Earth: An Introduction to Physical Geology (12th Edition)

Published by Pearson
ISBN 10: 0134074254
ISBN 13: 978-0-13407-425-2

Chapter 21 - Section 21.4 - Heating the Atmosphere - Concept Checks - Page 644: 3

Answer

Sketches will vary based on each student

Work Step by Step

Start by visualizing the Earth at the bottom of your sketch, surrounded by a thin layer representing the atmosphere. From the top of the page, imagine lines coming down towards Earth, symbolizing the sunlight. These can be labeled as 'Incoming Solar Radiation'. Some of this sunlight, which is primarily shortwave radiation, will pass through the atmosphere without much interference, touching the Earth's surface directly. As the Earth absorbs this energy, it heats up and emits energy back into space. Illustrate this using arrows emerging from Earth, moving upwards, labeled 'Outgoing Longwave Radiation.' Within the atmospheric layer around Earth, introduce small representative molecules or circles to signify 'Greenhouse Gases.' It's worth noting that these can represent common greenhouse gases like carbon dioxide (CO2), methane (CH4), and water vapor (H2O). A significant aspect of the greenhouse effect is depicted when some of the outgoing longwave radiation bounces off these greenhouse gas molecules and is redirected back toward Earth. This represents the heat that is trapped by the greenhouse gases, a phenomenon which can be labeled 'Trapped Heat' or 'Radiative Forcing.' To emphasize Earth's warming, show some of this redirected radiation integrating back into the Earth, illustrating the heat that the planet retains.
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