Apparent discrepancy of Tibetan ice core δ18O records may be attributed to misinterpretation of chronology

• Published in: The Cryosphere
• Main Authors: Hou, Shugui, Zhang, Wangbin, Pang, Hongxi, Wu, Shuang-Ye, Jenk, Theo M., Schwikowski, Margit, Wang, Yetang
• Format: Text
• Language: English
• Published: 2019
• Subjects: Ice cap; ice core
• Online Access: https://doi.org/10.5194/tc-13-1743-2019; https://tc.copernicus.org/articles/13/1743/2019/

Ice cores from the Tibetan Plateau (TP) are widely used for reconstructing past climatic and environmental conditions that extend beyond the instrumental period. However, challenges in dating and interpreting ice core records often lead to inconsistent results. The Guliya ice core drilled from the northwestern TP suggested a cooling trend during the mid-Holocene based on its decreasing δ 18 O values, which is not observed in other Tibetan ice cores. Here we present a new high-resolution δ 18 O record of the Chongce ice cores drilled to bedrock ∼30 km away from the Guliya ice cap. Our record shows a warming trend during the mid-Holocene. Based on our results as well as previously published ice core data, we suggest that the apparent discrepancy between the Holocene δ 18 O records of the Guliya and the Chongce ice cores may be attributed to a possible misinterpretation of the Guliya ice core chronology.