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← GeographyWhich effect rapidly decreases when salinity stratification weakens in North Atlantic circulation?
A)Deep water formation rate✓
B)Ekman spiral current speed
C)Subtropical gyre intensity
D)Coastal upwelling nutrient supply
💡 Explanation
When salinity stratification weakens, convective overturning decreases because density differences between surface and deep waters become smaller, thereby reducing deep water formation. Therefore formation rates decline, rather than Ekman currents, gyres, or upwelling which depend on wind and coastal geomorphology.
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