South China Sea surface water evolution over the last 12 Myr: A south-north comparison from Ocean Drilling Program Sites 1143 and 1146

doi:10.1029/2003PA000906

	South China Sea surface water evolution over the last 12 Myr: A south-north comparison from Ocean Drilling Program Sites 1143 and 1146
	Li, BH ; Wang, JL ; Huang, BQ ; Li, QY ; Jian, ZM ; Zhao, QH ; Su, X ; Wang, PX
刊名	PALEOCEANOGRAPHY
	2004-02-12
卷号	19 期号:1
关键词	late Cenozoic planktonic foraminifera sea-surface environment South China Sea west Pacific "warm pool" east Asian winter monsoon
ISSN号	0883-8305
DOI	10.1029/2003PA000906
文献子类	Article
英文摘要	[1] Planktonic foraminifera (PF) from Ocean Drilling Program (ODP) Sites 1143 and 1146 in the southern and northern South China Sea (SCS), respectively, were quantitatively analyzed in order to reconstruct the sea-surface environment over the last 12 Myr. The observed decrease in deep-dwelling PF species after similar to 10 Ma at both sites is interpreted to reflect a depression of the upper water thermocline, corresponding to the closure of the Indonesian Seaway around 11 - 9 Ma. This upper water column structure implies the intensification of equatorial Pacific warm currents and the initial formation of the western Pacific "warm pool'' (WPWP) during the early Late Miocene. The consistent pattern of south-north thermocline evolution and the synchronous disappearance of Globoquadrina dehiscens (9.8 Ma) at both Sites 1143 and 1146 together imply that the entire SCS was likely under the influence of the newly developed WPWP at similar to 10 Ma. After similar to 8 Ma, sea-surface temperatures and thermocline variations evolved differently between the southern and northern SCS. The total deep-dwelling PF fauna at Site 1143 decreased gradually in abundance from 6.6 to 2 Ma, indicating a deepening of the thermocline in the southern SCS. In contrast, deep-dwelling PF species increased in abundance from 3.1 to 2 Ma at Site 1146, reflecting a shoaling of the thermocline in the northern SCS. This south-north contrast reflects two major environmental regimes: ( 1) the southern SCS, which has mainly been under the influence of the WPWP since the late Late Miocene, and ( 2) the northern SCS, where effects of the east Asian winter monsoon have prevailed, especially since the Late Pliocene. Estimate of past sea-surface temperatures (SSTs) at Site 1143 suggests a relatively stable and warm environment in the southern SCS since about 2.5 Ma, with an increased influence of warm subsurface waters after the mid-Pleistocene transition (1.2 - 0.9 Ma). In the northern SCS, however, a gradual decrease in winter SST recorded at Site 1146 over the last 4 Myr records east Asian monsoon evolution, especially the enhancement of the east Asian winter monsoon between 3.1 and 2 Ma.
WOS关键词	PACIFIC WARM POOL ; WESTERN PACIFIC ; EQUATORIAL PACIFIC ; PALEOCEANOGRAPHIC CHANGES ; PLANKTONIC-FORAMINIFERA ; THERMAL STRUCTURE ; GLACIAL MAXIMUM ; TEMPERATURE ; RECONSTRUCTIONS ; CIRCULATION
WOS研究方向	Geology ; Oceanography ; Paleontology
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000189055000001
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/79585]
专题	中国科学院地质与地球物理研究所
通讯作者	Li, BH
作者单位	1.Acad Sinica, Inst Geol & Palaeontol, Nanjing 210008, Peoples R China 2.China Univ Geosci, Inst Marine Geol & Geophys, Beijing 100083, Peoples R China 3.Tongji Univ, Lab Marine Geol, Shanghai 200092, Peoples R China 4.Shanghai Sci & Technol Museum, Shanghai, Peoples R China 5.Peking Univ, Dept Geog, Beijing 100871, Peoples R China 6.Univ Adelaide, Sch Earth & Environm Sci, Adelaide, SA, Australia
推荐引用方式 GB/T 7714	Li, BH,Wang, JL,Huang, BQ,et al. South China Sea surface water evolution over the last 12 Myr: A south-north comparison from Ocean Drilling Program Sites 1143 and 1146[J]. PALEOCEANOGRAPHY,2004,19(1).
APA	Li, BH.,Wang, JL.,Huang, BQ.,Li, QY.,Jian, ZM.,...&Wang, PX.(2004).South China Sea surface water evolution over the last 12 Myr: A south-north comparison from Ocean Drilling Program Sites 1143 and 1146.PALEOCEANOGRAPHY,19(1).
MLA	Li, BH,et al."South China Sea surface water evolution over the last 12 Myr: A south-north comparison from Ocean Drilling Program Sites 1143 and 1146".PALEOCEANOGRAPHY 19.1(2004).