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Earth's Albedo
http://www.andrill.org/education/elf_activities_1D.html

Environmental Literacy Framework, ANDRILL

This engaging activity introduces students to the concept of albedo and how albedo relates to Earth's energy balance.

The activity takes about two class periods.

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Learn more about Teaching Climate Literacy and Energy Awareness»

Climate Literacy
About Teaching Climate Literacy

When Earth emits the same amount of energy as it absorbs, its energy budget is in balance, and its average temperature remains stable.
About Teaching Principle 1
Other materials addressing 1b
Sunlight reaching the Earth can heat the land, ocean, and atmosphere. Some of that sunlight is reflected back to space by the surface, clouds, or ice. Much of the sunlight that reaches Earth is absorbed and warms the planet.
About Teaching Principle 1
Other materials addressing 1a
The interconnectedness of Earth’s systems means that a significant change in any one component of the climate system can influence the equilibrium of the entire Earth system. Positive feedback loops can amplify these effects and trigger abrupt changes in the climate system. These complex interactions may result in climate change that is more rapid and on a larger scale than projected by current climate models.
About Teaching Principle 2
Other materials addressing 2f

Excellence in Environmental Education Guidelines

2. Knowledge of Environmental Processes and Systems:2.1 The Earth as a Physical System:A) Processes that shape the Earth
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A) Processes that shape the Earth.
2. Knowledge of Environmental Processes and Systems:2.1 The Earth as a Physical System:C) Energy
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C) Energy.

Benchmarks for Science Literacy
Learn more about the Benchmarks

Light and other electromagnetic waves can warm objects. How much an object's temperature increases depends on how intense the light striking its surface is, how long the light shines on the object, and how much of the light is absorbed.
Explore the map of concepts related to this benchmark

Notes From Our Reviewers The CLEAN collection is hand-picked and rigorously reviewed for scientific accuracy and classroom effectiveness. Read what our review team had to say about this resource below or learn more about how CLEAN reviews teaching materials
Teaching Tips | Science | Pedagogy | Technical Details

Teaching Tips

  • Positive and negative aspects of the model should be discussed beforehand with students. In particular, what do the popcorn kernels represent? Why are there 100 of them per trial? The text says "energy packets," which isn't concrete enough for students to grasp. In fact, each kernel represents 1% (which is why there are 100 kernels) of incoming solar radiation that will be reflected and absorbed by each type of land surface. How many kernels fall on each type of surface depends on its extent (area). Teachers might ask students to predict which land surface type they think will have the most corn kernels landing on it? Which will have the fewest?
  • Have maps and containers with 100 popcorn kernels prepared before students do the activity. Explain to students what the kernels represent.

About the Science

  • Earth's Albedo is Earth's reflectivity of solar radiation by a given surface. This albedo is different over the ocean versus over snow and vegetation. The activity uses a very simple model for students to explore how the albedo of different land surfaces affects Earth's energy balance and climate change.
  • Students use a world map of global biomes and energy packets represented by popcorn kernels to explore and calculate the average yearly percentage of absorbed and reflected energy. Then they predict what will happen as Earth's snow and ice cover decrease due to climate change.
  • In this activity, students predict how climate change is influencing the amount of snow and ice cover, which may change Earth's albedo.
  • Comments from expert scientist: This activity tries to explain the concept of Earth's albedo in a very simplified manner using easily available materials like popcorn kernels, world map (which is given in the activity material), etc. This interesting way makes this concept easy to grasp by the young learners.

About the Pedagogy

  • The lesson is a good example of active learning–students take data, do some simple calculations, and compute the differences between the amount of energy reflected and absorbed by different types of biomes.
  • The results of the investigation are striking and easy for students to understand. The activity will lead students to construct from their data their own ideas and conclusions about the role of ice and oceans in climate change instead of learning about these concepts from a lecture or reading.

Technical Details/Ease of Use

  • The student handouts are attractive and written at an appropriate level for 6 -12 grade students. A PowerPoint presentation with good images and text is provided. A modest amount of background information and a glossary are provided for both teachers and students.

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