At 3000 m depth in the Atlantic Ocean, the salinity at 50°S is about 34.7. The salinity at 30°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. a.The water mass at 50°S represents Antarctic Intermediate Water. b.The water mass at 50°S represents Antarctic Bottom Water. c.The water mass at 30°S represents North Atlantic Deep Water. d.Both b and c are correct.
At 3000 m depth in the Atlantic Ocean, the salinity at 50°S is about 34.7. The salinity at 30°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.
a.The water mass at 50°S represents Antarctic Intermediate Water.
b.The water mass at 50°S represents Antarctic Bottom Water.
c.The water mass at 30°S represents North Atlantic Deep Water.
d.Both b and c are correct.
Additional ice formation in cold water along the margins of the Antarctic continent contributes to the formation of Antarctic Bottom Water (AABW), which sinks and flows northward. While colder and less saline than the water at 3000 m that originated in the North Atlantic, their densities are close. The temperature and salinity patterns, shown in Figure 5B-6 and Figure 5B-7, suggest that the water at 3000 m flowing from both high latitude locations appears identifiable from the South Atlantic around the globe to south of Australia and beyond.
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