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Download Atmosphere - Earth Systems A
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EARTH’S ATMOSPHERE Solar Radiation • Energy passed through electromagnetic radiation from the Sun Absorbed Solar Radiation • 51% absorbed by the Earth’s surface • 19% absorbed by the clouds and atmosphere Reflected Solar Radiation • 26% by the clouds and atmosphere • 4% by the Earth’s surface Critical Thinking Question • How would life on Earth be different if the atmosphere did not absorb or reflect any incoming radiation from the sun? Atmospheric Composition • Nitrogen 78 % • Oxygen 21% • Argon 0.5% • Carbon Dioxide 0.04% • Other 0.46% • Water vapor • Dust • Various other gases Atmospheric Conduction • The surface of Earth gets heated and air molecules get heated through conduction Atmospheric Convection • Hot air rises, cold air sinks and Creates wind patterns Air Pressure • The weight of air resting on Earth’s surface • 14.7 psi at sea level • Decreases with elevation Elevation • As you go up in elevation, gravity has less of a pull on the air molecules Water Content • Warm air holds more water than cold air Humidity • The amount of water vapor in the air Relative Humidity • A percentage of how much water vapor is in the air compared to how much water vapor air can hold Precipitation • Water vapor condenses in a cloud and falls because of gravity
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