ENV100Y5 Lecture Notes - Lecture 44: Experimental Lakes Area, Soot, Nimbus Program
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ENV100Y5 Full Course Notes
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Env100y5- lecture 44- air pollution & stratospheric ozone depletion. Affects climate and harms people and ecosystems. Air pollutants: gases and particulate material added to the atmosphere. Outdoor (ambient) air pollution: has decreased in recent decades due to the government policy and improved technologies in developed countries, developing countries and urban areas still have significant problems. Dust storms: 100s of millions of tonnes of dust are blown westward across the atlantic ocean by trade winds every year and across the pacific ocean by jet stream. Waves breaking: major sources of salt moving from ocean to land-based reservoirs. Fires: fires are made more severe by human action, decades of fire suppression. Volcanic eruptions: large quantities of particulate matter (ash), aerosols, sulphur dioxide etc, can remain in the atmosphere for months or years, aerosols= reflect sunlight back into space and cool the atmosphere and surface, aerosols enhance cloud formation. Primary pollutants: directly harmful and/or react to form harmful substances (e. g. soot; carbon dioxide)
