Variation of stable isotope signals in precipitation during Typhoon In-Fa (2021), Eastern China

Abstract

High-resolution stable isotope records of precipitation are crucial for our understanding about the mechanism of isotope variations during typhoon precipitation events. Here we present hourly-resolution stable isotope time series of precipitation during the Typhoon In-Fa (2021) in Kunshan and Yangzhou, located in the lower reaches of the Yangtze River in Eastern China. Precipitation δ¹⁸O in Kunshan and Yangzhou ranged from -1.3‰ to -12.3‰ and -2.8‰ to -17.1‰, respectively. Both δ¹⁸O time series have shifted to more negative values as the typhoon approached. The evolution of precipitation δ¹⁸O during the typhoon is likely caused by a combination of Rayleigh distillation and microphysical processes. Precipitation δ¹⁸O values in Yangzhou are more negative than those in Kunshan with a lag of approximately 14 hours. This was mainly controlled by further continuous rainout processes during the movement of the Typhoon In-Fa from Kunshan to Yangzhou and higher condensation efficiency. This study improves our understanding about underlining mechanisms of stable isotope changes during the typhoon precipitation.

Keywords:

• stable isotope
• precipitation
• Rayleigh distillation
• upstream rainout
• Typhoon In-Fa
• Eastern China

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Disclosure statement

No potential conflict of interest was reported by the authors.

Data availability statement

The data that supports the findings of this study are available in the supplementary material of this article.

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant Nos. 42071106) and the International Cooperation Project of Fujian (2022l0013).

Supplementary material

Supplemental data for this article can be accessed online at https://doi.org/10.1080/02626667.2024.2355977.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [Grant Nos. 42071106]; International Cooperation Project of Fujian [2022I0013].