Diel means "in the course of the day". Thus a "diel variation" is a variation that occurs regularly every day or most days.
In many sources, the word diurnal is used in the same sense. However, in more modern or more technical usage, diurnal is reserved for the meaning "during the daytime", i.e. in contrast with nocturnal (during the nighttime) or crepuscular (during the twilight). "Diel" is therefore to be preferred where its use would not be pedantic.
Notable examples of diel from biology include:
circadian rhythm, the "internal body clock" that regulates the 24 hour cycle of biological processes in animals and plants
daily vertical migration of some forms of plankton which can move several hundreds of meters each day
Der Winzer Armin Diel ist der wohl bekannteste Weinjournalist in Deutschland.
Das er nicht nur theoretisch etwas von Wein versteht beweißen seine weltweit begehrten und belobigten Weine vom eigenen Weingut Schloßgut Diel, Burg Layen an der Nahe.
Mein erster Diel-Wein denn ich verköstigen konnte ist der "Diel de Diel" gewesen.
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