Effect of the El Niño-Southern Oscillation on hydrogen and oxygen isotope ratios of precipitation in Guilin, SW China

This study monitored the isotopic compositions of precipitation in Guilin as well as the influence of El Niño-Southern Oscillation (ENSO) on the isotope ratios and water vapour sources from 2015 to 2016. The results indicate that the lower isotope values of precipitation from ocean water vapour sour...

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Bibliographic Details
Published in:Isotopes in environmental and health studies 2021-03, Vol.57 (1), p.67-81
Main Authors: Wu, Xia, Pan, Moucheng, Zhu, Xiaoyan, Yin, Jianjun, Wang, Zhijun, Zhang, Meiliang, Cao, Jianhua
Format: Article
Language:English
Subjects:
Air masses
China
Deuterium
Deuterium - analysis
Deuterium excess
El Nino
El Nino-Southern Oscillation
El Niño-Southern Oscillation
Environmental Monitoring - methods
Evaporation
Fractionation
Guilin
hydrogen-2
isotope hydrology
Isotope ratios
Isotopes
Meteoric water
Oxygen isotopes
Oxygen Isotopes - analysis
oxygen-18
Precipitation
Rain - chemistry
Seasons
Seawater
Southern Oscillation
Steam - analysis
Vapor sources
Water vapor
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Summary:This study monitored the isotopic compositions of precipitation in Guilin as well as the influence of El Niño-Southern Oscillation (ENSO) on the isotope ratios and water vapour sources from 2015 to 2016. The results indicate that the lower isotope values of precipitation from ocean water vapour source are affected by long transport distance and fractionation during summer and autumn. In contrast, the isotope values of winter and spring precipitation are affected by continental air masses and their evaporation sources yielding higher values. The intercepts of the local meteoric water line in Guilin are larger than those of the global meteoric water line, which is typical for subtropical monsoon climate. During the El Niño event, development of anomalous anticyclonic circulation enhances the northbound transport over the western Pacific and brings abundant water vapour to the southern part of China. During El Niño event prevailing period, precipitations exhibit a lower δ 18 O value and low d (deuterium excess) value, indicating that the 2015/2016 ENSO event had a significant effect on the precipitation distribution, precipitation amount, and isotope ratios in regional precipitation.
ISSN:1025-6016
1477-2639
DOI:10.1080/10256016.2020.1844683