The main objective of this study is to reconstruct surface water dynamics occurring along the Western Iberian Margin (WIM) relating them to the position of the Subpolar Front and to the dynamics affecting the Subtropical gyre. The study, centred on changes in calcareous nannoplankton paleo-assemblages at IODP Site U1385 (37°34.285′N; 10°7.562′W), allows to reconstruct the regional surface water circulation patterns, as well as the surface paleoproductivity fluctuations and the water column stratification between ̴ 25 and 0 ka. Abrupt changes in calcareous nannoplankton paleo-assemblages occurr at the transition from glacial to interglacial conditions. The glacial conditions (25.3–11.5 ka) are characterized by dominance, of cold calcareous nannoplankton species, suggesting prevalent Portugal Current (PC) influence and a shift southward of the Intertropical Convergence Zone (ITCZ), as consequence of Northern Hemisphere (NH) insolation minima. Whereas opposite conditions verified during the interglacial interval (11.5–0.84 ka), favour the proliferation of warm species because of a strong Iberian Poleward Current (IPC) influence in the entire area. The Last Glacial Maximum (LGM) is characterized by a moderate productivity together with a decreasing mixing and the establishment of a medium-deep nutricline. Subpolar and Subtropical Fronts migration southward during Heinrich stadial 1 (HS1) show low productivity conditions and a water column stratification. The Bølling/Allerød (B/A) is characterized by the northward extension of the Subtropical gyre favouring an increasing productivity that decreases during the Younger Dryas stadial (YD). The latter is characterized by a general cooling although less pronounced of that recorded for HS1. During the entire period, other than the major abundance of warm taxa suggesting a general prevalence of the IPC, a variable productivity and a water column stratification in particular at the beginning of the Holocene is shown.

这项研究的主要目的是重建沿伊比利亚西部边缘 (WIM) 发生的地表水动力学，将它们与副极地锋的位置和影响亚热带环流的动力学联系起来。该研究以 IODP Site U1385​​ (37°34.285'N; 10°7.562'W) 钙质浮游纳米生物古组合的变化为中心，可以重建区域地表水循环模式，以及地表古生产力波动和水̴ 25 和 0 ka 之间的柱分层。钙质微浮游生物古组合的突然变化发生在从冰期到间冰期的过渡时期。冰川条件 (25.3–11.5 ka) 的特点是冷的钙质微浮游生物物种占主导地位，表明普遍的葡萄牙洋流 (PC) 影响和热带辐合带 (ITCZ) 向南移动，这是北半球 (NH) 日照最小值的结果。而在间冰期（11.5-0.84 ka）期间验证的相反条件，由于整个地区的强烈伊比利亚极流（IPC）影响，有利于温暖物种的增殖。最后一次盛冰期 (LGM) 的特点是生产力适中，混合减少和中深营养线的建立。在 Heinrich stadial 1 (HS1) 期间副极地和副热带锋向南迁移显示出低生产力条件和水体分层。Bølling/Allerød (B/A) 的特点是亚热带环流向北延伸，有利于生产力增加，但在 Younger Dryas stadial (YD) 期间生产力下降。后者的特点是普遍冷却，尽管不如 HS1 记录的那么明显。在整个时期，除了表明 IPC 普遍流行的温暖类群的主要丰度外，还显示了可变生产力和水柱分层，特别是在全新世开始时。