The Periodicity of the Southwest Monsoon Revealed by the Magnetic Susceptibility of the GarzêA Loess-Paleosol Sequence Using EMD Method

• 责任者：Liu Dongyan (Key Laboratory of Sea Floor Resource and Exploration Technique ; Ministry of Education ; Ocean University of China ; Qingdao 266100 ; China) ; Li Weiran
• 刊名：Earth Science
• 出版年：2010
• 卷期：35(4)
• 关键词：黄土 ; loess ; 磁化率 ; magnetic susceptibility ; 季风 ; monsoon ; 更新世 ; Pleistocene ; 全新世 ; Holocene ; 四川 ; Sichuan Province
• 页码：p.533-541
• 图表：9 illus., 37 refs.
• 分类号：1400
• issnNo：ISSN1000-2383
• isbnNo：CN42-1233/P

The magnetic susceptibility of loess as a proxy for the intensity of summer monsoon has been used to investigate the periodicity of paleoclimatic changes of aeolian deposits in China. However, previous studies focused most on the southeast monsoon areas. On the basis of magnetostratigraphic study of the GarzêA section on the southeastern margin of the Qinghai-Tibetan Plateau, the magnetic susceptibility records during the past 1.16 Ma were subject to empirical mode decomposition (EMD) to discuss the periodicity of the southwest monsoon evolution at various time scales.  Therefore, the main forcing of Indian monsoon system may be the solar insolation at low latitude. As for the studies of paleoenvironment evolution of sedimentary records, EMD is superior and has more potentials than the traditional method of spectral analysis.