朱少航^1,3,,
朱立平^1,2,3,,,
王君波^1,2,
鞠建廷¹,
马庆峰¹,
陈浩^1,3,
许腾^1,3,
开金磊^1,3
1. 中国科学院青藏高原研究所, 中国科学院青藏高原环境变化与地表过程实验室, 北京 100101
2. 中国科学院青藏高原地球科学卓越创新中心, 北京 100101
3. 中国科学院大学, 北京 100049

基金项目: 中国科学院(A类)战略性先导科技专项项目(批准号:XDA20020102)、国家自然科学基金重点项目(批准号:41831177)、国家重点基础研究发展计划项目(批准号:2018YFB05050000)和中国科学院"十三五"信息化建设项目(批准号:XXH13505-06)共同资助


详细信息

作者简介: 朱少航, 男, 28岁, 硕士研究生, 湖泊沉积与环境变化研究, E-mail:zhush@itpcas.ac.cn

通讯作者: 朱立平, E-mail:lpzhu@itpcas.ac.cn

中图分类号: P941.78;P534.63⁺2;P532

收稿日期:2019-02-01
修回日期:2019-03-28
刊出日期:2019-05-30

Environmental changes reflected by core sediments since late glacial in Mapam Yumco, southwest Tibet of China

Zhu Shaohang^1,3,,
Zhu Liping^1,2,3,,,
Wang Junbo^1,2,
Ju Jianting¹,
Ma Qingfeng¹,
Chen Hao^1,3,
Xu Teng^1,3,
Kai Jinlei^1,3
1. Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101
2. CAS Center for Excellence in Tibetan Plateau Earth System, Beijing 100101
3. University of Chinese Academy of Sciences, Beijing 100049


More Information

Corresponding author: Zhu Liping,E-mail:lpzhu@itpcas.ac.cn

MSC: P941.78;P534.63⁺2;P532

--> Received Date: 01 February 2019
Revised Date: 28 March 2019
Publish Date: 30 May 2019


摘要
摘要:玛旁雍错位于青藏高原西南部，是研究印度季风演化的理想地区之一。利用活塞采样器在玛旁雍错75 m水深处获取了一根4.69 m长岩芯，利用²¹⁰Pb和AMS¹⁴C测年确定了岩芯的年代，根据元素含量（XRF扫描）、总有机碳（TOC）、总无机碳（TIC）和总氮（TN）等代用指标，重建了该地区14 cal.ka B.P.以来气候环境变化。结果显示，冰消期（14~12 cal.ka B.P.），TOC和TIC含量变化显示了湖区环境整体上较为暖湿；12.0~11.4 cal.ka B.P.，径流明显减弱，可能是新仙女木事件的反映；早中全新世（11.4~3.4 cal.ka B.P.），湖区环境整体上以暖湿为主，气候有所波动，出现了两次冷事件（10.2~9.8 cal.ka B.P.和8.2 cal.ka B.P.左右），7.4~6.6 cal.ka B.P.，出现了一个暖时期；晚全新世（3.4~0 cal.ka B.P.），湖区环境整体上趋向于干旱化，并伴有两次相对湿润时期（2.6~2.0 cal.ka B.P.和1.4~1.0 cal.ka B.P.）。玛旁雍错环境变化表明，晚冰期以来（14.0~3.4 cal.ka B.P.），受到太阳辐射的影响，印度季风带来的降水以及冰川融水较多，湖区环境较为湿润，整体上有利于内源生物的生存；晚全新世（3.4~0 cal.ka B.P.），北半球夏季太阳辐射量减少，印度季风减弱，径流减弱，湖区环境朝干旱化方向发展。
关键词: 青藏高原/
玛旁雍错/
湖泊沉积/
环境变化/
晚冰期

Abstract:Mapam Yumco, located in the southwest of Tibetan Plateau, is one of the ideal areas to study the evolution of Indian monsoon. A 4.69 m long core was obtained at a depth of 75 m at Mapam Yumco using a piston sampler. The core age was determined by ²¹⁰Pb and AMS ¹⁴C dating. According to the element content(XRF scanning), total organic carbon(TOC), total inorganic carbon(TIC) and total nitrogen(TN) et al, lake environment changes since 14 cal.ka B. P. were reconstructed. The results showed that during the deglaciation period(14~12 cal.ka B. P.), TOC and TIC showed that the lake environment was relatively warm and wet on the whole. 12.0~11.4 cal.ka B. P., runoff was significantly weakened under the influence of the YD event. In the Early and Middle Holocene(11.4~3.4 cal.ka B. P.), the overall environment of the lake area was still warm and humid, and the climate fluctuated. There were two cold events(10.2~9.8 cal.ka B. P. and about 8.2 cal.ka B. P.), and 7.4~6.6 cal.ka B. P., showing a warm period. In the Late Holocene(3.4~0 cal.ka B. P.), the lake environment as a whole tended to be arid, accompanied by two periods of relative humidity(2.6~2.0 cal.ka B. P. and 1.4~1.0 cal.ka B. P.). The changes in the environment of Mapam Yumco show that since the late glacial period(14.0~3.4 cal.ka B. P.), the Indian monsoon brought more precipitation and the glacier melt water had increased under the influence of solar radiation, and the environment in the lake area is relatively humid, which is conducive to the survival of endogenous organisms on the whole. In the Late Holocene(3.4~0 cal.ka B. P.), the solar radiation in the Northern Hemisphere decreased in the summer, the Indian monsoon weakened and lake environment developed towards aridification.
Key words:Tibetan Plateau/
Mapam Yumco/
lake deposition/
environmental change/
late glacial



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