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Discussion papers
https://doi.org/10.5194/nhess-2019-352
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2019-352
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 02 Jan 2020

Submitted as: research article | 02 Jan 2020

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This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Precipitation stable isotopic signatures of tropical cyclones in Metropolitan Manila, Philippines show significant negative isotopic excursions

Dominik Jackisch1, Bi Xuan Yeo2, Adam D. Switzer1,2, Shaoneng He1, Danica Linda M. Cantarero3, Fernando P. Siringan3, and Nathalie F. Goodkin1,2,4 Dominik Jackisch et al.
  • 1Earth Observatory of Singapore, Nanyang Technological University, Singapore 639798
  • 2Asian School of the Environment, Nanyang Technological University, Singapore 639798
  • 3Marine Science Institute, University of the Philippines Diliman, Quezon City 1101, Philippines
  • 4American Museum of Natural History, New York 10024, USA

Abstract. Tropical cyclones have devastating impacts on the environment, economies, and societies, and may intensify in the coming decades due to climate change. Stable water isotopes serve as tracers of the hydrological cycle, as the fractionation process may leave distinct precipitation isotopic signatures. Here we present a record of daily precipitation isotope measurements from March 2014 to October 2015 for Metropolitan Manila, which is a first of a kind dataset for the Philippines and Southeast Asia, and analyze if there is an isotopic response to tropical cyclones. The most negative shift in δ18O value (−13.84 ‰) leading to a clear isotopic signal was caused by Typhoon Rammasun, which directly hit Metropolitan Manila. The average δ18O value of precipitation associated with tropical cyclones is −10.24 ‰, whereas the mean isotopic value for rainfall associated with non-cyclone events is −5.29 ‰. Further, the closer the storm track to the sampling site, the more negative the isotopic values, indicating that in-situ isotope measurements can provide a direct linkage between isotopes and typhoon activities in the Philippines.

Dominik Jackisch et al.
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Short summary
The Philippines is a nation very vulnerable to devastating typhoons. We investigate if stable isotopes of precipitation can be used to detect typhoon activities in the Philippines based on daily isotope measurements from Metropolitan Manila. We find that strong typhoons such as Rammasun, which occurred in July 2014, leave detectable isotopic signals in precipitation. Besides other factors, the distance of the typhoon to the sampling side plays a key role in determining the signal.
The Philippines is a nation very vulnerable to devastating typhoons. We investigate if stable...
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