Abstract From the southern coast of Peru to the central-north coast of Chile (18°-31°S), previous evidence suggests that wide variations in sea surface temperature (SST) over the Holocene may be associated with changes in coastal upwelling regimes along the region. Support for spatial contrasts and similarities in oceanographic dynamics comes from earlier work at both extremes of the region. Using a 12 kyr record derived from shell midden archaeological sites around Taltal Chile (25°S), we show that changes in the region are not necessarily consistent with a simple latitudinal gradient. Using δ13C and δ18O isotopic records from archaeological carbonate shells of the keyhole limpet Fissurella maxima we find that cold SST during the Early Holocene was associated with more negative δ13C values in agreement with observations from southern Peru. Warmer waters during the beginning of the Middle Holocene, had positive δ13C values, differentiating them from southern Peru and central-north Chile records. The rest of the Middle Holocene showed a decreasing SST, accompanied by negative δ13C values, and after 4000 cal yr BP, the Late Holocene showed a progressive increase in SST and positive δ13C values. Finally, modern carbonate shells of F. maxima indicate a situation not observed throughout the Holocene period, where warm SST is associated with negative δ13C values, in line with results on modern shells from southern Peru and modern oceanographic patterns that indicate a current intensification of coastal upwelling with events of warmer water intrusion. Our results show that the southern coast of the Atacama Desert experienced important fluctuations in SST and upwelling conditions during the Holocene, which may have affected the distribution of nearshore fisheries along the Northern Coast of Chile.

中文翻译：

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全新世近岸古海洋条件：来自阿塔卡马沙漠海岸考古遗址的壳碳酸盐

摘要 从秘鲁南部海岸到智利中北部海岸 (18°-31°S)，先前的证据表明全新世海面温度 (SST) 的广泛变化可能与沿海岸上升流制度的变化有关。该区域。对海洋动力学中空间对比和相似性的支持来自该地区两个极端的早期工作。使用来自智利塔尔塔尔 (25°S) 周围贝壳米登考古遗址的 12 kyr 记录，我们表明该地区的变化不一定与简单的纬度梯度一致。使用来自匙孔 limpet Fissurella maxima 的考古碳酸盐壳的 δ13C 和 δ18O 同位素记录，我们发现全新世早期的冷 SST 与更负的 δ13C 值相关，这与秘鲁南部的观察结果一致。中全新世初期较温暖的水域具有正的 δ13C 值，这将它们与秘鲁南部和智利中北部的记录区分开来。中全新世其余部分海温呈下降趋势，δ13C 值为负，4000 cal BP 后，全新世晚期海温逐渐升高，δ13C 值为正。最后，F. maxima 的现代碳酸盐壳表明在整个全新世期间未观察到的情况，其中温暖的 SST 与负的 δ13C 值相关，这与秘鲁南部现代贝壳的结果和表明当前沿海地区加强的现代海洋学模式一致。上升流与温暖的水入侵事件。