The warm coil on the stove glows because it emits EM radiation and the coil’s heat is felt at a distance because of EM radiation. We feel the warmth from a fireplace even with a glass barrier because of EM radiation.
To understand the role of greenhouse gases in global climate change, it is important to understand the basics of blackbody radiation and the interaction of greenhouse gases with Earth’s long-wave radiation.Īll bodies emit energy in the form of electromagnetic (EM) radiation. The sun’s energy reaches Earth in the form of light – a form of EM radiation (Figure 1). Greenhouse effect: The process of energy absorption and re-radiation by the GHGs in the atmosphere.Greenhouse gas (GHG): A gas that absorbs energy in wavelengths corresponding to long-wave radiation.Anthropogenic emissions: Emissions resulting from human activities.Longwave radiation: Usually refers to the electromagnetic radiation in infrared and near-infrared wavelengths (longer than 4 mm) – i.e., wavelengths where most of Earth’s radiative energy is concentrated.Shortwave radiation: Usually refers to the electromagnetic radiation in near- visible and visible wavelengths (0.3 - 4 mm),– i.e., wavelengths where most of Sun’s energy is concentrated.EM radiation behaves both like a stream of massless particles and waves as it is transmitted through a medium. Electromagnetic (EM) radiation: Electromagnetic radiation is produced as a result of conversion of a body’s internal thermal energy to electromagnetic energy – i.e., energy associated with the motion of charged particles.Black body: A finite-sized body that absorbs all incident electromagnetic radiation.Students will use a variety of web based visualization tools and Excel to plot data obtained from these tools. Students will be able to recognize different greenhouse gases and the mechanism by which they interaction with terrestrial radiation. Students will be able to understand terminology related to solar and terrestrial radiation. Rationale: This unit helps students understand the basics of the greenhouse effect and the relationship between greenhouse gas concentrations and global temperatures. Communicate their findings orally using appropriate climate change and Earth science vocabulary.Relate greenhouse gas concentrations to temperature.Recognize that different gases interact with radiation of different wavelengths differently.
Associate temperatures of objects with their electromagnetic emission wavelengths.Identify the important wavelength spectrums associated with solar and terrestrial radiation.Learning Goals: After completing this unit, users will be able to: Grade Level: High school, but could be adapted to 8th grade. Early College Program: The Clarkson School.International Admissions, Undergraduate.
Institute for a Sustainable Environment.Beacon Institute for Rivers and Estuaries.
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