Exploring branching corals as high-resolution paleo-SST archives

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL Quaternary Science Reviews Pub Date : 2025-02-01 DOI:10.1016/j.quascirev.2024.109137

Tianran Chen , Xiaolan Tan , Ting Zhang , Sheng Liu , Jianxin Zhao

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Abstract

Branching coral reconstructions have the potential to significantly enrich paleoclimate records derived from fossil reef cores. This study explores the utility of Acropora and Pocillopora corals as high-resolution archives for paleo-sea surface temperatures (paleo-SSTs) in the western tropical Pacific. Analyses of biweekly-to weekly-resolution Sr/Ca ratios in modern corals revealed distinct seasonal variations consistent with local SSTs, particularly during the 2016 El Niño event. Given the evident interspecies variabilities in Sr/Ca, separate calibration equations from combined Sr/Ca-SST records were established for each genus. These equations were applied to derive paleo-SSTs from subfossil core records, which were subsequently integrated into a ∼1000-year paleo-SST reconstruction. Our paleo-SST records showed comparability with reconstructed SSTs from other archives in adjacent regions. These findings highlight the potential of branching corals as novel and abundant sources of paleo-SST data. Additionally, this study emphasizes the need to address uncertainties arising from sample size limitations and inter-colony offsets. Incorporating data from both branching genera and massive corals, such as Porites, could further expand and enhance subfossil archives for robust paleoclimate reconstructions.

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探索分支珊瑚作为高分辨率古海温档案

分支珊瑚重建有可能显著丰富来自化石礁芯的古气候记录。本研究探讨了Acropora和Pocillopora珊瑚作为热带西太平洋古海表温度（古ssts）的高分辨率档案的效用。对现代珊瑚两周至一周分辨率Sr/Ca比值的分析显示，与当地海温一致的明显季节变化，特别是在2016年El Niño事件期间。考虑到Sr/Ca的种间差异，对每个属分别建立了Sr/Ca- sst组合记录的标定方程。这些方程应用于从亚化石岩心记录中推导古海温，随后将其整合到一个~ 1000年的古海温重建中。我们的古海温记录与邻近地区其他档案重建的海温具有可比性。这些发现突出了分支珊瑚作为新的和丰富的古海温数据来源的潜力。此外，本研究强调需要解决由样本量限制和群体间偏移引起的不确定性。结合来自分支属和大型珊瑚（如Porites）的数据，可以进一步扩展和增强亚化石档案，用于强大的古气候重建。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Quaternary Science Reviews 地学-地球科学综合

CiteScore

7.50

自引率

15.00%

发文量

388

审稿时长

3 months

期刊介绍： Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.