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Discover LudwigThe word "downwelling" is correct and usable in written English.
It is a term used in meteorology and oceanography and refers to the sinking of air or water masses downward. For example, "The downwelling of cold water near the coast caused a decrease in the local sea temperature."
Dictionary
downwelling
noun
The sinking of a higher density medium through a lower density one
synonyms
Exact(5)
Conversely, downwelling forces water into the water column below the Ekman layer, inducing drift toward the Equator.
The primary downwelling regions are in the subtropical ocean waters e.g., the Sargasso Sea in the North Atlantic.
A region of convergence forces surface water downward in a process called downwelling, while a region of divergence draws water from below into the surface Ekman layer in a process known as upwelling.
An additional consequence of upwelling and downwelling for stratified waters is to create a baroclinic field of mass (that is, a volume whose horizontal pressure gradient varies with depth due to horizontal variations in temperature and salinity).
Upwelling and downwelling also occur where the wind blows parallel to a coastline.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com