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<p>and leads to a strong <a href="page.php?w=thermocline">thermocline</a>, since this makes it more difficult for wind mixing to entrain deeper water.  Consequently, between mixing events, primary production (and the resulting processes that leads to sinking particulate material) constantly acts to consume nutrients in the mixed layer, and in many regions this leads to nutrient exhaustion and decreased mixed layer production in the summer (even in the presence of abundant light).  However, as long as the photic zone is deep enough, primary production</p><p>
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