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Global Ocean Conveyor Belt
http://www.andrill.org/education/elf_activities_3A.html

Environmental Literacy Framework, ANDRILL

This hands-on activity explores the driving forces behind global thermohaline circulation.

This activity takes about one to two 50-minute class periods (one period is stated but when providing the context it will likely take two periods).

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Climate Literacy
About Teaching Climate Literacy

Covering 70% of Earth's surface, the ocean exerts a major control on climate by dominating Earth's energy and water cycles. It has the capacity to absorb large amounts of solar energy. Heat and water vapor are redistributed globally through density-driven ocean currents and atmospheric circulation. Changes in ocean circulation caused by tectonic movements or large influxes of fresh water from melting polar ice can lead to significant and even abrupt changes in climate, both locally and on global scales.
About Teaching Principle 2
Other materials addressing 2b

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
Other materials addressing:
A) Processes that shape the Earth.

Benchmarks for Science Literacy
Learn more about the Benchmarks

Transfer of thermal energy between the atmosphere and the land or oceans produces temperature gradients in the atmosphere and the oceans. Regions at different temperatures rise or sink or mix, resulting in winds and ocean currents. These winds and ocean currents, which are also affected by the earth's rotation and the shape of the land, carry thermal energy from warm to cool areas.
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

  • In order to effectively teach about the ocean conveyor belt, the PowerPoint presentation should be shown ahead of time so students are prepared for the content. Educator might want to have students think about ways in which they want to engage an audience in this material ahead of time - emphasizing how the ocean conveyor belt affects their own lives where they live.
  • Educator is encouraged to make the salty icebergs ahead of time. In some cases, using an submersible aquarium heater works well for an activity like this.
  • Assigning groups of students to experiment with different water mass scenarios works well - then have students present their results to their classmates before going to a wider audience.

About the Science

  • The ocean conveyor belt transports heat throughout Earth's oceans and controls Earth's climate patterns.
  • Explanations of the factors that drive thermohaline circulation – density gradients, surface air temperature, surface winds, ocean temperature variations, fresh water fluxes etc. – are very simplified and only briefly explained. For an in-depth understanding of these factors, educator should explore additional materials.
  • Background material suggests that thermohaline circulation may have stopped or slowed down. In fact, scientific evidence exists that suggests that major freshwater fluxes, particularly at the end of the last major glaciation, slowed down the Gulf Stream; no scientific evidence exists that indicates a stopping of thermohaline circulation or the Gulf Stream.
  • Comments from expert scientist: Strong because it contains practice with prediction, observation, and explanation. Varies both temperature and salinity so students can differentiate between them and their separate effects on water density.

About the Pedagogy

  • The hands-on activity is the core of this investigation. However, links to animations that show the same effect is provided for educators who need to substitute the hands-on part of the investigation.
  • Students will need guidance to understand the implications of what they see in the experiment and how it relates to thermoahaline circulation. Applying this understanding to the global ocean conveyor belt will take some guidance and classroom discussions.

Technical Details/Ease of Use

  • The lesson is carefully designed and provided as a downloadable pdf. A PowerPoint presentation accompanying the lesson is available.

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