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.

1850–55; upwell + -ing1

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verb (used without object)
to well up, as water from a spring.

1880–85; up- + well2

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
upwelling   (ŭp-wěl'ĭng)  Pronunciation Key 
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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Example sentences
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.
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