Preprints
https://doi.org/10.5194/tc-2022-43
https://doi.org/10.5194/tc-2022-43
 
22 Mar 2022
22 Mar 2022
Status: this discussion paper is a preprint. It has been under review for the journal The Cryosphere (TC). The manuscript was not accepted for further review after discussion.

Late Holocene glacier variations in the central Tibetan Plateau indicated by the δ18O of ice core enclosed gaseous oxygen

Jiule Li1,2, Baiqing Xu1,2,3, Ninglian Wang3,4, Ping Yao1, and Xiangke Xu1,2,3 Jiule Li et al.
  • 1Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
  • 2Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Chinese Academy of Sciences, Beijing 100101, China
  • 3CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China
  • 4College of Urban and Environmental Sciences, Northwest University, Xi’an, 710069, China

Abstract. The δ18O of gaseous oxygen in ice core air bubbles (δ18Obub) has been widely used for reconstruction of climate changes in polar glaciers. Yet, less is known about its climatic implication in alpine glaciers as the lack of continuous record. Here, we present a long-term δ18Obub record from the Tanggula glacier in the central Tibetan Plateau (TP). It shows that there is a good correlation between the variation of the δ18Obub in this alpine ice core and the accumulation or melting of the glacier. The more developed the firn layer on glacier surface, the more positive the δ18Obub is. The more intense the glacier melting, the more negative the δ18Obub is. Combined with the chronology of the ice core air bubbles, we reconstructed the glacier variations since the late Holocene in the central TP. It showed that there were four accumulation and three deficit periods of glaciers in this region. The strongest glacier accumulation period was from 1610–300 B.C., which corresponding to the Neoglaciation. The most significant melting period was the last 100 years, which corresponding to the recent global warming. During the Little Ice Age, glacier accumulation in the central TP was not significant, and even short deficit events occurred. Comparisons of the late Holocene glacier variation in the central TP with hemispheric glacier and climate variations showed that it was closely related to the North Atlantic Oscillation.

Jiule Li et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2022-43', Anonymous Referee #1, 22 Mar 2022
    • AC1: 'Reply on RC1', J.-L. Li, 24 Mar 2022
  • RC2: 'Comment on tc-2022-43', Anonymous Referee #2, 07 Apr 2022
  • RC3: 'Comment on tc-2022-43', Anonymous Referee #3, 10 Apr 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2022-43', Anonymous Referee #1, 22 Mar 2022
    • AC1: 'Reply on RC1', J.-L. Li, 24 Mar 2022
  • RC2: 'Comment on tc-2022-43', Anonymous Referee #2, 07 Apr 2022
  • RC3: 'Comment on tc-2022-43', Anonymous Referee #3, 10 Apr 2022

Jiule Li et al.

Jiule Li et al.

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Short summary
The air bubbles enclosed in the alpine glacier ice could be used to reveal regional climate changes. Thus, we analyzed the δ18O of gaseous oxygen in the ice core air bubbles (δ18Obub) from a glacier in the Tibetan Plateau (TP). We find that there is a good correlation between the variation of the δ18Obub and the accumulation or melting of the glacier. Combined with the chronology of the ice core air bubbles, we reconstruct the glacier variations since the late Holocene in the central TP.