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← GeographyWhich outcome primarily results when upwelling zones experience increased stratification due to surface warming?
A)Enhanced nutrient delivery to phytoplankton
B)Decreased primary productivity in surface waters✓
C)Increased dissolved oxygen concentrations at depth
D)Reduced ocean acidification near coastlines
💡 Explanation
When upwelling zones experience increased stratification, reduced vertical mixing occurs because warm surface waters block the upward movement of nutrient-rich deep waters, leading to nutrient limitation in the photic zone. Therefore, decreased primary productivity results, rather than enhanced production, increased oxygen, or reduced acidification, all of which depend on robust upwelling.
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