HW 4 - 1. Describe FOUR major mechanisms by which the...

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1. Describe FOUR major mechanisms by which the oceans affect climate. a. The oceans store and transport huge amounts of CO2 and heat b. Formation and deposition of CaCO3 skeletons removes CO2 c. Phytoplankton photosynthesis uptake CO2 d. Phytoplankton produce aerosols 2. What two physical changes to seawater drive the formation of North Atlantic Deep Water (NADW) and Antarctic Bottom Water (ABW)? a. Salinity b. Temperature 3. Explain how each of these changes drive the formation of NADW and ABW. a. Sea ice freezing increases salinity of the water and the decrease in temperature creates dense water. This cold, salinity rich water sinks and travels along the bottom of the ocean. . 4. Identify FOUR methods used to indicate sub-surface current speed. a. Radioactive tritium b. CFCs c. Ripple marks on deep sea floor indicate current d. Atmospheric Tracers 5. Describe two hypothetical large-scale oceanographic changes that could reduce the rate of NADW formation. a. A large influx of water from melting ice would dilute water making it longer dense enough to sink b. Mediterranean dammed would cut off the salt supply which would prevent the formation of dense water.
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6. What are the two main methods of studying past climates using glacial ice
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HW 4 - 1. Describe FOUR major mechanisms by which the...

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