NOAA/WDS Paleoclimatology - Cariaco Basin, Venezuela, 600-kyr Scanning-XRF Sedimentary Mo Data

A ~600 kyr long scanning X-ray fluorescence record of redox variability from the Cariaco Basin, Venezuela, provides insight into rapid climate change in the tropics over the past five glacial-interglacial cycles. Variations in the sediment accumulation of the redox-sensitive element molybdenum (Mo) can be linked to changes in Intertropical Convergence Zone migration and reveal that millennial-scale variability is a persistent feature of tropical climate over the past 600 kyr, including during periods of interglacial warmth. This geochemical record supports the idea that high-frequency tropical climate variability is not controlled solely by ice volume changes, with implications for the role of high-latitude forcing of Intertropical Convergence Zone position and tropical hydrology on millennial timescales.

来自委内瑞拉卡里亚科盆地、时长约60万年的扫描X射线荧光（scanning X-ray fluorescence）记录，为深入理解过去5个冰期-间冰期旋回内的热带快速气候变化提供了关键依据。该记录中氧化还原敏感元素钼（Mo）的沉积累积变化，可与热带辐合带（Intertropical Convergence Zone）的迁移活动相联系，并揭示出千年尺度气候变率是过去60万年热带气候的持续特征，涵盖间冰期温暖时段。这一地球化学记录佐证了一个核心观点：高频热带气候变率并非仅由冰量变化主导，该结论对理解千年时间尺度上，高纬度强迫对热带辐合带位置与热带水文的调控作用具有重要启示。