EarthLabs > Climate and the Carbon Cycle: Unit Overview > Lab 6: Oceans and the Carbon Cycle

Oceans and the Carbon Cycle


Many people have never seen an ocean, yet no matter where each of us lives on Planet Earth, we depend on the health of the oceans in so many waysfor food, recreation, jobs, shipping of goods, medicine, and simply for the wonder of ocean exploration and the discoveries yet to be made. But, we also depend on the oceans to absorb approximately 92 gigatons of carbon dioxide from the atmosphere each year. As humans have added more and more carbon dioxide to the atmosphere by burning fossil fuels, oceans have responded by absorbing more carbon dioxide. Indeed, the oceans have absorbed about half of all the extra carbon dioxide people have put into the air over the last 150 years!

How do oceans absorb carbon dioxide? Where does the absorbed carbon go? If fossil fuel emissions continue to increase, can oceans continue to absorb greater and greater amounts of carbon dioxide from the atmosphere? Or will carbon uptake by oceans slow down? These are all important questions that climate scientists and oceanographers are working to answer.

In Part A, you will learn how the oceans "absorb" carbon by considering three ocean processes that draw down carbon dioxide into the oceans: the physical carbon pump, the biological carbon pump and the carbonate pump. Using videos and interactives, you will explore the role of marine food webs- including plankton and microbes- in moving carbon from the atmosphere down into the deep ocean. In Part B, you will explore the role of phytoplankton in ocean uptake of carbon in greater depth by analyzing conditions and locations for its growth. You will also learn about the interdependence of the nitrogen cycle and the carbon cycle and how this interdependence can influence climate.

After completing this Lab, you should be able to:

Keeping Track of What You Learn

Throughout these labs, you will find three kinds of questions. Your teacher will let you know which answers you should record and turn in.

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