euphoticadj.

/juːˈfəʊtɪk/

Etymology: < eu- comb. form + photic adj. 2.

Pertaining to or designating the upper layer of the photic zone in sea-water where sufficient light penetrates to permit photosynthesis.

ΘΚΠ

the world > the earth > water > sea or ocean > region of sea or ocean > [adjective] > upper parts

oceanic1851

neritic1891

photic1903

euphotic1909

1909 E. Warming et al. Oecol. Plants iv. xxxvi. 150 Euphotic vegetation, which receives an abundance of light.

1959 New Scientist 1 Oct. 586/1 Only a relatively thin surface layer of the ocean, the ‘euphotic layer’, is illuminated, and so only in this layer can photosynthesis and primary production of organic matter take place.

1964 Oceanogr. & Marine Biol. 2 360 The observation at 70m represents the luminescent activity of euphotic zone inhabitants plus that of scattering layer organisms.

1970 Nature 25 July 375/1 The flux of organic carbon from the euphotic zone (0–100 m) into the deep sea and into the bottom sediments.

This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2018).

单词	euphotic
释义	euphoticadj. /juːˈfəʊtɪk/ Etymology: < eu- comb. form + photic adj. 2. Pertaining to or designating the upper layer of the photic zone in sea-water where sufficient light penetrates to permit photosynthesis. ΘΚΠ the world > the earth > water > sea or ocean > region of sea or ocean > [adjective] > upper parts oceanic1851 neritic1891 photic1903 euphotic1909 1909 E. Warming et al. Oecol. Plants iv. xxxvi. 150 Euphotic vegetation, which receives an abundance of light. 1959 New Scientist 1 Oct. 586/1 Only a relatively thin surface layer of the ocean, the ‘euphotic layer’, is illuminated, and so only in this layer can photosynthesis and primary production of organic matter take place. 1964 Oceanogr. & Marine Biol. 2 360 The observation at 70m represents the luminescent activity of euphotic zone inhabitants plus that of scattering layer organisms. 1970 Nature 25 July 375/1 The flux of organic carbon from the euphotic zone (0–100 m) into the deep sea and into the bottom sediments. This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2018). < adj.1909
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