The tropical Asian regions are particularly prone to catastrophic droughts due to high temperature and evaporation and their sensitivity to variable oceanic‐atmospheric circulation. The extent to which future global warming may intensify droughts in this populous region is a matter of utmost concern. Palaeoclimatic data can help inform scientists learn more about the temporal patterns and drivers of monsoon change over geological timescales. In this paper, we present a new 8,200 year biomarker record preserved in the annually laminated sediments of Maar Lake Twintaung, Myanmar. The δ¹³C_27‐35 sedimentary record is mainly derived from leaf wax lipids in the lake catchment, which is presently dominated by C₃ vegetation in the modern lake catchment. The δ¹³C_27‐35 is mainly regulated by plant physiological and biochemical responses to drought stress and, as such, can be used as a proxy of past changes in moisture. The δ¹³C_27–35 record reveals distinct decadal‐to‐centennial‐scale droughts superimposed on a trend of gradually decreasing summer monsoon intensity from the mid‐Holocene to late Holocene. Within the limits of the dating uncertainties, these decadal‐to‐centennial‐scale droughts are found to be well correlated with the southward shift of the Intertropical Convergence Zone. It highlights thepimportance of the Intertropical Convergence Zone shift (tropical monsoon trough) in regulating monsoon rainfall in the region. In addition, most of the droughts are likely to be linked with active volcanism and solar minima and suggest a coupled process between external drivers and internal climate dynamics.

中文翻译：

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缅甸Maar Lake Twintaung记录的最近8,200年的干旱周期

由于高温和蒸发及其对变化的海洋-大气环流的敏感性，亚洲热带热带地区特别容易发生灾难性干旱。未来的全球变暖可能在多大程度上加剧这个人口稠密地区的干旱，这是一个最令人关注的问题。古气候数据可以帮助科学家了解更多有关地质时间尺度上季风变化的时间模式和动因。在本文中，我们提出了一个新的8200年生物标记记录，该记录保存在缅甸Maar Lake Twintaung的年积沉积物中。的δ ¹³ C ^ _27-35沉积记录主要是从叶蜡脂质在湖集水，其目前被C支配衍生₃植被在现代湖集水。δ¹³ C _27-35主要受植物对干旱胁迫的生理和生化反应的调节，因此可以用作过去水分变化的替代指标。的δ ¹³ C ^ _27-35记录表明，从全新世中期到全新世晚期，夏季季风强度逐渐降低，叠加了明显的年代际至百年干旱。在年代不确定性的范围内，发现这些年代际至百年尺度的干旱与热带辐合带的南移具有很好的相关性。它突出了热带辐合带带变化（热带季风谷）在调节该地区季风降雨中的重要性。此外，大多数干旱很可能与活跃的火山活动和日照最低有关，并表明外部驱动力和内部气候动态之间存在耦合过程。