Western to Central Equatorial Pacific Planktic Foraminiferal Fluxes: Implication for the Relationship Between Their Assemblage and Warm Pool Migration from 1999 to 2002

IF 0.9 4区 地球科学 Q4 PALEONTOLOGY
M. Yamasaki, Ryo Tokumoto, A. Sasaki, C. Shimada, R. Schiebel
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引用次数: 3

Abstract

Time-series sediment trap experiments were carried out in the western to central equatorial Pacific (Sites MT3, MT4, MT5, and MT7) from 1999 to 2002, over the transitional time period from La Niña to El Niño conditions, in order to evaluate temporal variability in planktic foraminiferal fluxes and their assemblages. The foraminiferal test flux follows a trophic gradient from higher fluxes in the Equatorial Upwelling Region (EUR) and lower fluxes in the Western Pacific Warm Pool (WPWP) region. Globigerinoides ruber commonly dominates in all sites through the experimental period. Trilobatus sacculifer, Globigerinita glutinata, and Neogloboquadrina dutertrei occurred especially in the WPWP. In contrast, Globigerina bulloides and Pulleniatina obliquiloculata characterized the fauna in the EUR. A change in hydrologic conditions from La Niña to El Niño was documented along the sites during the sampled time interval. Simultaneous with an eastward advancement of the WPWP, the EUR retreated to the east. Rapid decreases in the fluxes of G. ruber, G. bulloides, and P. obliquiloculata were recognized immediately after the more oligotrophic WPWP conditions prevailed at Sites MT4, MT5, and MT7. Fluxes of the total planktic foraminifer assemblage increased both in the EUR and in the western side of the WPWP under full El Niño conditions during the second half of 2002. Such increases in test fluxes in the western side of the WPWP were mainly attributed to G. ruber and N. dutertrei, suggesting inputs of eutrophic waters from the northern coastal area of Papua New Guinea. Test fluxes under El Niño conditions in the WPWP were at the same level as those in the EUR, giving rise to strongly increased carbonate fluxes in the western equatorial Pacific.
1999 - 2002年赤道太平洋西部至中部浮游有孔虫通量及其组合与暖池迁移关系的启示
1999 - 2002年,在La Niña至El Niño过渡时期,在赤道太平洋西部至中部(MT3、MT4、MT5和MT7站点)进行了时间序列沉积物捕集试验,以评价浮游有孔虫通量及其组合的时间变化。有孔虫试验通量遵循赤道上升流区(EUR)较高通量和西太平洋暖池区(WPWP)较低通量的营养梯度。在整个试验期间,各试验点均以球芽孢杆菌胶属植物为主。三叶虫、粘球虫和新红腹虫主要发生在西南太平洋地区。欧洲地区的区系以大球虫(Globigerina bulloides)和斜球虫(Pulleniatina obliquiloculata)为主。在采样时间间隔内,记录了从La Niña到El Niño的水文条件变化。在WPWP向东推进的同时,欧元也向东回落。在MT4、MT5和MT7站点出现更少营养的WPWP条件后,立即发现橡胶树、球状橡胶树和斜叶橡胶树的通量迅速减少。2002年下半年,在全El Niño条件下,欧洲和西侧的总浮游有孔虫组合通量都有所增加。WPWP西侧试验通量的增加主要归因于G. ruber和N. duterte,表明来自巴布亚新几内亚北部沿海地区的富营养化水域的输入。在El Niño条件下,WPWP的测试通量与EUR的测试通量相同,导致赤道西太平洋碳酸盐通量大幅增加。
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来源期刊
Journal of Foraminiferal Research
Journal of Foraminiferal Research 地学-古生物学
CiteScore
2.10
自引率
9.10%
发文量
32
审稿时长
>12 weeks
期刊介绍: JFR publishes original papers of international interest dealing with the Foraminifera and allied groups of organisms. Review articles are encouraged.
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