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← GeographyWhich flow behavior occurs in fjord estuaries when freshwater runoff creates a less dense surface layer during winter?
A)Saltwater intrusions driven by density gradients✓
B)Thermocline formation inhibiting vertical mixing
C)Convection cells accelerating ice formation
D)Upwelling of nutrient-rich deep water
💡 Explanation
When freshwater runoff creates a less dense surface layer, a strong pycnocline forms because density differences drive gravitational circulation, causing saltwater intrusion from the deeper layers. Therefore salt water intrusions happens rather than thermocline, convection cells, or upwelling, which require different forcing conditions and density profiles.
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