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Environmental Chemistry Letters

, Volume 15, Issue 4, pp 739–745 | Cite as

H and O isotopic differences in typhon and urban-induced heavy rain in Tokyo

  • Ryunosuke UchiyamaEmail author
  • Hiroshi Okochi
  • Hiroko Ogata
  • Naoya Katsumi
  • Daisuke Asai
  • Takanori Nakano
Original Paper
  • 233 Downloads

Abstract

Stable isotope ratios of hydrogen and oxygen of water are useful tracers of the hydrological cycle. For example, isotopes monitor the evapotranspiration in vegetated areas, local snow ice processes and stream water flow processes. δ18O and δD in rainwater reflect the processes of evaporation, condensation and precipitation. Heavy rains thus modify the stable isotope ratio of ground water, stream water and transpiration water vapor. However, the controlling factors of δ18O and δD are not clear. Here we analyzed the inorganic ion concentration and stable isotope ratio in 38 normal rainwater and 15 heavy rainwater samples were collected in Shinjuku, Tokyo, Japan, during four years from October 2012 to December 2015. Results show a decrease in δ18O and δD values with the total rainfall amount, thus highlighting the amount effect. δ18O and δD volume-weighted mean values in typhoon heavy rain were higher than the values estimated from amount effect, whereas δ18O and δD volume-weighted mean values in urban-induced heavy rain were lower. Typhoon heavy rain has high Na+ ratio and stable isotope ratios, while urban-induced heavy rain has low Na+ ratio and stable isotope ratio.

Keywords

Stable isotopes Water vapor source Sea salt Rain formation process 

Notes

Acknowledgements

This research partly supported by the Nippon Life Insurance Foundation.

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.Department of Resources and Environmental Engineering, Graduate School of Creative Science and EngineeringWaseda UniversityShinjuku-kuJapan

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