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downwelling |
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The centers of anticyclonic, warm-core ocean eddies typically are zones of downwelling and therefore are nutrient-deficient. In the model simulations, as rock at the top of the mantle cools, it sinks until it reaches the 670 km boundary, Initially, the cooler, downwelling rock is not dense enough to sink into the lower mantle, so it pools right above the boundary Eventually, however, the puddle of cooler rock grows heavy enough to break through the boundary and cascade into the lower mantle, flowing toward the core. These convoluted flows cause local upwelling in some locations and downwelling --where floating particles tend to collect - in others. |
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