Abstract Facies and geochemical analysis applied to marsh deposits are useful proxies for the reconstruction of aridity for the last millennia. The comparison of facies and geochemical records among cores from the Almenara and Benicasim marshes allows to identify changes in water level (Si/Al, Al, Ca) and salinity of the feeding waters (Mg/Al, Na/Al, S/Al). These changes, in turn, represent fluctuations in the position of the saline-fresh groundwater boundary, which can be related to variations in sea level and rainfall. For the last 4000 years, three events recording higher salinity conditions (ca. 3.4 ka BP, ca. 3 ka BP and ca. 1.8 ka BP) are noticeable in the record. Comparison to other studies around the Western Mediterranean basin allows us to correlate these events to arid episodes and to identify their forcing mechanisms. These aridity events are correlative to small falls in solar activity and Surface Sea Temperature (SST) during positive North Atlantic Oscillation (NAO) periods. Despite the small magnitude of these changes, the sensitivity of the system amplified the result providing a conspicuous signal.

中文翻译：

---

过去 4000 年西地中海沼泽（西班牙东部阿尔梅纳拉和贝尼卡西姆沼泽）的干旱事件

摘要 应用于沼泽沉积物的相和地球化学分析是重建过去千年干旱的有用代理。比较来自 Almenara 和 Benicasim 沼泽的岩心的相和地球化学记录，可以识别水位（Si/Al、Al、Ca）和补给水的盐度（Mg/Al、Na/Al、S/Al）的变化. 反过来，这些变化代表咸淡水边界位置的波动，这可能与海平面和降雨量的变化有关。在过去的 4000 年中，记录中记录了三个更高盐度条件（约 3.4 ka BP、约 3 ka BP 和约 1.8 ka BP）的事件。与围绕西地中海盆地的其他研究相比，我们可以将这些事件与干旱事件相关联，并确定其强迫机制。这些干旱事件与正北大西洋涛动 (NAO) 期间太阳活动和表层海温 (SST) 的小幅下降有关。尽管这些变化幅度很小，但系统的灵敏度放大了结果，提供了显着的信号。