Diurnal variation of stable isotopes in rainfall observed at Bengkulu for the YMC-Sumatra 2017

DOI Web Site Web Site 被引用文献2件 参考文献11件 オープンアクセス

書誌事項

公開日
2019-07-01
資源種別
journal article
権利情報
  • http://creativecommons.org/licenses/by/3.0/
  • https://iopscience.iop.org/info/page/text-and-data-mining
DOI
  • 10.1088/1755-1315/303/1/012008
公開者
IOP Publishing

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説明

<jats:title>Abstract</jats:title> <jats:p>Diurnal variability of stable isotopes in precipitation and its controlling factors are poorly understood, especially in the tropics. This study investigated the diurnal variability of stable isotopes in rainfall observed at Bengkulu in southern Sumatra, Indonesia. Rainfall samples were collected at 6-h intervals from 1 December 2017 to 15 January 2018 for the Year of the Maritime Continent (YMC-Sumatra 2017). The oxygen and hydrogen isotopic compositions δ<jats:sup>18</jats:sup>O and δH) of the rainwater varied from –15.1%o to –1.8%o and from –108.9%o to –1.3%o, respectively, and the d-excess varied from 1.9%o to 17.1%o. The observations at Bengkulu revealed that diurnal variation in rainfall amount was not significant for the entire period; however, the δ<jats:sup>18</jats:sup>O was lighter in both the early morning and the afternoon and heavier before noon and overnight. The δ<jats:sup>18</jats:sup>O became gradually depleted in the periods of continuous rain that occurred during 1–4 and 21–24 December. The amount of morning rain was much greater than evening rain in these periods, whereas the amount of evening rain was greater than morning rain in other periods. Based on satellite-derived CMORPH data, it is assumed that morning rain and evening rain corresponded to weak rainfall over surrounding sea region and strong rainfall over inland regions of Sumatra, respectively. The differences in moisture source and ratio of stratiform/convective rain rate between morning and evening might affect the isotopic composition of rainfall in the tropics.</jats:p>

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