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| Forcing mechanism of the Pleistocene east Asian monsoon variations in a phase perspective | |
| 作者姓名： | TIAN Jun WANG Pinxian CHENG Xinrong WANG Rujian & SUN Xiangjun . State Key Laboratory of Marine Geology Tongji University Shanghai China . Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China . Institute of Botany Chinese Academy of Sciences Beijing China |
| 作者单位： | TIAN Jun1，2，WANG Pinxian1，CHENG Xinrong1，WANG Rujian1 & SUN Xiangjun1，3 1. State Key Laboratory of Marine Geology，Tongji University，Shanghai 200092，China; 2. Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China; 3. Institute of Botany，Chinese Academy of Sciences，Beijing 100093，China |
| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
| 摘 要： | The variations of the Earth’s geometry (ETP) pre-dominate climate changes such as monsoon on the Earth1], serving as its external forcing. The loess/ paleosol sequence in Central China provides a good record of terrestrial deposition to study the evolution of the east Asian monsoon2―4]. However, the deep sea deposition, due to its high resolution dating and abun-dant climate proxies, should be able to provide more climatic information in the geological time, such as the forcing mechanis… |
Forcing mechanism of the Pleistocene east Asian monsoon variations in a phase perspective |
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| TIAN Jun,,WANG Pinxian,CHENG Xinrong,WANG Rujian & SUN Xiangjun, . State Key Laboratory of Marine Geology,Tongji University,Shanghai ,China, . Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing ,China, . Institute of Botany,Chinese Academy of Sciences,Beijing ,China.Forcing mechanism of the Pleistocene east Asian monsoon variations in a phase perspective[J].Science in China(Earth Sciences),2005,48(10). | |
| Authors: | TIAN Jun WANG Pinxian CHENG Xinrong WANG Rujian SUN Xiangjun |
| Institution: | 1. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China 3. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China |
| Abstract: | The deep sea records from the ODP Sites 1143 and 1144 in the northern and southern South China Sea (SCS), including foraminiferal δ18O and δ13C, Opal% and pollen percentage, reveal that the variations of the east Asian monsoon have been closely correlated with the variations of the Earth's orbital parameters (eccentricity, obliquity and precession) and the global ice volume on orbital scale. All the monsoonal proxies show strong 100 ka, 41 ka and 23 ka cycles. Although G. ruber δ13C of Site 1143 is coherent with the ETP (ETP= normalized (eccentricity + obliquity-precession) at eccentricity, obliquity and precession bands, most of the coherent relationship focuses on the precession band, and the other monsoonal proxies are coherent with the ETP only at the precession band, which indicate that precession dominates the Pleistocene tropical climate changes. The phase relationship of the monsoonal proxies with the foraminiferal δ18O implies that the global ice volume changes have played a significant role in modulating the east Asian monsoon climate, at least dominating the winter monsoon. This forcing mechanism of the east Asian monsoon is apparently different from that of the Indian ocean monsoon. The variations of the east Asian monsoon at the precession band, at least that of the winter monsoon, have been controlled not only by the sensible heating but also by the latent heating of the surface water in the South China Sea. |
| Keywords: | South China Sea ODP east Asian monsoon orbital forcing global ice volume |
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