[口头报告]Rare “once-in-a-millennium” super rainstorm recorded by daily resolved δ18O of land snail shell

Rare “once-in-a-millennium” super rainstorm recorded by daily resolved δ18O of land snail shell
编号:1115 稿件编号:2830 访问权限:私有 更新:2023-04-09 21:14:36 浏览:382次 口头报告

报告开始:2023年05月06日 16:42 (Asia/Shanghai)

报告时间:15min

所在会议:[1A] 1A、第四纪地质与全球变化 » [1A-1] 1A-1 第四纪地质与全球变化

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摘要
A rare “once-in-a-millennium” super rainstorm battered Zhengzhou, central China, during July 17th to 22nd 2021 (named “7.20” Zhengzhou super rainstorm), it killed 398 people and caused billions of dollars in damage. However, a pressing question is whether this level of intensity rainstorm could be quantitatively recorded by geologic archives, so that we can better understand its historical variability beyond the range of meteorological data. Here, three land snail shells (Cathaica fasciola) were collected from Zhengzhou in 2021 and weekly to daily resolved snail shell δ18O records from June to September of 2021 were obtained by IRMS and SIMS. The daily resolved records show a dramatic negative shift between June 18th and September 18th and we infer that this shift results from the “7.20” Zhengzhou super rainstorm according to the established age framework. Furthermore, the theoretical precipitation amount of “7.20” Zhengzhou super rainstorm calculated by the amplitude of this δ18O shift using flux balance model closely approaches to the precipitation amount observed at the local meteorological station. Our results suggested that the ultra-high resolution δ18O of land snail shells have the potential to quantitatively reconstruct local synoptic scale super rainstorm events and fossil snail shells in the sedimentary strata have the possibility to be valuable material for investigating the historical variability of local super rainstorms under different climate background conditions.
关键字
land snail,rainstorm,δ18O,paleoweather
报告人
王国桢
中国科学院地球环境研究所

稿件作者
王国桢 中国科学院地球环境研究所
董吉宝 中国科学院地球环境研究所
晏宏 中国科学院地球环境研究所
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徐 鹏(13554674258;xupengwhu@whu.edu.cn)
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李星华(15527964369;lixinghua5540@whu.edu.cn)
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