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← GeographyWhich effect on global CO₂ levels results when El Niño suppresses coastal upwelling?
A)Algal blooms drastically increase globally
B)Phytoplankton productivity dramatically declines✓
C)Marine bacteria experience population explosion
D)Decomposition in sediments causes methane spikes
💡 Explanation
Reduced upwelling during El Niño decreases nutrient availability; this limits phytoplankton growth due to nutrient limitation, a bottom-up control. Therefore, CO₂ uptake lessens because phytoplankton draw it down, rather than increase like during algal blooms or affect decomposition significantly.
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