Atmospheric dust has important influences on atmospheric circulation, global biogeochemical cycles, and hydrological processes. However, understanding the history of dust storms on the Tibetan Plateau (TP) remains challenging due to the lack of suitable geological archives. Lakes in dust-influenced regions act as dust repositories, offering the opportunity to trace the history of dust emissions and eolian activity. Here we present a synthesis of eolian activity on the eastern TP covering the past 15,000 years. It is based on records of grain size and n-alkanes from a sediment core from Gahai lake, which we combined with published pollen and other records from the same core, to reconstruct variations in surface runoff and eolian activity in this region. Our results indicate a correlation between vegetation conditions and eolian activity during different periods. Increased eolian activity occurred during the transition from the last deglaciation to the early Holocene, due to suboptimal vegetation conditions. Between 7.5 and 3.5 cal ka BP (ka), higher moisture levels resulted in the dominance of arboreal vegetation, which suppressed eolian activity. However, after 3.5 ka a sustained intensification of eolian activity occurred in the Gahai area, which was linked to decreasing vegetation cover, reduced regional humidity, and growing human impacts, especially in the eastern plateau, in southern Gansu. In recent decades, human interventions have suppressed eolian activity. Additionally, a ∼ 1435-year cyclicity in our record, and other regional records, suggests a link between increased eolian activity on the eastern TP and ice-rafting events in the North Atlantic. Generally, Holocene eolian dynamics were primarily influenced by the regional vegetation and climatic conditions which were controlled by the atmospheric circulation. However, in the late Holocene, climatic shifts and human influences had a synergistic effect which intensified the eolian activity, highlighting the important role of humans on recent dust dynamics in this region.

中文翻译：

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15 cal ka BP 以来青藏高原东部风成岩活动的湖泊沉积物记录


大气尘埃对大气环流、全球生物地球化学循环和水文过程有重要影响。然而，由于缺乏合适的地质档案，了解青藏高原 （TP） 沙尘暴的历史仍然具有挑战性。受沙尘影响地区的湖泊充当沙尘库，为追踪沙尘排放和风沙活动的历史提供了机会。在这里，我们介绍了过去 15,000 年高原东部的风成活动综合。它基于来自加海湖沉积物岩芯的粒度和正烷烃的记录，我们将其与已发表的花粉和来自同一岩芯的其他记录相结合，以重建该地区地表径流和风成岩活动的变化。我们的结果表明，不同时期植被条件与风成活动之间存在相关性。由于植被条件欠佳，在从末次冰川消融到全新世早期的过渡期间，风成活动增加。在 7.5 至 3.5 cal ka BP （ka） 之间，较高的水分含量导致树栖植被占据主导地位，从而抑制了风成果活动。然而，在 3.5 ka 之后，Gahai 地区发生了风成活动的持续增强，这与植被覆盖率降低、区域湿度降低和人类影响增加有关，尤其是在甘肃南部的东部高原。近几十年来，人类干预抑制了风沙菌的活动。此外，我们的记录和其他地区记录中 ∼ 1435 年的周期性表明，高原东部风成活动的增加与北大西洋的冰上漂流事件之间存在联系。 一般来说，全新世风成动力学主要受区域植被和气候条件的影响，这些植被和气候条件受大气环流控制。然而，在全新世晚期，气候变化和人类影响产生了协同效应，加剧了风成活动，突出了人类对该地区近期尘埃动态的重要作用。