img

Wechat

Adv search

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (2): 109-117.DOI: 10.7522/j.issn.1000-694X.2020.00004

Previous Articles     Next Articles

Holocene climatic instability record in the southeastern margin of Mu Us Desert

Li Xiang1, Su Zhizhu2, Ma Yijuan3, Zhang Caixia4, Liu Miaomiao1   

  1. 1. College of Environment and Resources, Shanxi University, Taiyuan 030006, China;
    2. Historical Culture School, Shanxi University, Taiyuan 030006, China;
    3. College of Geography Science, Taiyuan Normal University, Jinzhong 030619, Shanxi, China;
    4. Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2019-12-11 Revised:2020-01-06 Online:2020-03-20 Published:2020-04-26

Abstract: Since Holocene, the temperature has risen and the climate is generally stable, but there are still climate fluctuations. Located in the northwestern edge of the East Asian monsoon, Mu Us Desert stratigraphic sedimentary sequence reveals the climatic instability on the millennium and centennial scales in Holocene. The result shows: (1)The grain and Rb/Sr ratio of DLT and NB section in the desert/loess boundary zone can be used as climate and environment index. The increase of >63 μm sand content and the decrease of Rb/Sr ratio revealed the east Asian winter monsoon enhanced, aeolian sand accumulated, aeolian sand activity intensified and the climate was cold and dry. Controversially, the east Asian summer monsoon strengthened, precipitation increased, pedogenesis strengthened, and the climate was warm and humid. (2)The analysis of the age probability density of the desert/loess boundary zone and low-lying valley in the southeast margin of the Mu Us Desert indicated that the aeolian sand accumulated at -8.5 ka BP in the early Holocene, aeolian sand activity intensified and the climate was cold and dry. In the middle of Holocene, the paleosol strata were widely developed between 8.5 ka and 3.0 ka BP in the highland, and the lacustrine/peat layers were generally deposited in the low-lying areas. While there were sedimentary interruption near 6.0 ka BP and the climate turned cold. After 3.0 ka BP, climate fluctuated frequently in the late Holocene. (3)The climate change in Mu Us Desert is consistent with the records of ice-raft cold events in the North Atlantic, Dongge Cave stalagmite, lakes and eastern sandy land in the monsoon marginal areas in China. The millennium/centennial scale climate change in Mu Us Desert during Holocene is influenced by the global and regional climate change, which is significance for predicting climate change.

Key words: climate change, chronological data, probability density, Holocene, the Mu Us Desert, chronological data, Holocene, probability density, the Mu Us Desert

CLC Number: