om_5 - Ocean in Motion 5: CFCs in the Ocean - A Cool Tool....

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©1998 Project Oceanography Spring Series Ocean in Motion 1 Ocean in Motion 5: CFCs in the Ocean - A Cool Tool. A. Overview 1. Ocean in Motion - Chemicals as Tracers We will look at the CFCs as an example of tracers that chemical oceanographers use to track ocean waters and calculate their age. We will briefly describe their chemistry, sources, and sinks. We will go through an exercise that is also available on the World Wide Web called "CFCs: A Cool Tool for Oceanographers", to calculate the age of a water sample. Simple mathematics and linear graphical solutions will be used. Values will be read from line graphs and used in simple calculations. Simple chemical structures and an investigation of the ozone layer are the subjects of related exercises. (Web page will be a link from the Project Oceanography homepage; http://www.marine.usf.edu/pjocean/). 2. Contents of packet Your packet contains copies of the following activities: I. CFC Worksheet II. CFC-12 Graph III. CFC-12 History Lesson IV. Ozone Exercise V. "Rule of 90" B. Program Preparation 1. Focus Points O Gases in the atmosphere and the ocean a. relationship of concentrations in both b. quantity parts per trillion (ppt) O CFCs a. reactivity with ozone in upper atmosphere b. non-reactive characteristic in ocean O CFCs as ocean tracers a. what chemical properties make it useful b. used to date the age of water O Sources and sinks of dissolved matter in the ocean O Understanding simple line graphs
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©1998 Project Oceanography Spring Series Ocean in Motion 2 2. Program Preparation A. What are the sources and sinks for the following things found in the ocean? (There may be more than one of each.) Are they found naturally, or because of human activities? a. oxygen b. freshwater c. radioactive chemicals B. Words to know: tracer- an identifiable substance as a dye or radioactive isotope, that can be followed through the course of a mechanical or biological process , providing information on the pattern of events in the process. source- point of origin; a thing or place something comes from. sink - point of final destination; the place that something concentrates for final destination stable - maintaining equilibrium; resistant to change solubility - the quality or condition of being able to dissolve in a given solvent inert - totally unreactive, chemically inactive molecule - a small particle with a nucleus and electrons bound together by electrostatic and electromagnetic forces
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om_5 - Ocean in Motion 5: CFCs in the Ocean - A Cool Tool....

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