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Diurnal variation of stable isotopes in rainfall observed at Bengkulu for the YMC-Sumatra 2017
Ichiyanagi K.a,b, Suwarman R.c, Belgaman H.A.d, Tanoue M.e, Uesugi T.a, Warjonof
a Kumamoto University, Chuo-ku, Kumamoto, Japan
b Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Kanagawa, Yokosuka, Japan
c Atmospheric Science Research Group, Bandung Institute of Technology, Coblong, Kotamadya Bandung, Jawa Barat, 40132, Indonesia
d Agency for the Assessment and Application of Technology (BPPT), DKI Jakarta, 10340, Indonesia
e Shibaura Institute of Technology, Minato-ku, Tokyo, Japan
f Meteorological Climatological and Geophysical Agency (BMKG) Bengkulu, Jl. Raya Bandara Fatmawati Soekarno, Bengkulu, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2019 IOP Publishing Ltd. All rights reserved.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 δ18O 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 δ18O was lighter in both the early morning and the afternoon and heavier before noon and overnight. The δ18O 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.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]CMORPH,Controlling factors,convective,Diurnal variability,Hydrogen isotopic composition,Isotopic composition,stratiform,Sumatra , Indonesia[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]CMORPH,convective,isotopes,stratiform[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text]The authors wish to thank the staff of the BMKG (Agency for Meteorology, Climatology, and Geophysics) meteorological station at Bengkulu for assistance with precipitation sampling and for providing meteorological data. This research was supported by the Priority Organization for Innovation and Excellence, Kumamoto University, Department of Coupled Ocean-Atmosphere-Land Processes, JAMSTEC, for project research, and Japan Society for the Promotion of Science (JSPS) KAKENHI (Grant Numbers: 16H05619).[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1088/1755-1315/303/1/012008[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]