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← GeographyWhich outcome occurs when North Pacific gyre upwelling weakens?
A)Decreased coastal marine productivity levels✓
B)Increased thermocline depth variability
C)Enhanced sea surface salinity gradients
D)Strengthened coastal thermohaline overturning
💡 Explanation
Decreased upwelling in the North Pacific gyre leads to nutrient limitation because Ekman transport weakens, therefore reducing the vertical transport of nutrient–rich deep water, rather than increasing salinity or thermocline variability which require different mechanisms.
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