Abstract Understanding the dynamics that drove past abrupt climate changes, such as the Dansgaard-Oeschger (DO) events, depends on combined proxy evidence from disparate archives. To identify leads, lags and synchronicity between different climate system components, independent and robust chronologies are required. Cryptotephrochronology is a key geochronological tool as cryptotephra horizons can act as isochrons linking disparate and/or distant records. Here, we investigated marine sediment core MD99-2284 from the Norwegian Sea to look for previously identified Greenland ice core cryptotephra horizons and define time-parallel markers between the archives. We explored potential secondary transport and depositional mechanisms that could hamper the isochronous integrity of such horizons. We identified six cryptotephra layers of which four correlate to previously known Greenland ice core horizons. None of those were identified in other marine cores and thus, this study contributes greatly to the North Atlantic tephra framework tripling the original amount of existing isochrons between ca. 25 and 60 ka b2k. The latter allow a synchronization between MD99-2284 and the Greenland ice cores between ca. 32–40 ka b2k, which is, in the North Atlantic, the shortest time-interval during the Last Glacial Period to be constrained by four independent tephra isochrons. These findings provide essential tephra-based evidence for synchronous and rapid oceanic and atmospheric temperature rises during the Greenland Stadial-Interstadial transitions. Furthermore, it enables us to estimate the average peak-duration of interstadial temperature overshoots at approximately 136 years. As such, this well-targeted high-resolution investigation successfully demonstrates the use of cryptotephra for geochronological purposes in the marine realm.

中文翻译：

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独立的年代学证据表明，在大约 10 年之间格陵兰岛的 stadial-interstadial 过渡期间，海洋和大气温度快速同步上升。32 和 40 ka b2k

摘要 了解推动气候突然变化的动力学，例如 Dansgaard-Oeschger (DO) 事件，取决于来自不同档案的综合代理证据。为了识别不同气候系统组件之间的领先、滞后和同步性，需要独立且稳健的年表。Cryptotephrochronology 是一个关键的地质年代学工具，因为cryptotephra 层位可以作为连接不同和/或遥远记录的等时线。在这里，我们调查了来自挪威海的海洋沉积物核心 MD99-2284，以寻找先前确定的格陵兰冰核隐藻层位并定义档案之间的时间平行标记。我们探索了可能阻碍此类层位等时完整性的潜在二次运输和沉积机制。我们确定了六个隐藻层，其中四个与先前已知的格陵兰冰芯层相关。这些都没有在其他海洋岩心中被发现，因此，这项研究对北大西洋火山灰框架的贡献很大，将大约 20 年之间现有等时线的原始数量增加了两倍。25 和 60 ka b2k。后者允许在 MD99-2284 和约 100 之间的格陵兰冰芯之间同步。32-40 ka b2k，这是北大西洋末次冰期期间受四个独立的火山岩等时线约束的最短时间间隔。这些发现为格陵兰体育场间过渡期间海洋和大气温度同步快速上升提供了必要的基于火山灰的证据。此外，它使我们能够估计大约 136 年的间质温度超调的平均峰值持续时间。因此，这项目标明确的高分辨率调查成功地证明了在海洋领域将隐翅目用于地质年代学目的。