Geography • Physical GeographyHard
Evaluate the hydrological properties and water mass characteristics of oceanic thermohaline circulation: Statement I: Deep water formation occurs primarily in high-latitude polar regions where surface water cooling and intense brine rejection during sea ice freezing increase water density. Statement II: The global conveyor belt circulation takes roughly one thousand years to complete a full cycle of deep ocean mixing and surface return currents. Which of the following is correct?
A. Statement I is correct and Statement II is incorrect
B. Statement I is incorrect and Statement II is correct
C. Both Statement I and Statement II are correct✓ Correct Answer
D. Both Statement I and Statement II are incorrect
💡 Solution & Explanation
Both statements are accurate because cold temperatures and high salinity drive deep water sinking in the North Atlantic and around Antarctica, powering a slow global overturning circulation spanning centuries. Ignoring thermohaline dynamics prevents accurate modeling of global heat redistribution and long-term climate variability. Oceanographers measure potential temperature and salinity anomalies to trace these deep-sea pathways.
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