Discussion
From the following list identify the region that has low chlorophyll and low nutrients.
Answer: C
The low-chlorophyll, low-nutrient region is Downwelling, anticyclonic eddy.
In an anticyclonic eddy (clockwise in the Northern Hemisphere), Ekman convergence piles warm surface water towards the centre and pushes it down. This downwelling deepens the thermocline and keeps nutrient-rich deep water away from the sunlit layer, so phytoplankton growth, and with it chlorophyll, stays low.
Cyclonic eddies do the opposite: divergence at the centre causes upwelling, lifting nutrients into the surface layer and raising chlorophyll. Pairing an anticyclonic eddy with upwelling, or a cyclonic eddy with downwelling, mixes up these two mechanisms.
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