chemoclinen.
/ˈkiːmə(ʊ)klʌɪn/, /ˈkɛmə(ʊ)klʌɪn/, U.S. /ˈkiməˌklaɪn/, /ˈkɛməˌklaɪn/ Limnology.
A distinct boundary zone in a body of water, marked by a steep concentration gradient, separating layers of water with different chemical compositions or concentrations.
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the world > the earth > water > body of water > [noun] > layers of water
mid-water1653
chemocline1937
pycnocline1957
1937 G. E. Hutchinson in Trans. Conn. Acad. Sci. 33 74 The zone of transition, where the rate of change of concentration with respect to depth is maximal, may be termed the chemocline.
1956 Ecology 37 203/2 Lower Goose Lake..is remarkable for the steepness of the gradient in the chemocline.
2004 G. W. Esch Parasites, People, & Places 22 The separation between contiguous bodies of water was created by a chemocline, a stratification gradient that resembles a thermocline, except that a chemocline is due to a chemical gradient.
This is a new entry (OED Third Edition, December 2008; most recently modified version published online March 2022).
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n.1937