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← GeographyWhich effect primarily results when coastal upwelling significantly diminishes due to weakened trade winds?
A)Increased surface water salinity
B)Enhanced phytoplankton productivity
C)Decreased nutrient availability✓
D)Lower coastal sea temperatures
💡 Explanation
When upwelling weakens, nutrient transport from deep ocean layers to the surface reduces because the driving mechanism is reduced vertical water movement, leading to nutrient depletion. Therefore decreased nutrient availability ensues rather than other ecological outcomes, which depending on different physical drivers.
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