Preprints
https://doi.org/10.5194/acp-2024-4
https://doi.org/10.5194/acp-2024-4
30 May 2024
 | 30 May 2024
Status: this preprint is currently under review for the journal ACP.

Technical note: Theoretical and experimental investigation of isotopic exchange between water vapour and droplets under isothermal saturation conditions

Wenwen Bai, Jiahua Wei, Sanchuan Ni, Zhanyu Yao, Yifeng Liu, Jingjing Ding, Kaiyu Wang, Nan Liu, Liner Wang, and Miao Wu

Abstract. Water cycle process will deeply affect water vapour isotope composition, in addition to the evaporation and condensation processes, the exchange process is also a crucial process that influences isotopic variations. To explore the mechanism of isotope exchange under isothermal saturation conditions, we developed an isotope exchange calculation equation for water vapour (IECEWV) based on the conservation of exchange quantity and conducted indoor trials with 100 control groups to validate the IECEWV. The experimental findings demonstrated that the isotopic values of water vapour exhibited enrichment, depletion, and stabilisation during the exchange process when the droplet size first increased and then stabilised, because of the interaction between the exchange state, isotopic gradients, and specific surface area of the droplets according to IECEWV. The variation trend of IECEWV calculated isotopes in water vapour was consistent with experimental value, with average maximum relative errors of 1.66 % for δ2H and 3.19 % for δ18O, and IECEWV analysis further indicates isotopes exchange can lead to the hydrogen and oxygen isotope line of water vapour deviate from the origin. Furthermore, the linear relationship between hydrogen and oxygen isotopes in water vapour after exchanged can be characterised by linear clusters with the same slope, the d-excess of water vapour remains essentially constant. Future studies may combine the IECEWV with the Rayleigh fractionation model to explore the coordinated changes in precipitation and atmospheric water vapour isotopes.

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Wenwen Bai, Jiahua Wei, Sanchuan Ni, Zhanyu Yao, Yifeng Liu, Jingjing Ding, Kaiyu Wang, Nan Liu, Liner Wang, and Miao Wu

Status: open (until 11 Jul 2024)

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Wenwen Bai, Jiahua Wei, Sanchuan Ni, Zhanyu Yao, Yifeng Liu, Jingjing Ding, Kaiyu Wang, Nan Liu, Liner Wang, and Miao Wu
Wenwen Bai, Jiahua Wei, Sanchuan Ni, Zhanyu Yao, Yifeng Liu, Jingjing Ding, Kaiyu Wang, Nan Liu, Liner Wang, and Miao Wu

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Short summary
To explore influence of exchange process on vapour isotopes, IECEWV was derived based on mass conservation, indoor experiments were designed and conducted. The calculated isotopes in water vapour was consistent with experimental value, isotopes exchange can lead to the hydrogen and oxygen isotope line of vapour deviate from the origin, water vapour d-excess remains essentially constant. Combined IECEWV with the Rayleigh fractionation, vapour and precipitation isotope variation can be explored.
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