Lab 5B
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South Texas College *
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1445
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Geography
Date
Apr 3, 2024
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docx
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Uploaded by monimarie2756
Lab 5B 1.
In Figure 5B-2, the temperature was about ____ degrees Celsius at 50 m. c. 19.2
2.
The salinity at 50 m was near ______. b. 36.10
3.
The temperature and salinity values at a depth of 250 m in Figure 5B-2 were about ______, respectively. b. 12.7 degrees Celsius and 35.7
4.
At 1200 m, temperature and salinity were near ______, respectively. a.
11.0 degrees Celsius and 36.25
5.
At 2000 m, temperature and salinity values were near _____, respectively. a.
3.0 degrees Celsius and 35.1 6.
For the Atlantic sample, the water conditions at 50 m were nearest the ranges of temperature and salinity identified as a(n) _____ mass. d. NACSW 7.
The water conditions at 250 m fell within the ranges of temperature and salinity identified
as a(n) _______ mass. d. NACSW
8.
The water conditions at 1200 m fell within the ranges of temperature and salinity identified as a(n) _____ mass. c. MIW
9.
Utilizing your answers from #5, identify the water conditions at 2000 m on the T-S diagram. According to the T-S diagram, the density of the 2000 m sample is approximately ____ g/cm3, which makes it part of the _____ mass. d. 1.0280 … NADW
10. Based on the positions of the different water samples plotted on the T-S diagram and using the isopycnals to help identify density, ocean water density at the Atlantic Ocean site _____ with increasing depth. c. increased 11. For the Mediterranean sample, the temperature and salinity values at a depth of 50 m were about ______, respectively, as shown in Figure 5B-4. c. 19.5 degrees Celsius and 37.75 12. At 250 m, temperature and salinity were near _____, respectively. b. 13.7 degrees Celsius and 38.6 13. At 1200 m, temperature and salinity were near ______, respectively. b. 13.2 degrees Celsius and 38.5 14. As seen in Figure 5B-4 and #12-13, temperature and salinity values from 250 m to 1200 m are similar. This water flows over the Gibraltar sill and into the Atlantic, where it mixes with cooler, less saline water then sinks to within a few hundred meters of 1000 m depth. This is the source of the ______. a.
Mediterranean intermediate water 15. Why might intermediate water forming in the Mediterranean Sea flow at the same depth as intermediate water forming in the Antarctic? Reference 5B-3. d. both A and B are correct 16. Why does bottom water form in the Southern Ocean but not the Mediterranean Sea? c. Antarctic water is very cold 17. A major driving mechanism of the MOC is the sinking of water in the North Atlantic. This begins with the formation of _____. As ocean water freezes, ice crystals exclude salt
and the salinity of the surrounding water increases. c. Mediterranean intermediate water 18. Refer to Figure 5B-3. NADW has a temperature between 2.5 and 4.5 degrees Celsius and a salinity between 34.9 and 35.0 Mediterranean Intermediate Water (MIW) has a slightly lower density than NADW, with a temperature and salinity range centered at _______. c. 10 degrees Celsius and 36.0
19. Figure 5B-6 shows the water at a depth of 3000 m with temperatures ranging between 2.25 and 2.75 degrees Celsius in the Atlantic extends southward as far as about _____ degrees S latitude. b. 30
20. Figure 5B-7 shows water at a depth of 3000 m with salinity between about 34.85 and 34.9 in the Atlantic extends southward as far as about _____ degrees S latitude. b. 30 21. At 3000 m depth in the Atlantic Ocean, the salinity at 50 degrees S is about 34.7. The salinity at 30 degrees S is about 34.9. Why is there an abrupt change in salinity at this water depth? Refer to Figure 5B-3 and Figure 5B-5 to help answer the question. d. both B and C are correct
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