The Seasonally Altered Atmosphere Moisture Circulations With Rainfall and Rainfall Isotopes in Southwest China

Jingyao Zhao; Jingyao Zhao; Liangcheng Tan; Liangcheng Tan; Dong Li; Carlos Pérez-Mejías; Xiyu Dong; Jian Wang; Haiwei Zhang; Hai Cheng; Hai Cheng; Hai Cheng

doi:10.3389/feart.2022.795857

Frontiers in Earth Science (Feb 2022)

The Seasonally Altered Atmosphere Moisture Circulations With Rainfall and Rainfall Isotopes in Southwest China

Jingyao Zhao,
Jingyao Zhao,
Liangcheng Tan,
Liangcheng Tan,
Dong Li,
Carlos Pérez-Mejías,
Xiyu Dong,
Jian Wang,
Haiwei Zhang,
Hai Cheng,
Hai Cheng,
Hai Cheng

Affiliations

Jingyao Zhao: Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an, China
Jingyao Zhao: Key Laboratory of Karst Dynamics, Ministry of Land and Resources, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, China
Liangcheng Tan: Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an, China
Liangcheng Tan: State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, China
Dong Li: Library of Chang’an University, Xi’an, China
Carlos Pérez-Mejías: Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an, China
Xiyu Dong: Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an, China
Jian Wang: Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an, China
Haiwei Zhang: Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an, China
Hai Cheng: Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an, China
Hai Cheng: State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, China
Hai Cheng: Key Laboratory of Karst Dynamics, Ministry of Land and Resources, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, China

DOI: https://doi.org/10.3389/feart.2022.795857
Journal volume & issue: Vol. 10

Abstract

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To interpret the climatic signals of precipitation/speleothem δ18O, it is critical to identify the importance of the factors affecting the precipitation δ18O. This study presents new stable isotope data for precipitation δ18O and δD in the site of Shenqi cave, southwest China, from November-2015 to October-2016 (the “Super-El Niño” event), to investigate the regional-scale climate forcing on precipitation δ18O. The precipitation δ18O, δD and d-excess have an obvious seasonality, relatively low values in the wet season and high in the dry season. The further analysis of seasonally altered LMWL and moisture circulations suggested that changes in atmosphere moisture circulations would be the key factor underlying the precipitation/speleothem δ18O fluctuations in our study area at least on seasonal timescales. Combined with the seasonal-monthly variations of the IsoGSM δ18O, GPCP/CRU rainfall and NCEP/NCAR moisture fluxes, we detected that the super-El Niño of 2016 have changed the distributions of monthly rainfall in wet season through the Western Pacific Subtropical High, but not mainly the precipitation isotopic compositions and moisture circulations in our study area.

Published in Frontiers in Earth Science

ISSN: 2296-6463 (Online)
Publisher: Frontiers Media S.A.
Country of publisher: Switzerland
LCC subjects: Science
Website: https://www.frontiersin.org/journals/earth-science

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