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
文献类型：期刊论文
| 作者 | Kamikuri, S ; Motoyama, I ; Nishi, H ; Iwai, M |
| 刊名 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
 |
| 出版日期 | 2009 |
| 卷号 | 280期号:40606页码:469-479 |
| 关键词 | Radiolarian assemblages Eastern equatorial Pacific Eastern Pacific Warm Pool Northern Equatorial Countercurrent Indonesian and Central American Seaways |
| ISSN号 | 0031-0182 |
| 通讯作者 | kamikuri@geol.tsukuba.ac.jp |
| 中文摘要 | 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. |
| 学科主题 | Geography, Physical; Geosciences, Multidisciplinary; Paleontology |
| 收录类别 | SCI |
| 原文出处 | ELSEVIER SCIENCE BV |
| 公开日期 | 2011-07-14 |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/8409]  |
| 专题 | 南海海洋研究所_海洋科技动态信息-印太暖池系统研究 |
| 推荐引用方式 GB/T 7714 | 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.(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. |
入库方式： OAI收割
来源：南海海洋研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。