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Undercurrent is a flow of water below the surface: In an ocean, a subsurface current , a water current which flows beneath and usually independently of surface currents. In a river, a subsurface current (see whitewater )
A subsurface ocean current is an oceanic current that runs beneath surface currents. [1] Examples include the Equatorial Undercurrents of the Pacific, Atlantic, and Indian Oceans, the California Undercurrent, [2] and the Agulhas Undercurrent, [3] the deep thermohaline circulation in the Atlantic, and bottom gravity currents near Antarctica.
So can those ending in -ch / -tch (e.g. "the French", "the Dutch") provided they are pronounced with a 'ch' sound (e.g. the adjective Czech does not qualify). Many place-name adjectives and many demonyms are also used for various other things, sometimes with and sometimes without one or more additional words.
In physical oceanography, undertow is the undercurrent that moves offshore while waves approach the shore. Undertow is a natural and universal feature for almost any large body of water ; it is a return flow compensating for the onshore-directed average transport of water by the waves in the zone above the wave troughs .
The adjective thermohaline derives from thermo-referring to temperature and -haline referring to salt content, factors which together determine the density of seawater. The thermohaline circulation is a part of the large-scale ocean circulation that is driven by global density gradients created by surface heat and freshwater fluxes .
As an adjective, this word describes something that's moving (or happening) at a fast pace. OK, that's it for hints—I don't want to totally give it away before revealing the answer!
The Cromwell Current (also called Pacific Equatorial Undercurrent or just Equatorial Undercurrent) is an eastward-flowing subsurface current that extends the length of the equator in the Pacific Ocean.
North Brazil Undercurrent (NBUC) begins much more to the south than the NBC. The NBUC is an extension from the sub-surface current of the southern South Equatorial Current (sSEC). The sSEC travels to the South American continent because of the westward deflection of the Benguela Current from the southeast Atlantic Ocean. [ 15 ]