Definition of "upwelling"

upwelling

noun
plural upwellings
1. An upward movement from a lower source.
  Quotations
  Rather separate from the abolitionist campaign, although likewise led by anglophone Evangelicals, was a sudden upwelling of commitment to worldwide mission.
  2009, Diarmaid MacCulloch, A History of Christianity, Penguin, published 2010, page 873
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
verb
1. present participle and gerund of upwell