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- Title
Compositions of hydrogen and oxygen isotopes of precipitation in Xiamen, southeast China coast: Seasonal variations, synoptic processes, and typhoons impact.
- Authors
Yunpeng Lin; Yunhai Li; Liang Wang; Xinjie Yin; Xiaochun Zou; Guogang Li
- Abstract
In this study, the δ²H and δ18O values of 162 precipitation samples (including 33 typhoon-related samples), collected in Xiamen, southeast China coast, during June 2018 to August 2019, were investigated and analysed. The findings indicate an obvious seasonal variation in the δ²H and δ18O, primarily influenced by the East Asia Monsoon system with notable impact from typhoon occurrences during summer months. The synoptic time-series variation of δ²H and δ18O exhibits greater complexity: three distinct types of isotopic variations were observed, indicating a clear influence from re-evaporation processes and continuing equilibrium fractionation during condensation. The variation patterns of δ²H and δ18O were dominated by the local meteorological parameters that govern the re-evaporation, whereas the overall isotopic composition of precipitation was primarily regulated by the moisture sources. The unique atmospheric structure and dynamic processes of typhoons led to a three-stage variation of δ²H and δ18O in precipitation as the distance between the typhoon's centre and the study area changed. The consistent configuration of typhoon structure prompts analogous staged changes in different typhoon-related precipitation. The trajectory of moisture source for typhoon-related precipitation demonstrates a clear spiral structure (excluding typhoon Yutu), revealing notable impacts from typhoon events.
- Subjects
XIAMEN Shi (China); CHINA; HYDROGEN isotopes; TYPHOONS; OXYGEN isotopes; SEASONS; PRECIPITATION (Chemistry); COASTS
- Publication
Quarterly Journal of the Royal Meteorological Society, 2023, Vol 149, Issue 757, p3607
- ISSN
0035-9009
- Publication type
Article
- DOI
10.1002/qj.4576