Lake level variability on the Northeastern Tibetan Plateau linked to interaction between Westerlies and Asian monsoon since the last deglaciation

被引：0

作者：

Ma, Xueyun ^{[1
]}

Wei, Zhifu ^{[1
]}

Wang, Gen ^{[1
]}

Zhang, Ting ^{[1
]}

Zhang, Pengyuan ^{[4
]}

Liang, Kaikang ^{[1
,3
]}

Guo, Zengguang ^{[2
,3
]}

Li, Shangkun ^{[1
,3
]}

Zhang, Xiaomei ^{[1
,3
]}

Chen, Jianzhen ^{[1
,3
]}

Li, Zelong ^{[1
,3
]}

He, Wei ^{[1
]}

Wang, Yongli ^{[2
]}

机构：

[1] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources Explorat & Evaluat, Lanzhou 730000, Gansu, Peoples R China

[2] Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher & Environm Coevolut, Beijing 100029, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[4] China Natl Petr Corp, Res Inst Petr Explorat & Dev, Key Lab Petr Geochem, Beijing 100083, Peoples R China

来源：

CATENA | 2025年 / 250卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Lake level; Asian monsoon; Westerly; Tibetan Plateau; delta; 13Corg; CARBON ISOTOPIC COMPOSITION; WAX N-ALKANES; HOLOCENE MOISTURE; CLIMATIC CHANGES; ORGANIC-MATTER; HURLEG LAKE; SUMMER MONSOON; QINGHAI LAKE; QAIDAM BASIN; EVOLUTION;

D O I：

10.1016/j.catena.2025.108739

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Organic carbon isotopes (delta 13Corg) in lake sediments have been recognized as a potential indicator of lake level on the Tibetan Plateau (TP) over the past decades. However, debates persist regarding the factors influencing delta 13Corg values and their sensitivity to lake level fluctuations. This study systematically evaluated the factors contributing to delta 13Corg variations and assessed the reliability of delta 13Corg as a proxy for lake level, utilizing sediments from Hurleg Lake on the northeastern Tibetan Plateau as a case study. Initially, we analyzed the delta 13Corg of surface lake sediments, aquatic plants, and terrestrial plants samples, and compared them with the delta 13Corg in the sediment core of HL18-3. Combing with the compound-specific n-alkanes isotopes, Paq and C/N ranges, the results demonstrated that the organic matter (OM) source in Hurleg Lake was dominated by both aquatic and terrestrial plants. Further analysis of the relationship between delta 13Corg and established lake level indicators revealed that delta 13Corg in lake sediments was capable of signifying changes in lake level, reflecting variabilities of the regional effective humidity. Our study distinguishes itself from previous research by identifying that the negative delta 13Corg values from C3 plants substantially contribute to the depletion of delta 13Corg of lake sediments. Ultimately, we reconstructed the lake level history since 14.1 cal kyr BP, and reviewed the general lake level variations on the northeastern TP. The results indicated that the lake level fluctuations on the northeastern TP have exhibited a relatively consistent pattern since the termination of the Last Deglacial. A typical high lake level on the northeastern TP occurred during the late Holocene, which was induced by enhanced Westerly. Collectively, the source and intensity of water input, along with regional temperature and evaporation changes, are pivotal factors affecting changes in lake level fluctuations.

引用

页数：16

共 83 条

[1] MAGNETIC-SUSCEPTIBILITY EVIDENCE OF MONSOON VARIATION ON THE LOESS PLATEAU OF CENTRAL CHINA DURING THE LAST 130,000 YEARS [J].