Colpophyllia natans From Tobago, a Novel Paleoclimate Archive for Reconstructing Sea Surface Temperature in the Tropical Atlantic
Colpophyllia natans From Tobago, a Novel Paleoclimate Archive for Reconstructing Sea Surface Temperature in the Tropical Atlantic
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DOI：
10.1029/2022pa004483
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发表时间：
2022-12
影响因子：
3.5
通讯作者：
Maria Rosabelle Ong;N. Goodkin;Reia Guppy;K. Hughen
中科院分区：
文献类型：
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作者：
Maria Rosabelle Ong;N. Goodkin;Reia Guppy;K. Hughen
大型长寿的Siderastrea和Diploria珊瑚是北大西洋海表温度（SST）重建的常用物种。然而，很少发现它们的年龄超过200岁。因此，必须不断开发古重建的替代类群。Colpophyllia natans是北大西洋热带珊瑚中的一种，以生长大型群体而闻名，可能包含数百年的环境记录。然而，其低密度和复杂的结构对从这种珊瑚中提取气候信号构成了挑战。这项研究提出了第一个每月解决的Colpophyllia natans气候校准，并验证了其效用作为一个新的古档案，相对于Siderastrea sidererea。月和年际珊瑚Sr/Ca与仪器SST的线性回归显示了稳健的、显著的关系（p < 0.05），表明沿着C.纳坦群岛使气候得以重建。此外，两种珊瑚捕获相似的SST变化（t检验，p ≥ 0.05），这允许生成一个单一的复合种间SST记录，与仪器SST的相关性甚至比单个珊瑚更强（p < 0.0001）。年平均和北方夏季种间SST与北大西洋SST指数显著相关（p < 0.05），表明有能力捕捉北大西洋区域的长期SST趋势。北半球冬季种间SST与仪器SST和位势高度异常的空间相关图揭示了与北大西洋涛动相关的连贯空间格局。我们的研究结果表明，Colpophyllia natans具有巨大的潜力，作为一个新的古气候档案重建的时间和空间SST变化在热带大西洋。
Massive, long‐lived Siderastrea and Diploria corals are species commonly used for sea surface temperature (SST) reconstructions in the North Atlantic. However, they are rarely found to exceed 200 years in age. Thus, it is imperative to continuously develop alternative taxa for paleoreconstructions. Colpophyllia natans, a highly populous tropical North Atlantic coral, are known to grow large colonies, potentially containing environmental records spanning several hundreds of years. However, its low density and complicated architecture poses a challenge in extracting climate signals from this coral. This study presents the first monthly‐resolved climate calibration of Colpophyllia natans and validates its utility as a new paleoarchive, relative to Siderastrea siderea. Linear regressions of monthly and interannual coral Sr/Ca with instrumental SST reveal robust, significant relationships (p < 0.05), indicating that microsampling along a single thecal wall of C. natans allowed for robust climate reconstructions. Additionally, both corals capture similar SST variations (t‐test, p ≥ 0.05), which allowed for the generation of a single, composite interspecies SST record that correlates with instrumental SST even more strongly (p < 0.0001) than the individual corals. Mean annual and boreal summer interspecies SST correlate significantly with North Atlantic SST indices (p < 0.05), demonstrating the ability to capture regional, long‐term SST trends in the North Atlantic. Spatial correlation maps of boreal winter interspecies SST to instrumental SST and geopotential height anomalies reveal coherent spatial patterns linked to the North Atlantic Oscillation. Our findings suggest that Colpophyllia natans has enormous potential as a new paleoclimate archive for reconstructing temporal and spatial SST variability in the tropical Atlantic.