Articles | Volume 24, issue 5
https://doi.org/10.5194/acp-24-3279-2024
https://doi.org/10.5194/acp-24-3279-2024
Research article
 | 
15 Mar 2024
Research article |  | 15 Mar 2024

Spring tropical cyclones modulate near-surface isotopic compositions of atmospheric water vapour in Kathmandu, Nepal

Niranjan Adhikari, Jing Gao, Aibin Zhao, Tianli Xu, Manli Chen, Xiaowei Niu, and Tandong Yao

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Cited articles

Acharya, S., Yang, X., Yao, T., and Shrestha, D.: Stable isotopes of precipitation in Nepal Himalaya highlight the topographic influence on moisture transport, Quatern. Int., 565, 22–30, https://doi.org/10.1016/j.quaint.2020.09.052, 2020. 
Adhikari, N., Gao, J., Yao, T., Yang, Y., and Dai, D.: The main controls of the precipitation stable isotopes at Kathmandu, Nepal, Tellus B, 72, 1–17, https://doi.org/10.1080/16000889.2020.1721967, 2020. 
Bohlinger, P., Sorteberg, A., and Sodemann, H.: Synoptic conditions and moisture sources actuating extreme precipitation in Nepal, J. Geophys. Res.-Atmos., 122, 12653–12671​​​​​​​, https://doi.org/10.1002/2017JD027543, 2017. 
Boschi, R. and Lucarini, V.: Water pathways for the Hindu-Kush-Himalaya and an analysis of three flood events, Atmosphere, 10, 489, https://doi.org/10.3390/atmos10090489, 2019. 
Brand, W. A., Geilmann, H., Crosson, E. R., and Rella, C. W.: Cavity ring-down spectroscopy versus high-temperature conversion isotope ratio mass spectrometry; a case study on delta (2) H and delta (18) O of pure water samples and alcohol/water mixtures, Rapid Commun. Mass Spectrom., 23, 1879–1884, https://doi.org/10.1002/rcm.4083, 2009. 
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Short summary
Atmospheric water vapour isotopes at Kathmandu recorded significantly low δ18Ov and δDv values during cyclones Tauktae and Yaas in 2021, originating in the Arabian Sea and Bay of Bengal, respectively. Such depletion was associated with the intense moisture convergence and strong convection near the sampling site. The lower δ18Ov and higher d-excessv values during cyclone Yaas may be attributed to the occurrence of robust downdrafts during the rainfall.
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