Forcing mechanism of the Pleistocene east Asian monsoon variations in a phase perspective

Author(s): Tian Jun; Wang Pinxian; Cheng Xinrong; Wang Rujian; Sun Xiangjun
Author Affiliation(s): Primary:
Tongji University, State Key Laboratory of Marine Geology, Shanghai, China
Other:
Chinese Academy of Sciences, China
Volume Title: Science in China. Series D, Earth Sciences
Source: Science in China. Series D, Earth Sciences, 48(10), p.1708-1717. Publisher: Science in China Press, Beijing, China. ISSN: 1006-9313
Note: In English. 24 refs.; illus., incl. 1 table
Summary: Deep-sea records from ODP Sites 1143 and 1144 in the northern and southern South China Sea (SCS), including foraminiferal δ18O and δ13C, opal percentage and pollen percentage, reveal that variations in the east Asian monsoon are closely correlated with variations in the Earth's orbital parameters (eccentricity, obliquity and precession) and global ice volume on an orbital scale. All the monsoonal proxies show strong 100 ka, 41 ka and 23 ka cycles. Although G. ruber δ13C from 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. The other monsoonal proxies are coherent with the ETP only at the precession band, which indicates that precession dominates the Pleistocene tropical climate changes. The phase relationship of the monsoonal proxies with foraminiferal δ18O implies that 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. Variations in the east Asian monsoon at the precession band, at least that of the winter monsoon, have been controlled not only by sensible heating but also by latent heating of surface water in the South China Sea.
Year of Publication: 2005
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; C-13/C-12; Carbon; Cenozoic; Climate forcing; Foraminifera; Global ice volume; Ice; Invertebrata; Isotope ratios; Isotopes; Leg 184; Marine sediments; Microfossils; Miospores; Monsoons; North Pacific; Northwest Pacific; O-18/O-16; ODP Site 1143; ODP Site 1144; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleoclimatology; Palynomorphs; Pleistocene; Pollen; Protista; Quaternary; Sediments; South China Sea; Stable isotopes; Variations; West Pacific; Wind transport
Coordinates: N092143 N092143 E1131707 E1131707
Record ID: 2009023262
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