Jianshun Chen , Yijia Liang , Kan Zhao , Yongjin Wang , Zhenqiu Zhang , Fucai Duan , Jingwei Zhang , Qingfeng Shao , Junji Zhu , Shaohua Yang , Lian Tang , Yuqing Wang , Hai Cheng
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引用次数: 0
Abstract
El Niño-Southern Oscillation (ENSO) is essential to the annual rainfall in the Pacific Rim, causing frequent floods and droughts in these regions. However, its relationship with precipitation in southeastern China on the interannual timescale remains uncertain. Here we reconstruct an ultra-high-resolution hydroclimate record from 2005AD to 2017AD using 301 sets of δ18O data, U/Th dates, and annual-layer counting on a stalagmite MG2 from Meiguang Cave, Jiangxi Province, southeastern China. We find that both calcite and precipitation δ18O records have negative correlations with local rainfall amount, with heavier rainfall correlating with negative excursions of δ18O, supporting the rainfall amount effects on calcite and precipitation δ18O signals on the seasonal timescale. On the interannual timescale, La Niña (El Niño) years are followed by positive (negative) rainfall years and decreased (increased) MG2 δ18O values, and all records have ∼3-year cyclicity. The antiphased correlation of medium coefficiency of the Southern Oscillation Index (SOI) with both precipitation δ18O and MG2 δ18O records implies that ENSO could modulate the calcite δ18O signals in the monsoonal region of China through circulation effects. Therefore, we suggest that changes in cave δ18O values in China can be controlled by both rainfall amount and circulation effects related with the ENSO activities, which provides a good reference for the paleoclimate studies on short timescales.
期刊介绍:
Quaternary International is the official journal of the International Union for Quaternary Research. The objectives are to publish a high quality scientific journal under the auspices of the premier Quaternary association that reflects the interdisciplinary nature of INQUA and records recent advances in Quaternary science that appeal to a wide audience.
This series will encompass all the full spectrum of the physical and natural sciences that are commonly employed in solving Quaternary problems. The policy is to publish peer refereed collected research papers from symposia, workshops and meetings sponsored by INQUA. In addition, other organizations may request publication of their collected works pertaining to the Quaternary.