Wind dynamics in dust source areas are influenced by climate change on both regional and global scales. Northeastern arid central Asia is one of the most important sources of Asian dust. We conducted grain size analyses of the extracted quartz component of bulk samples from four Holocene aeolian sedimentary sequences in northeastern arid central Asia, in order to reconstruct variations in strength of near‐surface wind, and discussed the possible mechanism. X‐ray diffraction and geochemical analyses were also conducted. The results suggest that in the study area the mean grain size of the quartz component of aeolian sediments is a more reliable proxy for the strength of near‐surface wind and Siberian high‐pressure system. Stronger near‐surface wind and Siberian high‐pressure system occurred during the early to middle Holocene and subsequently their gradually weakened. Lower winter insolation, lower atmospheric CO₂ content, and remnant high‐latitude continental ice‐sheets resulted in relatively low winter temperatures in middle and high latitudes of the Northern Hemisphere during the early to middle Holocene. The lower winter temperatures indicate a stronger Siberian high‐pressure system, which may have been the cause of the stronger near‐surface winds. Due to increasing winter solar insolation and atmospheric CO₂ content, and the shrinking high‐latitude continental ice‐sheets, the Siberian high‐pressure system weakened in response to rising winter temperatures during the middle to late Holocene, likely resulting in decreased near‐surface wind strength.

中文翻译：

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全新世东北干旱中亚近地表风强度的变化

尘埃源地区的风动态在区域和全球范围内都受到气候变化的影响。东北干旱中亚是亚洲粉尘的最重要来源之一。为了重建近地表风强度的变化，我们对来自东北干旱中亚的四个全新世风成沉积序列的大块样品中提取的石英成分进行了粒度分析，并探讨了可能的机制。还进行了X射线衍射和地球化学分析。结果表明，在研究区中，风沙沉积物石英成分的平均晶粒度是近地表风和西伯利亚高压系统强度的更可靠替代。全新世早期至中期出现了更强的近地表风和西伯利亚高压系统，随后逐渐减弱。降低冬季日照，降低大气CO全新世初期至中期，北冰洋中高纬度地区的冰雪含量为₂，再加上残留的高纬度大陆冰原，导致冬季温度相对较低。较低的冬季温度表明西伯利亚高压系统更强，这可能是近地面风增强的原因。由于冬季日照强度和大气中CO ₂含量的增加，以及高纬大陆冰盖的收缩，西伯利亚高压系统由于全新世中期至晚期的冬季温度升高而减弱，可能导致近地表温度降低抗风强度。