Abstract The evolution of Holocene moisture in semiarid and arid regions of Central Asia is key to understanding changes in current and future water resources, and has been a hotly debated topic in the past few decades. Central Asian loess deposits have shown potential as records of past moisture changes, particularly during the Holocene. Here, the variations in effective moisture during the Holocene in the semiarid regions of the Yili Basin, Central Asia, are obtained from three loess sections. Reliable chronologies were constructed using 26 quartz optically stimulated luminescence (OSL) ages. The strengthening pedogenesis, steady increases in magnetic susceptibility, and continuous decreases in mean grain size in the three loess sections all suggest that effective moisture continuously increased throughout the Holocene, indicating a dry early Holocene, a moderately humid middle Holocene, and a wet late Holocene. Rainfall carried by the Asian summer monsoon and the Westerlies contributes to the moisture changes in Central Asia. However, considering the dominance of evaporation over rainfall in controlling aridity-humidity shifts in this region, the continuous weakening of evaporation caused by a decrease in Northern Hemisphere summer insolation and associated atmospheric temperatures is primarily responsible for the wetting trend throughout the Holocene in the semiarid regions of the Yili Basin.

中文翻译：

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中亚伊犁盆地半干旱地区全新世有效水分增加：来自黄土剖面的证据

摘要 中亚半干旱和干旱地区全新世水分的演变是了解当前和未来水资源变化的关键，在过去几十年中一直是一个热门话题。中亚黄土沉积物已显示出作为过去水分变化记录的潜力，特别是在全新世期间。在这里，中亚伊犁盆地半干旱地区全新世有效水分的变化是从三个黄土剖面获得的。使用 26 个石英光学受激发光 (OSL) 年龄构建了可靠的年表。三个黄土剖面的成土作用加强、磁化率稳步上升、平均粒度持续减小，均表明有效水分在整个全新世持续增加，表明干燥的早期全新世、适度潮湿的中期全新世和潮湿的晚期全新世。亚洲夏季风和西风带的降雨导致了中亚的水分变化。然而，考虑到蒸发在控制该地区的干旱-湿度变化方面占主导地位，北半球夏季日照和相关大气温度的减少导致蒸发的持续减弱是整个全新世半干旱地区湿润趋势的主要原因。伊犁盆地地区。