One-year continuous observations of near-surface atmospheric water vapor stable isotopes at Matara, Sri Lanka, reveal a strong link to moisture sources and convective intensity

Wu, Yuqing; Gao, Jing; Zhao, Aibin; Niu, Xiaowei; Liu, Yigang; Ratnasekera, Disna; Gamage, Tilak Priyadarshana; Samantha, Amarasinghe Hewage Ruwan

doi:https://doi.org/10.5194/acp-25-4013-2025

Articles | Volume 25, issue 7

https://doi.org/10.5194/acp-25-4013-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-25-4013-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 25, issue 7

Research article

|

09 Apr 2025

Research article |

| 09 Apr 2025

One-year continuous observations of near-surface atmospheric water vapor stable isotopes at Matara, Sri Lanka, reveal a strong link to moisture sources and convective intensity

Yuqing Wu, Jing Gao, Aibin Zhao, Xiaowei Niu, Yigang Liu, Disna Ratnasekera, Tilak Priyadarshana Gamage, and Amarasinghe Hewage Ruwan Samantha

Supplement

https://doi.org/10.5194/acp-25-4013-2025-supplement

Data sets

One-year Continuous Observations of Near-Surface Atmospheric Water Vapor Stable Isotopes at Matara, Sri Lanka Jing Gao and Yuqing Wu https://doi.org/10.5281/zenodo.12736892

ERA5 hourly data on single levels from 1940 to present Hans Hersbach et al. https://doi.org/10.24381/cds.adbb2d47

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Monitoring of atmospheric water vapor isotopes for 1 year at Matara, Sri Lanka, revealed clear seasonal variations in δ¹⁸O and d-excess. The results showed lower amplitudes of δ¹⁸O during the southwest monsoon and higher amplitudes of δ¹⁸O during the northeast monsoon. Sea surface evaporation and regional convective activity influenced the isotopic compositions. Our results facilitate an understanding of the impacts of local meteorological conditions on tropical water vapor isotope signals.