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downwelling

[doun-wel-ing]
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noun Oceanography.
  1. a downward current of surface water in the ocean, usually caused by differences in the density of seawater.
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Origin of downwelling

First recorded in 1965–70; down1 + well2 + -ing1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018