Multi-scale analysis of the Asian Monsoon change in the last millennium
TingGui Jiang1,2,3, JiaJia Lin4, ZhenShan Lin1,2,3, and YuXia Li1,2,31College of Geography Science, Nanjing Normal University, Nanjing, China 2Jiangsu Key Laboratory of Environmental Change and Ecological Construction, Nanjing, China 3Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, China 4Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago, IL, USA
Received: 11 Dec 2015 – Accepted for review: 11 Mar 2016 – Discussion started: 23 Mar 2016
Abstract. The change rule and the driving mechanism of the Asian monsoon (AM) is widely concerned. In this paper, we have decomposed the Huangye cave δ18OR datasets (proxy for AM) into variations at different time scales with the Ensemble Empirical Mode Decomposition (EEMD) method, obtained the main cycles of the Asian monsoon changes and drought and wet periods in the last millennial history, analysed and predicted the precipitation trend at the local site in the future. Meantime, we have also decomposed 10Be (proxy for solar activity) and average Northern Hemisphere Temperature (NHT) datasets with the EEMD method. The relationship among the components of δ18OR, 10Be and NHT shows that NHT as well as solar activity has the obvious driving effect on the AM at millennial scales, and NHT with the frequency and amplitude modulations can influence the intensity of the AM more directly and obviously than the solar activity in the last 1000 years.
Jiang, T., Lin, J., Lin, Z., and Li, Y.: Multi-scale analysis of the Asian Monsoon change in the last millennium, Nonlin. Processes Geophys. Discuss., doi:10.5194/npg-2015-75, 2016.