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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24710

Title: A late Quaternary planktonic foraminifer faunal record of rapid climatic changes from the South China Sea
Authors: Min-Te Chen;Chung-Ho Wang;Chi-Yue Huang;Pinxian Wang;Luejiang Wang;Michael Sarnthein
Contributors: NTOU:Institute of Applied Geosciences
Keywords: paleoceanography;paleoclimatology;Pacific Ocean;Quaternary
Date: 1999-03-15
Issue Date: 2011-10-20T08:17:27Z
Publisher: Marine Geology
Abstract: abstract:A high-resolution planktonic foraminifer record from a core recovered from the South China Sea (SCS) (Sonne 17938-2: 19°47.2′N, 117°32.3E; 2840 m; Δt ≈250–1000 years) shows rapid millennial-scale changes in the western Pacific marginal sea climate during the last 30,000 years. The SCS is the largest western Pacific marginal sea off the southeast Asian continent, the area today dominated by seasonal monsoon changes. Quantitative analyses of planktonic foraminifer faunal abundance data from the core indicate large downcore variations in the relative abundances of the dominant taxa since about 30,000 years ago in the isotope stage 3. Further analyses indicate that the abundance of G. inflata, a good indicator species for cold SST (∼13°–19°C) and deep MLD (∼100–125 m) waters shows abrupt shifts. During stages 2 and 3, the abundance record of G. inflata tends to be punctuated by quasi-periodic short intervals (∼2000–3000 yrs) where its abundance reaches 15% or greater, superimposed on generally low (5–10%) background values. This pattern suggests an instability of surface ocean conditions of the SCS during the past 30,000 years. The abrupt abundance changes of G. inflata correlate well with similar climatic changes observed from a GISP2 ice core δ18O, and North Atlantic core DSDP 609 N. pachyderma (s.) and lithic grain abundances during `Heinrich events'. These results suggest that the millennial-scale variability of climate is not peculiar to the Atlantic region. Apparently, the rapid SCS climatic changes during Heinrich events are driven by effective mechanisms, of particularly the effects of shifts in the latitudinal position of the Siberia High Pressure System.
Relation: 156(1-4), pp.85–108
URI: http://ntour.ntou.edu.tw/handle/987654321/24710
Appears in Collections:[應用地球科學研究所] 期刊論文

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