upwelling

/AH1 P W EH0 L IH0 NG/
verb
  1. 1

    (of a fluid) To rise from a lower source; to well up.

noun
  1. 1

    An upward movement from a lower source.

  2. 2

    The oceanographic phenomenon that occurs when strong, usually seasonal, winds push water away from the coast, bringing cold, nutrient-rich deep waters up to the surface

Antonyms

Source: https://en.wiktionary.org/wiki/upwell, https://en.wiktionary.org/wiki/upwelling