from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The act or an instance of rising up from or as if from a lower source: an upwelling of emotion.
- n. A process in which cold, often nutrient-rich waters from the ocean depths rise to the surface.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An upward movement from a lower source.
- n. 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
From up- + welling. (Wiktionary)