The slope and the constant item in the meteoric water line (MWL), compared to the global MWL, are both smaller in Kunming, and are related to the evaporation enrichment of heavy isotopes as raindrops fall in unsaturated atmosphere.

• 与全球大气水线相比,昆明站大气水线的斜率和常数项均较小。 这与雨滴在未饱和大气中降落时重同位素的蒸发富集作用有关。