What does upwelling mean?
Upwelling most often names the movement of cold, deep ocean water toward the surface. In coastal and equatorial regions, winds and the Earth's rotation can push surface water aside, allowing nutrient-rich water to rise; this process supports plankton, food webs, and productive fisheries. The word can also describe a literal welling or rising of liquid and, figuratively, a sudden outpouring of feeling, activity, or support, as in “an upwelling of public protest.” In oceanography, “upwelling” is the established technical term, while in general writing it may sound formal or metaphorical. The related verb “upwell” is less common than the noun and is especially used for water moving upward. Because the phenomenon connects a seemingly small vertical movement with major ecological effects, upwelling illustrates how physical processes in the ocean shape life, climate, and human food supplies.
The process in which cold, deep ocean water rises toward the surface, carrying dissolved nutrients; also, a literal or figurative upward welling or expression.
"Strong coastal upwelling brought nutrient-rich water near the shore."
The process itself may be treated as a mass noun, while a particular occurrence or figurative expression is countable: “an upwelling of support.”
To rise or well upward, especially as ocean water moves from deeper layers toward the surface.
"Cold water is upwelling along the western edge of the basin."
This is the present participle of “upwell”; the simpler present-tense form is “upwells.”
The plural is used for distinct occurrences, regions of ocean upwelling, or figurative outpourings.
"The study identified several seasonal upwellings along the coast."
Upwelling turns the deep sea into a pantry: cold, nutrient-rich water rises to the surface and fuels an entire food web.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does upwelling come from?
Upwelling was formed from the combination of “up” and “welling.” Its second element continues Old English wælle, meaning “spring” or “source,” preserved in modern “well,” while “up” continues Old English up, meaning “on” or “on high.” The compound developed both literal senses of rising or welling and a figurative sense of a strong outward expression, while its specialized oceanographic use became established in the twentieth century.
Related word forms
How upwelling is actually used
The technical oceanographic sense is standard in Earth and marine sciences. The figurative sense is usually countable, as in “an upwelling of support,” and may sound somewhat formal in general writing. As a verb form, “upwelling” is the present participle of “upwell” and is less common than the noun.