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
Kamikuri, S; Motoyama, I; Nishi, H; Iwai, M; kamikuri@geol.tsukuba.ac.jp
2009
发表期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
卷号280期号:40606页码:469-479
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.
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
关键词Radiolarian Assemblages Eastern Equatorial Pacific Eastern Pacific Warm Pool Northern Equatorial Countercurrent Indonesian And Central American Seaways
学科领域Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
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收录类别sci
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/8409
专题海洋科技动态信息-印太暖池系统研究
通讯作者kamikuri@geol.tsukuba.ac.jp
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Kamikuri, S,Motoyama, I,Nishi, H,et al. 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[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2009,280(40606):469-479.
APA Kamikuri, S,Motoyama, I,Nishi, H,Iwai, M,&kamikuri@geol.tsukuba.ac.jp.(2009).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,280(40606),469-479.
MLA Kamikuri, S,et al."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 280.40606(2009):469-479.
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