Abstract Thick and widespread loess deposits in southern Tajikistan provide insight into the regional climatic changes in arid Central Asia (ACA) during the Quaternary. However, because of the lack of robust chronological constraints, the environmental implications of these deposits are not yet fully understood. Here, we report a detailed medium-grained quartz optically stimulated luminescence (OSL) dating analysis on a loess sequence deposited since the Lateglacial in southern Tajikistan. The single-aliquot regeneration (SAR) and standardized growth curve (SGC) methods were used for equivalent dose determination. Quartz OSL measurements showed that both the SAR and SGC methods can be used for equivalent dose determination for Tajik loess. On the basis of the obtained OSL ages, we reconstructed the dust accumulation rates and mass accumulation rates. Our results show that the dust flux continued to decline whereas the precipitation increased stepwise after the end of the Last Glacial Maximum. Changes in the dust flux and precipitation in ACA were sensitive to the gradual warming since the Lateglacial.

中文翻译：

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塔吉克斯坦黄土的石英光激发光测年及其对晚冰期以来干旱中亚的古气候影响

摘要 塔吉克斯坦南部厚而广泛的黄土沉积物提供了第四纪干旱中亚 (ACA) 区域气候变化的洞察力。然而，由于缺乏强有力的时间顺序限制，这些沉积物的环境影响尚未完全了解。在这里，我们报告了对塔吉克斯坦南部晚冰期以来沉积的黄土序列的详细中粒石英光学受激发光 (OSL) 测年分析。单等分再生 (SAR) 和标准化生长曲线 (SGC) 方法用于确定等效剂量。石英 OSL 测量表明，SAR 和 SGC 方法均可用于塔吉克黄土的等效剂量测定。在获得的 OSL 年龄的基础上，我们重建了灰尘积累率和质量积累率。我们的研究结果表明，末次盛冰期结束后，沙尘通量继续下降，而降水量逐步增加。ACA沙尘通量和降水的变化对晚冰期以来的逐渐变暖很敏感。