Investigating the role of evaporation in dew formation under different climates using 17O-excess

With increasing aridity in many regions, dew is likely to play an increasingly important role the ecohydrological processes ecosystems, especially arid and semiarid regions. Few studies investigated of evaporation during formation how it varies under different climate settings. 17O-excess, as a new tracer, could be used extract information dynamics from natural water samples (e.g., precipitation, river, lake). Therefore, fill knowledge gap mechanisms formation, we report isotopic variation (?2H, ?18O, ?17O, 17O-excess) precipitation three distinct climatic regions (i.e., Gobabeb central Namib Desert, Nice France with Mediterranean climate, Indianapolis United States humid continental climate). We examined whether formed settings was affected by degree using observed values models processes, modeled effects key meteorological variables temperature relative humidity) on 17O-excess variations. The results showed that experienced kinetic fractionation associated non-steady state conditions enriched ?18O low values. Dew formations temperatures over 14.7 °C were also influenced conditions. However, did not experience significant evaporation. Evaporation (equilibrium or fractionation) occurring nights heavy mainly related atmosphere humidity. tracer provides method distinguish our result improved understanding formation.