Abstract Carbonate clumped isotope thermometry is a powerful tool for reconstructing paleotemperature and paleosalinity. Despite its broad application in biotic and abiotic materials, its use in paleoclimate studies has been limited due to the large amount of material and high precision required for each temperature estimate. In addition, it is still uncertain to what extent the clumped isotope signal is modified during calcification in various organisms. Using an analytical approach that minimizes sample size, we analysed clumped isotopes (Δ47) in two bivalve shells from the upwelling-dominated Gulf of Panama to reconstruct seasonal temperature and salinity variations. Using the high-resolution profiles in δ18Oshell, we grouped Δ47 measurements into several intervals to obtain robust average temperature estimates. The reconstructed temperatures agree with available observational data at the 95 % confidence level, reflecting seasonal temperature changes of at least ∼6 °C. By combining bivalve δ18Oshell and Δ47-based temperatures, we obtain realistic estimates of seasonal δ18Oseawater and salinity changes. Our results suggest that clumped isotopes in bivalve shells can be used for seasonal temperature reconstructions and for disentangling the temperature and δ18Oseawater signals in δ18Oshell variations.

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双壳贝壳中的成簇同位素温度测量法：重建季节性上升流的工具

摘要 碳酸盐团块同位素测温法是重建古温度和古盐度的有力工具。尽管它在生物和非生物材料中有着广泛的应用，但由于每个温度估计需要大量的材料和高精度，因此它在古气候研究中的应用受到了限制。此外，目前尚不确定在各种生物体钙化过程中聚集的同位素信号在多大程度上被改变。我们使用最小化样本量的分析方法分析了来自上升流主导的巴拿马湾的两个双壳类贝壳中的成簇同位素 (Δ47)，以重建季节性温度和盐度变化。使用 δ18Oshell 中的高分辨率剖面，我们将 Δ47 测量值分组为几个间隔，以获得可靠的平均温度估计值。重建的温度在 95% 的置信水平与可用的观测数据一致，反映了至少 ~6°C 的季节性温度变化。通过结合双壳类 δ18Oshell 和基于 Δ47 的温度，我们获得了季节性 δ18O 海水和盐度变化的真实估计。我们的研究结果表明，双壳类贝壳中的成簇同位素可用于季节性温度重建，并可用于解开 δ18O 壳变化中的温度和 δ18O 海水信号。