Late Holocene Indian summer monsoon variations recorded at Lake Erhai, Southwestern China

Xu, H. et al. (2015) Late Holocene Indian summer monsoon variations recorded at Lake Erhai, Southwestern China. Quaternary Research, 83(2), pp. 307-314. (doi: 10.1016/j.yqres.2014.12.004)

Abstract

In this study we report changes in Indian summer monsoon (ISM) intensity during the past ~ 3500 yr inferred from proxy indices at Lake Erhai, southwestern China. Both the pollen concentrations and other proxy indices, including sediment grain size, total organic carbon contents (TOC), and elemental contents (e.g., Fe, Al), clearly indicate a long term decreasing trend in ISM intensity over the late Holocene. During the period from approximately AD 750 to AD 1200, pollen concentrations of conifer and broadleaf trees, and herbs reached the lowest levels over the past ~ 3500 yr; while the pollen percentages of both herbs and broadleaf trees increased, suggesting a significant medieval drought. The grain size, TOC, and elemental contents also support an arid climate during the medieval period. The Little Ice Age (LIA) at Lake Erhai was characterized as cold and wet. The medieval and LIA climatic patterns at Lake Erhai were similar to those over most of the ISM areas, but anti-phase with those over East Asian summer monsoon (EASM) areas. We suspect that sea surface temperature variations in the Indo-Pacific oceans and the related land-sea thermal contrasts may be responsible for such hydroclimatic differences between EASM and ISM areas.

• Item Type: Articles
• Additional Information: This work was funded by the Natural Science Foundation of China (Nos.: 41173122; 41473120) and the National Basic Research Program of China (Nos.: 2013CB955903; 2010CB833405).
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Xu, Dr Sheng
• Authors: Xu, H., Zhou, X., Lan, J., Liu, B., Sheng, E., Yu, K., Cheng, P., Wu, F., Hong, B., Yeager, K. M., and Xu, S.
• College/School: College of Science and Engineering > Scottish Universities Environmental Research Centre
• Journal Name: Quaternary Research
• Publisher: Elsevier
• ISSN: 0033-5894
• Published Online: 14 January 2015