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Variations in the western Pacific warm pool across the mid-Pleistocene: Evidence from oxygen isotopes and coccoliths in the West Philippine Sea
Sun, Hanjie1,3; Li, Tiegang2,3,7; Liu, Chuanlian4; Chang, Fengming1,3; Sun, Rongtao5; Xiong, Zhifang1,3; An, Baizheng3,6
2017-10-01
发表期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷号483页码:157-171
文章类型Article
摘要We present planktonic foraminifera oxygen isotope and Florisphaera profunda abundance data from the International Marine Global Change Study Program (IMAGES) Core MD06-3050, which was collected in the West Philippine Sea on the margin of the Western Pacific Warm Pool (WPWP). Our records reveal marked changes in the upper water structure in the Kuroshio source region as early as 1.5 Ma, continuing through the mid-Pleistocene climate transition (MPT). These changes are evidenced by reconstructions of the thermocline (based on planktonic foraminiferal oxygen isotope differences) and the nutricline (based on the relative abundance of the coccolithophore species Florisphaera profunda) in the Kuroshio source region. The evolution of the thermocline/nutricline featured three prominent phases: 1) phase I (1.5-1.1 Ma), which was characterized by low-amplitude variations in a shallow thermocline; 2) phase II (1.1-0.8 Ma), which was characterized by high-amplitude variations in a relatively shallow thermocline/nutricline; and 3) phase III (0.8-0.5 Ma), which was characterized by low-amplitude variations in a deep thermocline/nutricline. Combined with the zonal sea surface temperature gradient in the tropical Pacific, the evolution of the upper water structure can be linked to tropical climatic changes across the MPT, including the intensification of atmospheric circulation and a gradual cessation of the long-term El Nino-like state. The upper water structure of the WPWP was asymmetric before 0.8 Ma, with a shallow thermocline/nutricline along the northern margin and a deep thermocline/nutricline in the center of the WPWP and South China Sea (SCS). The modern WPWP was established by approximately 0.8 Ma, and the upper water structure has changed synchronously as a whole since that time. A comparison of the delta O-18 values derived from Globigerinoides ruber tests from the MD06-3050 core with those from other cores in the western Pacific suggests that the lower glacial/interglacial G. ruber delta O-18 values in MD06-3050 before 0.8 Ma could be related to the enhancement of the WPWP and to changes in atmospheric circulation patterns. (C) 2017 Published by Elsevier B.V.
关键词West Philippine Sea Upper Water Structure Florisphaera Profunda Planktonic Foraminiferal Oxygen Isotope Wpwp
DOI10.1016/j.palaeo.2017.07.008
收录类别SCI
语种英语
WOS记录号WOS:000411547300013
引用统计
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/143219
专题海洋地质与环境重点实验室
作者单位1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.SOA, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, Qingdao 266061, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266000, Peoples R China
4.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
5.Shandong Univ Technol, Sch Resources & Environm Engn, Zibo 255049, Peoples R China
6.Qingdao Inst Marine Geol, Qingdao 266071, Peoples R China
7.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Sun, Hanjie,Li, Tiegang,Liu, Chuanlian,et al. Variations in the western Pacific warm pool across the mid-Pleistocene: Evidence from oxygen isotopes and coccoliths in the West Philippine Sea[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2017,483:157-171.
APA Sun, Hanjie.,Li, Tiegang.,Liu, Chuanlian.,Chang, Fengming.,Sun, Rongtao.,...&An, Baizheng.(2017).Variations in the western Pacific warm pool across the mid-Pleistocene: Evidence from oxygen isotopes and coccoliths in the West Philippine Sea.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,483,157-171.
MLA Sun, Hanjie,et al."Variations in the western Pacific warm pool across the mid-Pleistocene: Evidence from oxygen isotopes and coccoliths in the West Philippine Sea".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 483(2017):157-171.
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