Effect of precipitation seasonality on annual oxygen isotopic composition in the area of spring persistent rain in southeastern China and its paleoclimatic implication

Haiwei Zhang, Hai Cheng, Yanjun Cai, Christoph Spötl, Ashish Sinha, Gayatri Kathayat, Hanying Li

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3 Scopus citations

Abstract

This study examines the seasonality of precipitation amount and δ18O over the monsoon region of China (MRC). We found that the precipitation amount associated with the East Asian summer monsoon (EASM) in the spring persistent rain (SPR) region is equivalent to that of the nonsummer monsoon (NSM). The latter contributes ∼ 50% to amount-weighted annual δ18O values, in contrast with other areas in the MRC, where the δ18O of annual precipitation is dominated by EASM precipitation. Interannual relationships between the El Niño-Southern Oscillation (ENSO) index, simulated δ18O data from IsoGSM, and seasonal precipitation amount in the SPR region were also examined. We found that on interannual timescales, the seasonality of precipitation amount (EASM =NSM ratio) was modulated by ENSO and primarily influences the variability of amountweighted annual precipitation δ18O values in the SPR region, although integrated regional convection and moisture source and transport distance may also play subordinate roles. During El Niño (La Niña) phases, less (more) EASM and more (less) NSM precipitation leading to lower (higher) EASM=NSM precipitation amount ratios results in higher (lower) amount-weighted annual precipitation δ18O values and, consequently, in higher (lower) speleothem δ18O values. Characterizing spatial differences in seasonal precipitation is, therefore, key to correctly interpreting speleothem δ18O records from the MRC.

Original languageEnglish (US)
Article number211-2020
Pages (from-to)211-225
Number of pages15
JournalClimate of the Past
Volume16
Issue number1
DOIs
StatePublished - Jan 30 2020

Bibliographical note

Funding Information:
This research has been supported by the NSFC (grant no. 41502166), the China Postdoctoral Science Foundation (grant no. 2015M580832), the State Key Laboratory of Loess and Quaternary Geology (grant no. SKLLQG1046), and the Key Laboratory of Karst Dynamics, Ministry of Land and Resources of the People's Republic of China (MLR) and Guangxi Zhuang Autonomous Region (GZAR) (grant no. KDL201502).

Funding Information:
Financial support. This research has been supported by the NSFC (grant no. 41502166), the China Postdoctoral Science Foundation (grant no. 2015M580832), the State Key Laboratory of Loess and Quaternary Geology (grant no. SKLLQG1046), and the Key Laboratory of Karst Dynamics, Ministry of Land and Resources of the People’s Republic of China (MLR) and Guangxi Zhuang Autonomous Region (GZAR) (grant no. KDL201502).

Publisher Copyright:
© Author(s) 2020.

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