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学科主题: Geography, Physical; Geosciences, Multidisciplinary; Paleontology
题名: Evolution of Eastern Pacific Warm Pool and upwelling processes since the middle Miocene based on analysis of radiolarian assemblages: Response to Indonesian and Central American Seaways
作者: Kamikuri, S ; Motoyama, I ; Nishi, H ; Iwai, M
通讯作者: kamikuri@geol.tsukuba.ac.jp
关键词: Radiolarian assemblages ; Eastern equatorial Pacific ; Eastern Pacific Warm Pool ; Northern Equatorial Countercurrent ; Indonesian and Central American Seaways
刊名: PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
发表日期: 2009-01-01
卷: 280, 期:40606, 页:469-479
收录类别: sci
部门归属: [Kamikuri, Shin-ichi; Motoyama, Isao] Univ Tsukuba, Dept Earth Evolut Sci, Tsukuba, Ibaraki 3058572, Japan; [Nishi, Hiroshi] Hokkaido Univ, Grad Sch Sci, Sapporo, Hokkaido 0600810, Japan; [Iwai, Masao] Kochi Univ, Dept Nat Sci, Kochi 7808520, Japan
摘要: A quantitative racholarian study at Ocean Drilling Program Site 1241 in the eastern tropical Pacific enables us to reconstruct paleoceanographic changes that occurred since the latest middle Miocene. Today. this site is located just under the Eastern Pacific Warm Pool (EPWP). Based on the abundance variations of radiolarian characteristic species which are indicators of upwelling and thermocline changes, it is suggested that three notable changes occurred at 10.6,9.8, and 4.2 Ma in the region. Four distinct periods of oceanographic conditions bounded by these notable changes were characterized on the basis of the following: (1) stratified seawater (12.0 to 10.6 Ma): (2) a shallowing of the thermocline and an increasing of upwelling (10.6 to 9.8 Ma); (3) significant inflow of warm water to the eastern tropical Pacific caused by an intensified Northern Equatorial Countercurrent (NECC), resulting in the formation of EPWP (9.8 to 4.2 Ma); and (4) the reduction of the EPWP and the NECC, and an increase in upwelling (4.2 to 0 Ma). The timing of these paleoceanographic events indicated the strong relations with the opening and closing of the Indonesian and Central American (Panama) Seaways. The reduction of the EPWP (this study) and the deepening of the thermocline in western Pacific at about 4.2 Ma (Cannariato and Ravelo, 1997; Chaisson and Ravelo, 2000) indicated a change from a state resembling El Nino in the late Miocene and the early Pliocene time to a state resembling La Nina by the late Pliocene. (c) 2009 Elsevier B.V. All rights reserved.
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/8409
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Recommended Citation:
Kamikuri, S; Motoyama, I; Nishi, H; Iwai, M.Evolution of Eastern Pacific Warm Pool and upwelling processes since the middle Miocene based on analysis of radiolarian assemblages: Response to Indonesian and Central American Seaways,PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2009,280(40606):469-479
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文件名: Evolution of Eastern Pacific Warm Pool and upwelling processes since the middle Miocene based on analysis of radiolarian assemblages Response to Indonesian and Central American Seaways.pdf
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