Lab 3A

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South Texas College *

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Geography

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Apr 3, 2024

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docx

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Lab 3A 1. According to Figure 3A-1, ocean water at A has a density near ____ g/cm3. a. 1.0270 2. Imagine that ocean water at A is heated to 6 degrees Celsius with no change in salinity. Its density is now ____ g/cm3. a. 1.0265 3. This experiment shows that when salinity is held constant, an increase in temperature can cause ocean water density to ____. a. decrease 4. Return to the original position at A on the T-S Diagram. Then move the ocean water salinity to 34.9 while the temperature remains constant. The density value is ____ g/cm3. c. 1.0280 5. This illustrates that at constant temperature, an increase in the salinity of ocean water causes its density to _____. c. increase 6. Return to the original position at A. Following the isopycnal, what is the salinity that corresponds to a temperature of 11 degrees Celsius? b. 35.3 7. The temperature and salinity of the ocean water at point C would be the average of the original sample values. The density of the water at point C is ____ the original density of ocean water at A and B. a. greater than 8. Caballing is the mixing of water masses to produce a blend that is denser than either of the original water masses. This new water will ___ the surround water column. Caballing contributes to vertical circulation in some higher latitude locations in the Northern Hemisphere. c. sink through 9. In regions of the ocean where the weather is persistently fair with little precipitation and temperatures are constantly high, evaporation rates are higher. Consequently the salinity of surface waters is relatively ____.
b. high 10. Along the eastern equatorial Pacific, fresh water enters the surface ocean by precipitation. The surface water salinity in these regions would be ____. b. between 30 and 35 11. At high latitudes, freezing ocean water excludes salts, trapping them in brine cells between ice crystals or draining them into the underlying ocean. The combination of the low temperatures and increased salinity results in the underlying ocean water with a relatively ____ density. a. higher 12. Comparison of North Pacific and North Atlantic isotherms shows that at the same latitudes the mean annual SST is lower along the U.S. ____ Coast. This contrast in SST’s is due to surface ocean currents that flow southward along the West Coast and northward along the East Coast. a. west 13. Imagine a straight line across the map to represent the equator. Along the equator, the ____ Ocean exhibits the greatest range in its mean annual SST. c. Pacific 14. Which region of the ocean has the warmest surface temperature? d. Both b and c are correct / western pacific ocean and eastern Indian ocean 15. According to Figure 3A-3, the highest values of SSS in the ocean are generally located ____. a. in the subtropical latitudes 16. For the area in #15, these relatively high values of SSS are likely due to ____. b. greater evaporation than precipitation 17. Low SSS values in the Bay of Bengal (located to the east of India) are likely due to ____. b. river input 18. Surface ocean salinity in the Atlantic Ocean is highest near the _____. (Click on Figure 3A-3 to see a larger imagine and zoom in.) b. Gulf of Mexico
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