Spatiotemporal variation of stable isotopic composition in precipitation: Post‐condensational effects in a humid area

摘要: In the present study, a two year dataset on δ18O and δ2H in precipitation is used to investigate hydrometeorologic controls isotopic compositions temperate maritime climate. Data was collected Denmark along transect of six sampling stations across landscape with small topographic gradient predominant westerly winds. showed local meteoric water line for this region expressed by equation δ2H = 7.4δ18O + 5.36‰. A significant trend correlating enriched values humidities around 70% during dry season more depleted ratios 90% wet derived from dataset. Temperature found only influence composition secondary way, while no relationship obtained amount evapotranspiration. It suggested that sub-cloud post-condensation exchange strongly at study site. simple model evaporation falling rain applied aim reproduce observational data show potential changing humidity conditions compositions. The rather approach did not fully explain data, but it highlights drastic changes raindrop, potentially can occur due its release into dryer atmosphere. This shows regional especially alter substantially even regions without major gradients.