I am looking for a reference (e.g. book, peer-reviewed paper) that asserts that absolute humidity is "equivalent" to the dew-point temperature.
Such statement should be true, AFAIU. Online, people say they are the same, in scientific publications they look almost linearly related in some range of temperatures here, figure 4, I tested their relation on data I have and their correlation is $ > 0.98$.
But I am unable to find a reference that states the absolute humidity and the dew-point temperature are "equivalent", "highly correlated (under reasonable conditions)", or that "one can serve as a proxy for the other". Please help me find such reference.