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干旱区地理 ›› 2026, Vol. 49 ›› Issue (8): 1687-1699.doi: 10.12118/j.issn.1000-6060.2025.648 cstr: 32274.14.ALG2025648

• 地表过程研究 • 上一篇    下一篇

新疆罗布泊地区33.9 ka BP以来沉积物粒度记录的环境演化过程

易庭楠1,2(), 常宏1(), 罗家馨1,2, 龙雪颖1, 马宝成1, 赵亮亮1   

  1. 1 中国科学院地球环境研究所黄土科学全国重点实验室陕西 西安 710061
    2 中国科学院大学北京 100049
  • 收稿日期:2025-10-18 修回日期:2025-11-07 出版日期:2026-08-25 发布日期:2026-08-21
  • 通讯作者: 常宏(1970-),男,博士,研究员,主要从事第四纪地质学、磁性地层学与盆地分析等方面的研究. E-mail: changh@loess.llqg.ac.cn
  • 作者简介:易庭楠(1996-),女,博士研究生,主要从事第四纪地质等方面的研究. E-mail: yitn@ieecas.cn
  • 基金资助:
    国家自然科学基金项目(42372221);科技部第二次青藏高原综合科学考察研究项目(2019QZKK0707)

Grain-size record of environmental evolution in the Lop Nur in Xinjiang since 33.9 ka BP

YI Tingnan1,2(), CHANG Hong1(), LUO Jiaxin1,2, LONG Xueying1, MA Baocheng1, ZHAO Liangliang1   

  1. 1 State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, Shaanxi, China
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2025-10-18 Revised:2025-11-07 Published:2026-08-25 Online:2026-08-21

摘要:

中纬度地区西风气候系统的变化过程对揭示高-低纬气候相互作用机制具有重要意义。塔里木盆地位于北半球中纬度,是受西风环流显著影响的典型干旱区,其气候变化是理解北大西洋与亚洲季风系统耦合关系的关键区域。目前该区域水热配置模式与全球气候系统协同演化尚存争议。分析新疆罗布泊罗北凹地ZK0205孔0.00~16.10 m沉积物样品,识别出3个对环境变化敏感的粒级组分:黏粒(<5 μm)、粉砂(5~63 μm)和砂粒(>63 μm)。结合流域沉积规律与现代观测,3个组分分别指示径流变化、风尘活动强度与水动力条件。基于加速器质谱碳十四测年的年代框架,重建了研究区33.9 ka BP以来的环境演化序列。结果表明:(1) 罗布泊地区在深海氧同位素阶段3气候相对湿润,深海氧同位素阶段2转为干旱,全新世整体呈现暖干特征,揭示了晚更新世以来水热组合的阶段性转变。(2) 粒度组分变化与北格陵兰冰芯项目冰芯氧同位素比值记录对比显示,该区域较好地响应了北半球千年尺度气候事件,其响应模式随气候背景发生系统性转变。(3) 罗布泊位于西风核心区与边缘过渡带的交界处,其气候演化不仅受全球气候背景制约,同时受到西风与季风系统的共同调制,导致区域气候模式呈现高度复杂性。

关键词: 罗布泊, 湖泊沉积, 粒度分析, 地层组成, 中亚干旱区

Abstract:

The evolution of the mid-latitude westerly climate system is crucial for understanding interaction mechanisms between high- and low-latitude climate systems. The Tarim Basin, located in the typical arid to semiarid zone influenced by the Northern Hemisphere westerlies, serves as a key region for deciphering the coupling between the North Atlantic and Asian monsoon systems. However, debates remain regarding its moisture-heat configuration patterns and their co-evolution with global climate systems. This study analyzes grain-size fractions from 295 samples of the 0.00-16.10 m sediment core ZK0205 in the Luobei Depression of Lop Nur, Xinjiang, China. Three environmentally sensitive grain-size fractions are identified: Clay (<5 μm), silt (5-63 μm), and sand (>63 μm), which are interpreted as indicators of runoff input, aeolian activity intensity, and strong hydrodynamics, respectively, based on sedimentary characteristics of arid lake basins and modern observational data. Supported by an AMS 14C chronological framework, the environmental evolution of the study area since 33.9 ka BP was reconstructed. The main findings are as follows: (1) The Lop Nur region experienced humid conditions during MIS3, which shifted to arid conditions during MIS2. Overall, the Holocene was characterized by warm and dry conditions, revealing phased changes in moisture-heat configuration on a millennial scale. (2) Comparison between grain-size fraction variations and the Greenland NGRIP ice core δ18O record indicates that the region responded sensitively to Northern Hemisphere millennial-scale climate events. Notably, the response pattern shifted systematically with background climate states (warm periods MIS1/MIS3 against cold periods MIS2). (3) Located at the boundary between the core westerlies domain and its transitional margin, the climate evolution of Lop Nur was constrained by global climatic background conditions and jointly influenced by the westerlies and Asian monsoon systems. This interplay results in high complex regional climatic variability.

Key words: Lop Nur, lacustrine deposit, grain-size analysis, stratigraphic composition, arid Central Asia