Pronunciation: (up-wel'ing), [key]
1. an act or instance of welling up: an upwelling of public support; an upwelling of emotion in his voice.
2. Oceanog.the process by which warm, less-dense surface water is drawn away from along a shore by offshore currents and replaced by cold, denser water brought up from the subsurface.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.