. Ozone which absorbs ultra violet radiation in the stratosphere is very effective in absorbing terrestrial radiation when it is present in the lower troposphere. These areas come under the influence of sub tropical high in summer and westerly wind in winter. E. All these alter the amount of insolation received from the sun, which in turn, might have a bearing on the climate. Download revision notes for World Climate and Climate Change class 11 Notes Geography and score high in exams. A greenhouse is made up of glass. He introduced the use of capital and small letters to designate climatic groups and types. The worst devastating drought in the Sahel region, south of the Sahara desert, from 1967-1977is one such variability. stream After 1940, the rate of increase in temperature slowed down. The world cannot afford that. The increasing trend in the concentration of GHGs in the atmosphere may, in the long run, warm up the earth. On the western margin of the continents, adjoining the cold current, particularly over the west coast of SouthX America, they extend more equator wards and occur on the coast land. Over each of these two periods, global temperatures rose by about 0.4°C. The capital letters: A, C, D and E delineate humid climates and B dry climates. According to some meteorologists, when the number of sunspots increase, cooler and wetter weather and greater storminess occur. The temperature is uniformly high and the annual range of temperature is negligible. During the 1930s, severe drought occurred in southwestern Great Plains of the United States, described as the dust bowl. 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