气候变化领域集成服务门户(CCPortal): Evidence from giant-clam δ18O of intense El Ninõ-Southern Oscillation-related variability but reduced frequency 3700 years ago

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DOI	10.5194/cp-16-597-2020
	Evidence from giant-clam δ18O of intense El Ninõ-Southern Oscillation-related variability but reduced frequency 3700 years ago
	Hu Y.; Sun X.; Cheng H.; Yan H.
发表日期	2020
ISSN	18149324
起始页码	597
结束页码	610
卷号	16 期号:2
英文摘要	Giant clams (Tridacna) are the largest marine bivalves, and their carbonate shells can be used for highresolution paleoclimate reconstructions. In this contribution, δ18Oshell was used to estimate climatic variation in the Xisha Islands of the South China Sea. We first evaluate sea surface temperature (SST) and sea surface salinity (SSS) influence on the modern resampled monthly (r-monthly) resolution of Tridacna gigas δ18Oshell. The results obtained reveal that δ18Oshell seasonal variation is mainly controlled by SST and appears to be insensitive to local SSS change. Thus, the δ18O of Tridacna shells can be roughly used as a proxy of local SST: a 1% δ18Oshell change is roughly equal to 4.41 °C of SST. The r-monthly δ18O of a 40-year-old Tridacna squamosa (3673±28 BP) from the North Reef of the Xisha Islands was analyzed and compared with the modern specimen. The difference between the average δ18O of the fossil Tridacna shell (δ18O D -1:34 %) and the modern Tridacna specimen (δ18O D -1:15 %) probably implies a warm climate, roughly 0.84 °C, 3700 years ago. The seasonal variation 3700 years ago was slightly lower than that suggested by modern instrumental data, and the transition between warm and cold seasons was rapid. Higher amplitudes of reconstructed r-monthly and r-annual SST anomalies imply an enhanced climate variability during this warm period. Investigation of the El Ninõ-Southern Oscillation (ENSO) variation (based on the reconstructed SST series) indicates reduced ENSO frequency but increased ENSO-related variability and extreme El Ninõ winter events 3700 years ago. © Author(s) 2020.
语种	英语
scopus关键词	El Nino-Southern Oscillation; fossil record; oxygen isotope; paleoclimate; sea surface salinity; sea surface temperature; seasonal variation; Kenya; Kilifi; North Reef; Pacific Ocean; Paracel Islands; South China Sea; Bivalvia; Tridacna; Tridacna gigas; Tridacna squamosa
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146726
作者单位	School of Marine Sciences, Sun Yat-sen University, Guangzhou, 510006, China; Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou, 510275, China; School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou, 510275, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, China; Institute of Global Environmental Change, Xi'An Jiaotong University, Xi'an, 710054, China; Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, United States; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, 710061, China; OCCES, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266061, China
推荐引用方式 GB/T 7714	Hu Y.,Sun X.,Cheng H.,et al. Evidence from giant-clam δ18O of intense El Ninõ-Southern Oscillation-related variability but reduced frequency 3700 years ago[J],2020,16(2).
APA	Hu Y.,Sun X.,Cheng H.,&Yan H..(2020).Evidence from giant-clam δ18O of intense El Ninõ-Southern Oscillation-related variability but reduced frequency 3700 years ago.Climate of the Past,16(2).
MLA	Hu Y.,et al."Evidence from giant-clam δ18O of intense El Ninõ-Southern Oscillation-related variability but reduced frequency 3700 years ago".Climate of the Past 16.2(2020).