Upstream moisture sources and circulation patterns controls Asian monsoon hydroclimate over the past 20,000 years

IF 3.3 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL
Jian Zhang , Ming-Qiang Liang , Jun-Yun Li , Yao Wu , Yan-Xia Xue , Wen-Jun Sun , Xiang-Zhuo Liu , Jin-Ke Chen , Chao-Jun Chen , Ting-Yong Li
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Abstract

Speleothem oxygen isotope records (δ18O) from caves in the Asian monsoon region have been widely utilized to reconstruct paleo-monsoon variability. However, interpreting these records remains challenging due to conflicting hypotheses about their relationship with Asian Summer Monsoon (ASM) strength and regional rainfall patterns. In this study, we analyzed 15 cave stalagmite δ18O records collected across East and South Asia, covering the last 20,000 years. Our analysis focuses on key climatic events, including Heinrich Stadial 1 (HS1), the Bølling-Allerød warm period (BA), and the Younger Dryas (YD), to explore the driving force of Asian summer monsoons from both high-latitude North Atlantic climate and lower-latitudes atmospheric circulation patterns. The results revealed that speleothem δ18O variations were predominantly influenced by shifts in upstream moisture sources, particularly from low-latitude regions in the Indian and Pacific Oceans, as evidenced by both observational data and model simulations. We demonstrated that δ18O records from Chinese caves reflect not only local rainfall dynamics but also broader influences from upstream moisture sources.
上游水分来源和环流模式控制着过去2万年亚洲季风水文气候
亚洲季风区洞穴的氧同位素(δ18O)记录已被广泛用于重建古季风变率。然而,由于这些记录与亚洲夏季风(ASM)强度和区域降雨模式的关系存在相互矛盾的假设,解释这些记录仍然具有挑战性。在这项研究中,我们分析了过去2万年在东亚和南亚收集的15个洞穴石笋δ18O记录。本文以海因里希第1次增温期(HS1)、b ølling- allero ød暖期(BA)和新仙女木期(YD)为研究对象,从高纬北大西洋气候和低纬大气环流两方面探讨亚洲夏季季风的驱动力。结果表明,岩石层δ18O变化主要受上游水汽源变化的影响,特别是来自印度洋和太平洋低纬度地区的水汽源变化。研究表明,中国洞穴的δ18O记录不仅反映了当地的降雨动态,还反映了上游水分来源的广泛影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Quaternary Science Reviews
Quaternary Science Reviews 地学-地球科学综合
CiteScore
7.50
自引率
15.00%
发文量
388
审稿时长
3 months
期刊介绍: Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.
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