Inland Asia is a major global source of dust and the dust transport from this region has global implications. However, the processes and forcing mechanisms of dust activity in inland Asia during the Holocene are still debated due to the lack of high-quality records with accurate dating, unambiguous dust signals, and a high resolution. Here we present a well-dated record of dust activity based on the Ti content of the sediments of Shuanghu Lake, in the southern Altai Mountains, with a ∼ 15-yr-resolution and covering the entire Holocene. This record shows a gradual decrease in dust intensity during ∼11.7–6 thousand years ago (ka), followed by a persistent increase since ∼6 ka. Frequent dust events are also evident, lasting hundreds of years, and are superimposed on the millennial-scale trend, corresponding to the nine North Atlantic Bond events. We propose that the millennial-scale trend of dust activity was primarily influenced by variations in the mid-latitude Westerlies, while the dust events on the centennial scale were driven primarily by a strengthened East Asian winter monsoon. Overall, this study provides a reliable, high-resolution record of Holocene dust activity in inland Asia, and it updates the previous view that dust activity in this region was solely controlled by the mid-latitude Westerlies or the Siberian High. Our findings contribute to an improved understanding of global dust transport with implications for predicting future dust activity in this region.

中文翻译：

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亚洲内陆全新世尘埃活动由中纬度西风和东亚冬季季风驱动


亚洲内陆是全球主要的粉尘来源，从该地区运来的粉尘具有全球影响。然而，由于缺乏具有准确测年、明确尘埃信号和高分辨率的高质量记录，全新世期间亚洲内陆沙尘活动的过程和强迫机制仍然存在争议。在这里，我们根据阿尔泰山脉南部双湖沉积物的 Ti 含量，以 ∼ 15 年的分辨率，涵盖了整个全新世，提供了一份日期明确的尘埃活动记录。该记录显示，在 11.7-6000 年前 （ka） 期间，尘埃强度逐渐降低，随后自 ∼6 ka 以来持续增加。频繁的沙尘事件也很明显，持续了数百年，并叠加在千年尺度的趋势上，对应于九次北大西洋邦德事件。我们提出，千年尺度的沙尘活动趋势主要受中纬度西风变化的影响，而百年尺度的沙尘事件主要由增强的东亚冬季季风驱动。总体而言，这项研究为亚洲内陆全新世尘埃活动提供了可靠、高分辨率的记录，它更新了之前的观点，即该地区的尘埃活动完全由中纬度西风或西伯利亚高压控制。我们的研究结果有助于更好地了解全球尘埃传输，对预测该地区未来的尘埃活动具有重要意义。