noun Oceanography.
a downward current of surface water in the ocean, usually caused by differences in the density of seawater.

1965–70; down1 + well2 + -ing1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Huge amounts of seawater sink at known downwelling sites every winter, with the water heading south when it reaches the bottom.
Negative values imply downwelling, the onshore advection of surface waters accompanied by a downward displacement of water.
Downwelling occurs when the water on the surface of the sea becomes denser than the water beneath it and so it sinks.
Sea surface temperature and downwelling radiation data are also necessary.
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