The occurrence of rapid last glacial temperature shifts in both Greenland ice and subpolar marine sediment cores, so-called Dansgaard-Oeschger (D-O) cycles, is evidence of a tight regional climate connectivity in these northern latitudes. By contrast, processes behind high-to-low-latitude teleconnections during the D-O cycles are less well understood, due to imprecisions in cross-dating marine and ice core records and a general lack of solid multi-proxy records from the tropical region. Here we aim to study the response of the tropical ocean-atmosphere system to D-O variability by using a sediment core from the southern Caribbean Sea, located under the direct influence of the Intertropical Convergence Zone (ITCZ) and the Atlantic meridional overturning circulation (AMOC). During D-O cycles, abrupt shifts in the deposition of fine-grained terrigenous material sourced from the Orinoco and Amazon rivers are recognized. These sedimentary changes were associated with fluctuations in both the ITCZ location and the AMOC strength through their respective influence on the hydroclimate of northern South America and strength of ocean currents delivering fluvial material to the study site. Stable oxygen isotope data further suggest increase in the upper ocean temperatures in the southeastern Caribbean Sea during stadial events. As these warming trends correlate with Antarctic temperatures, they seem to contain imprints of the bipolar seesaw and AMOC variability, demonstrating that our core location was influenced by processes prevalent in both hemispheres.

格陵兰冰和次极地海洋沉积物核心中末次冰期温度的快速变化，即所谓的 Dansgaard-Oeschger (DO) 循环，是这些北纬地区紧密的区域气候连通性的证据。相比之下，由于海洋和冰芯记录的交叉日期不精确以及热带地区普遍缺乏可靠的多代理记录，对 DO 循环期间高到低纬度遥相关背后的过程了解较少。在这里，我们的目标是通过使用位于热带辐合带 (ITCZ) 和大西洋经向翻转环流 (AMOC) 直接影响的加勒比海南部的沉积物核心来研究热带海洋 - 大气系统对 DO 变化的响应. 在 DO 循环期间，人们认识到源自奥里诺科河和亚马逊河的细粒陆源物质沉积的突然变化。这些沉积变化与 ITCZ 位置和 AMOC 强度的波动有关，因为它们各自对南美洲北部的水文气候和将河流物质输送到研究地点的洋流强度产生影响。稳定的氧同位素数据进一步表明，在静态事件期间，加勒比海东南部的上层海洋温度会升高。由于这些变暖趋势与南极温度相关，它们似乎包含两极跷跷板和 AMOC 变异的印记，表明我们的核心位置受到两个半球普遍存在的过程的影响。这些沉积变化与 ITCZ 位置和 AMOC 强度的波动有关，因为它们各自对南美洲北部的水文气候和将河流物质输送到研究地点的洋流强度产生影响。稳定的氧同位素数据进一步表明，在静态事件期间，加勒比海东南部的上层海洋温度会升高。由于这些变暖趋势与南极温度相关，它们似乎包含两极跷跷板和 AMOC 变异的印记，表明我们的核心位置受到两个半球普遍存在的过程的影响。这些沉积变化与 ITCZ 位置和 AMOC 强度的波动有关，因为它们各自对南美洲北部的水文气候和将河流物质输送到研究地点的洋流强度产生影响。稳定的氧同位素数据进一步表明，在静态事件期间，加勒比海东南部的上层海洋温度会升高。由于这些变暖趋势与南极温度相关，它们似乎包含两极跷跷板和 AMOC 变异的印记，表明我们的核心位置受到两个半球普遍存在的过程的影响。