The flux of terrestrial material from the continents to the oceans links the lithosphere, hydrosphere, and biosphere through physical and biogeochemical processes, with important implications for Earth's climate. Quantitative estimates of terrigenous fluxes from sources such as rivers, aeolian dust, and resuspended shelf sediments are required to understand how the processes delivering terrigenous material respond to and are influenced by climate. We compile thorium‐230 normalized ²³²Th flux records in the tropical Atlantic to provide an improved understanding of aeolian fluxes since the Last Glacial Maximum (LGM). By identifying and isolating sites dominated by aeolian terrigenous inputs, we show that there was a persistent meridional gradient in dust fluxes in the eastern equatorial Atlantic at the LGM, arguing against a large southward shift of the intertropical convergence zone during LGM boreal winter. The ratio of LGM to late‐Holocene ²³²Th fluxes highlights a meridional difference in the magnitude of variations in dust deposition, with sites <10°N showing larger changes over time. This supports an interpretation of increased trade wind strength at the LGM, potentially combined with differential changes in soil moisture and reductions in higher altitude summer winds. Our results also highlight the persistent importance of continental margins as sources of high terrigenous flux to the open ocean. This is especially evident in the western tropical Atlantic, where study locations reveal the primary influence of the South American continent up to >700 km away, characterized by ²³²Th fluxes approximately twice as large as aeolian‐dominated sites in the east.

中文翻译：

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末次冰期以来的热带大西洋风尘和陆源通量的空间分布

陆地物质从大陆到海洋的流动通过物理和生物地球化学过程将岩石圈，水圈和生物圈联系在一起，这对地球的气候具有重要意义。需要对来自河流，风尘和重悬架子沉积物等来源的陆源通量进行定量估计，以了解输送陆源物质的过程如何响应气候并受气候影响。我们编译thorium-230归一化²³²自最后一次冰河极大期（LGM）以来，热带大西洋的通量记录提供了对风向通量的更好的了解。通过识别和隔离以风成陆生输入为主的站点，我们表明，LGM北部冬季，赤道东大西洋在LGM处存在持续的子午通量梯度，这与热带辐合带向南的大位移有关。LGM与晚全新世的比例²³²通量突显出尘埃沉积变化幅度的子午差，<10°N的位点随时间变化较大。这支持了LGM贸易风强度增加的解释，并可能与土壤水分的差异变化和较高海拔的夏季风的减少相结合。我们的研究结果还强调了大陆边缘作为向陆路开放的高陆源通量来源的持续重要性。这在西部热带大西洋尤为明显，在该地区的研究地点揭示了南美洲大陆的主要影响力，该南美洲大陆距离> 700 km，其特征是²³² Th通量大约是东部风沙为主位点的两倍。