Indian summer monsoon history during the last glacial cycle revealed by a loess sequence from the Tibetan Plateau

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology Pub Date : 2024-11-12 DOI:10.1016/j.palaeo.2024.112593

Pushuang Li , Shengli Yang , Yuanlong Luo , Li Liu , Yixiao Zhang , Weiming Liu , Jingzhao Zhang , Xuechao Xu , Chen Wen , Qiong Li

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Abstract

The Indian Summer Monsoon (ISM) has a profound influence on the environment and people of East Asia. However, despite its importance, the variability and dynamic mechanisms of the ISM remain inadequately understood. This study investigates the evolution of the ISM since the Last Interglacial by analyzing the well-preserved Cuoweng (CW) loess–paleosol sequence in the southeastern Tibetan Plateau. A robust chronological framework is established using quartz optically stimulated luminescence (OSL) dating and K-feldspar post-infrared infrared stimulated luminescence (pIRIR) dating. The history of the ISM over the past ∼135 ka is reconstructed based on multiple environmental proxies. The results indicate that the ISM experienced significant glacial–interglacial fluctuations during the last glacial cycle, exhibiting a strengthened monsoon during warm periods and a weakened one during cold periods. Additionally, suborbital-scale cyclic variations in the ISM during the marine isotope stage (MIS) 5 are revealed, with enhanced monsoon conditions during MIS 5a, 5c, and 5e and weakened conditions during MIS 5b and 5d. These findings suggest that the ISM variations are primarily influenced by a combination of high- and low-latitude forcing. This study provides new insights into the complex responses of the ISM to climate change, enhancing our understanding of its potential future changes.

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青藏高原黄土序列揭示的上一个冰川周期印度夏季季风历史

印度夏季季风（ISM）对东亚的环境和人类有着深远的影响。然而，尽管印度夏季季候风非常重要，但人们对其变异性和动态机制的了解仍然不足。本研究通过分析青藏高原东南部保存完好的翠峰（CW）黄土-页岩序列，研究了末次冰期以来印度夏季季风的演变。利用石英光学激发发光（OSL）测年法和K长石红外后激发发光（pIRIR）测年法建立了一个可靠的年代学框架。根据多种环境代用指标重建了 ISM 在过去 ∼135 ka 的历史。结果表明，在上一个冰川周期中，ISM经历了显著的冰川-冰川间波动，在温暖时期季风增强，在寒冷时期季风减弱。此外，研究还揭示了海洋同位素阶段（MIS）5 期间 ISM 的亚轨道尺度周期性变化，在 MIS 5a、5c 和 5e 期间季风条件增强，而在 MIS 5b 和 5d 期间季风条件减弱。这些发现表明，ISM的变化主要受到高纬度和低纬度作用力的共同影响。这项研究为了解ISM对气候变化的复杂反应提供了新的视角，加深了我们对其未来潜在变化的理解。

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

Palaeogeography, Palaeoclimatology, Palaeoecology 地学-地球科学综合

CiteScore

5.90

自引率

10.00%

发文量

398

审稿时长

3.8 months

期刊介绍： Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.