现代地质2024，Vol.38Issue(2)：477-486,10.DOI:10.19657/j.geoscience.1000-8527.2023.110
青藏高原南部玛不错湖面变化及其对气候环境的指示
Lake Level Fluctuations and Indications of Climate Changes of the Mabucuo Lake in the Southern Tibetan Plateau
摘要
Abstract
The Mabucuo lake,located in the middle of the southern Tibetan valley,is sensitive to climate chan-ges mainly because of that the lake is affected by the Indian summer monsoon and westerlies.Multi-temporal re-mote sensing images provide the characteristics of lake level fluctuation in recent years,reflecting the regional climate changes.The sediments of lake shorelines and lake terraces provide ideal materials for studying the changes of lake level,which is used to understand the history of regional paleoclimate and the fluctuations of lake level.Remote sensing and image interpretations,Accelerator Mass Spectrometry(AMS)14C dating,and Digital Elevation Model(DEM)data were applied to investigate the elevation and the chronology of lake shore-lines or lake terraces in the north part of the Mabucuo lake.Combining with the lake level changes by the sedi-mentary sequence of the lake terrace section,the lake level fluctuation of Mabucuo since Late Pleistocene is re-constructed.Period S7-S4,before 14,256-13,984 a BP,Mabucuo was a unified great lake with southern Galacuo and Duoqingcuo.The lake level of Mabucuo gradually decreased from S7 to S4 stage.Mabucuo,Duo-qingcuo and Galacuo have been separated into three independent lakes.The lake level of Mabucuo gradually raised from S4 to S3 stage,and the separated lakes reunited to one great lake.This great lake only lasted a short time.Period S3-S1,after 14,256-13,984 a BP,Mabucuo had become an independent lake again.The lake level of Mabucuo gradually decreased from S3 to S1.In summary,the lake level of Mabucuo has experienced a process from high to low,then to high,and then to low since Late Pleistocene.The lake level was mainly con-trolled by regional atmospheric precipitation and glacier meltwater,which reflected the strength of Indian mon-soon and the global climate change.During the last decade,the lake level of Mabucuo interpreted by the remote sensing evidence shows that Mabucuo has shrunk from 2013 to 2015 and expanded from 2016 to 2018,which reflected the trend of warm and humid climate in the middle of southern Tibetan valley.This study will be great significance to understand the trends of climatic and environmental changes in the Tibetan plateau.关键词
青藏高原/玛不错/遥感影像/湖岸堤/湖平面/古环境变化Key words
Tibetan plateau/Mabucuo Lake/remote sensing image/lake shoreline/lake level/climate change分类
天文与地球科学引用本文复制引用
韩建恩,邵兆刚,张雪锋,余苇,孟庆伟,余佳,王津,朱大岗..青藏高原南部玛不错湖面变化及其对气候环境的指示[J].现代地质,2024,38(2):477-486,10.基金项目
国家自然科学基金项目(41772381) （41772381）
第二次青藏高原科学考察专题"帕米尔—西昆仑及新藏公路沿线断裂活动习性综合考察研究"项目(DZLXJK201710) （DZLXJK201710）
中国地质科学院地质力学研究所基本科研业务费项目(所科研62). （所科研62）
