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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/cp-2018-138
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2018-138
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 05 Nov 2018

Research article | 05 Nov 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).

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

Haiwei Zhang1,2, Hai Cheng1,3, Yanjun Cai2,1, Christoph Spötl4, and Ashish Sinha5 Haiwei Zhang et al.
  • 1Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an 710054, China
  • 2Institute of Earth Environment, Chinese Academy of Sciences, State Key Laboratory of Loess and Quaternary Geology, Xi’an 710061, China
  • 3Department of Earth Sciences, University of Minnesota, Minneapolis, Minnesota 55455, USA
  • 4Institute of Geology, University of Innsbruck, Innsbruck 6020, Austria
  • 5Department of Earth Science, California State University Dominguez Hills, Carson, California 90747, USA

Abstract. This study examines the seasonality of precipitation amount and δ18O over the monsoon region of China (MRC). We find 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 non-summer monsoon (NSM), with the latter contributing ~50% to the amount-weighted annual δ18O values in contrast with other areas of the monsoon region of China (MRC) where the δ18O of annual precipitation is dominated by the EASM precipitation. The interannal relationships between ENSO index, simulated δ18O data and seasonal precipitation amount in the SPR region were also analyzed. We find that on interannual timescales, less (more) EASM and more (less) NSM precipitation leading to lower (higher) EASM/NSM precipitation amount ratios result in higher (lower) precipitation δ18O and consequently, in speleothems δ18O during El Niño (La Niña) phases, although moisture sources and pathways may also impact this relationship. Characterizing the spatial differences in seasonal precipitation is therefore, key in correctly interpreting the speleothem δ18O records from the MRC.

Haiwei Zhang et al.
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Short summary
Few studies have paid attention to the important effect of non-summer monsoon precipitation on the oxygen isotope compositon of precipitation/speleothem δ18O in southeastern China. In this paper we discuss the relationships between seasonal precipitation amount, annual oxygen isotope compositon and ENSO in the area of spring persistent rain in southeastern China. Characterizing the spatial differences in seasonal precipitation is key in interpreting the speleothem oxygen isotope record in China.
Few studies have paid attention to the important effect of non-summer monsoon precipitation on...
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