Articles | Volume 14, issue 6
https://doi.org/10.5194/amt-14-4657-2021
https://doi.org/10.5194/amt-14-4657-2021
Research article
 | 
23 Jun 2021
Research article |  | 23 Jun 2021

Modeling the dynamic behavior of a droplet evaporation device for the delivery of isotopically calibrated low-humidity water vapor

Erik Kerstel

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Short summary
A model was developed to quantitatively describe the dynamics, in terms of vapor-phase water concentration and isotope ratios, of nanoliter-droplet evaporation at the end of a syringe needle. Such a low humidity generator can be used to calibrate laser-based water isotope analyzers, e.g., in Antarctica. We show that modeling of experimental data constrains isotope fractionation factors and the evaporation rate to physically realistic values in good agreement with available literature values.