南海南部珊瑚骨骼δ18O和Sr/Ca对ENSO的分级响应

doi:10.11978/2024203

热带海洋学报 ›› 2025, Vol. 44 ›› Issue (4): 45-55.doi: 10.11978/2024203

南海南部珊瑚骨骼δ¹⁸O和Sr/Ca对ENSO的分级响应

李若安¹(), 李旭清², 陈天然²()

1.华南师范大学地理科学学院, 广东广州 510631
2.热带海洋环境与岛礁生态全国重点实验室(中国科学院南海海洋研究所), 广东广州 510301

收稿日期:2024-10-29 修回日期:2024-11-23 出版日期:2025-07-10 发布日期:2025-07-31
通讯作者: 陈天然
作者简介:
李若安(2001—), 女, 广东省江门市人, 硕士研究生, 主要从事气候变化研究。email: 2023022746@m.scnu.edu.cn
基金资助:
科技基础资源调查专项(2022FY100601); 国家自然科学基金项目(42076065)

Graded responses of coral skeletal δ¹⁸O and Sr/Ca to ENSO in the southern South China Sea

LI Ruoan¹(), LI Xuqing², CHEN Tianran²()

1. School of Geography Sciences, South China Normal University, Guangzhou 510631, China
2. State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology (CAS), Guangzhou 510301, China

Received:2024-10-29 Revised:2024-11-23 Online:2025-07-10 Published:2025-07-31
Contact: CHEN Tianran
Supported by:
Special Foundation for National Science and Technology Basic Research Program of China(2022FY100601); National Natural Science Foundation of China(42076065)

摘要/Abstract

摘要： 了解珊瑚地球化学指标对不同强度和类型的厄尔尼诺—南方涛动(El Niño-Southern Oscillation, ENSO)事件的响应差异对重建器测前的ENSO具有重要意义。本研究提取了南海南部1950年以来的海表温度(sea surface temperature, SST)数据以及来自4个地点(自西向东分别为竹岛、永暑岛、海葵园和巴拉望)已发表的珊瑚骨骼δ¹⁸O和Sr/Ca序列, 采用频域分析和滞后相关性分析等方法, 研究了南海南部海温和珊瑚骨骼地球化学指标对不同类型和等级的ENSO事件的响应。结果表明, 珊瑚骨骼地球化学指标对east Pacific (EP)-El Niño与central Pacific (CP)-El Niño的分级正确率自东向西呈现上升趋势; 而对strong basin wide (SBW)-El Niño的分级正确率则呈现自东向西逐步降低的趋势; 类似地, 对于CP-La Niña, 珊瑚骨骼地球化学指标的分级响应的正确率自东向西逐步提高; 而对于EP-La Niña, 则完全相反。整体上看, 南海南部珊瑚骨骼地球化学指标对EP-El Niño和CP-La Niña的分级响应能力不及SBW-El Niño和EP-La Niña, 对强烈ENSO事件的分级响应能力优于极端ENSO事件。

关键词: 南海南部, ENSO, 珊瑚, Sr/Ca, δ¹⁸O, 分级响应

Abstract:

Understanding the differential responses of coral geochemical proxies to El Niño-Southern Oscillation (ENSO) events of various intensities and types is crucial for reconstructing pre-instrumental ENSO variability. This study extracts sea surface temperature (SST) data from the southern South China Sea (SCS) since 1950, along with published coral skeletal δ¹⁸O and Sr/Ca time series from four locations (from west to east: Hòn Tre Island, Yongshu Island, Anemone’s Garden, and Palawan Island). Employing methods such as frequency-domain analysis and lag correlation analysis, we investigate the responses of SST and coral geochemical proxies in the southern South China Sea to different types and grades of ENSO events. The results indicate that the accuracy of coral geochemical proxies in classifying EP (east Pacific)-El Niño and CP (central Pacific)-El Niño events increases from east to west, whereas the classification accuracy for SBW (strong basin-wide)-El Niño events gradually decreases from east to west. Similarly, for CP-La Niña events, the classification accuracy of coral geochemical proxy improves progressively from east to west, while the opposite trend is observed for EP-La Niña events. Overall, the classification capability of coral geochemical proxies in the southern SCS is weaker for EP-El Niño and CP-La Niña events compared to SBW-El Niño and EP-La Niña events, with better performance in classifying strong ENSO events than extreme ENSO events.

Key words: southern South China Sea, ENSO, coral, Sr/Ca, δ¹⁸O, graded response

中图分类号:

P732

李若安, 李旭清, 陈天然. 南海南部珊瑚骨骼δ¹⁸O和Sr/Ca对ENSO的分级响应[J]. 热带海洋学报, 2025, 44(4): 45-55.

LI Ruoan, LI Xuqing, CHEN Tianran. Graded responses of coral skeletal δ¹⁸O and Sr/Ca to ENSO in the southern South China Sea[J]. Journal of Tropical Oceanography, 2025, 44(4): 45-55.

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参考文献	采样地点	经纬度	样品年代	地球化学指标	分辨率
Goodkin et al, 2021	竹岛(Hòn Tre Island)	12°12′N, 109°18′E	1950年1月—2010年10月	Sr/Ca	月
Yu et al, 2001	永暑岛(Yongshu Island)	9°33′N, 112°54′E	1951年1月—1999年4月	δ¹⁸O	季节、月
Wu et al, 2020	巴拉望岛(Palawan Island)	11°28′N, 119°01′E	1947年1月—1981年1月	δ¹⁸O	半年至双月
Krawczyk et al, 2020	海葵园(Anemone’s Garden)	4°17′N, 113°49′E	1982年1月—2016年1月	δ¹⁸O、Sr/Ca	月

南海南部珊瑚骨骼δ¹⁸O和Sr/Ca对ENSO的分级响应

Graded responses of coral skeletal δ¹⁸O and Sr/Ca to ENSO in the southern South China Sea

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