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[uhp-wel-ing] /ʌpˈwɛl ɪŋ/
an act or instance of welling up:
an upwelling of public support; an upwelling of emotion in his voice.
Oceanography. 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.
Origin of upwelling
1850-55; upwell + -ing1


[uhp-wel] /ʌpˈwɛl/
verb (used without object)
to well up, as water from a spring.
1880-85; up- + well2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for upwelling
  • Cool and warm waters meet here and trigger a great, green upwelling of life.
  • But if the winds slacken briefly, warm water begins to slosh back across the ocean, while the upwelling in the east slows down.
  • In fact these mountains are the youngest on the planet, being continually renewed by upwelling of magma from below.
  • The two circles are the focal points for ice break-up and may be caused by upwelling of warmer water in the lake.
  • In the crook of a switchback was a spring, upwelling and dark-tinted among creepers and weeds.
  • Large corkscrews closer to the bottom can move in a slow rotation to get the upwelling started.
  • In the sea this is borne out by the observed fact that highly productive upwelling areas are more acidic.
  • The upwelling in the channel brings in nutrients for smaller fish, which in turn attracts larger fish and the cycle continues.
  • Development of the dead zone is related to ocean upwelling-a natural process driven by winds.
  • Cold waters that rise from ocean depths carry nutrients to depleted surface waters in a process called upwelling.
Word Origin and History for upwelling

1854 (adj.), 1868 (n.), from up + present participle of well (v.).

Online Etymology Dictionary, © 2010 Douglas Harper
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upwelling in Science
The rising of cold, usually nutrient-rich waters from the ocean depths to the warmer, sunlit zone at the surface. Upwelling usually occurs in the subtropics along the western continental coasts, where prevailing trade winds drive the surface water away from shore, drawing deeper water upward to take its place. Because of the abundance of krill and other nutrients in the colder waters, these regions are rich feeding grounds for a variety of marine and avian species. Upwelling can also occur in the middle of oceans where cyclonic circulation is relatively permanent or where southern trade winds cross the Equator.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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