DOI: 10.1016/j.palaeo.2013.12.036
论文题名: Paleoceanographic history of the Northwest Pacific Ocean over the past 740kyr, discerned from radiolarian fauna
作者: Matsuzaki K.M. ; Nishi H. ; Suzuki N. ; Cortese G. ; Eynaud F. ; Takashima R. ; Kawate Y. ; Sakai T.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 396 起始页码: 26
结束页码: 40
语种: 英语
英文关键词: Mid-Brunhes Event
; Oyashio Current
; Radiolaria
; SST
; Tsugaru Current
英文摘要: The Northwest Pacific Ocean is characterized by a strong mixing of water masses, due to the interplay of three distinct currents, i.e., the Kuroshio, the Tsugaru, and the Oyashio. The C9001C drill core site, located east of the Shimokita Peninsula and directly influenced by the Tsugaru warm current and the Oyashio subarctic current was used here to reconstruct the paleoceanographical history of this region, especially focusing on the Mid-Brunhes Event (MBE) and its consequences. This core provides a continuous record from marine isotope stage (MIS) 18 (740. ka) to the present. Polycystine radiolarian assemblages were analyzed to highlight paleoceanographic and sea surface temperature changes at this site. Based on the radiolarian fauna, seven time periods are defined, which coincide with changes in the dynamics of the Tsugaru and Oyashio currents, respectively. The oldest time interval covered by our analysis (i.e., VII: 740-621. ka) was marked by generally sluggish ocean circulation. The Tsugaru Current influence increased during the following Interval VI (621-478. ka) which encompasses interglacials MIS 15 and 13, while the Oyashio Current strengthened during the Interval V (478-337), i.e. from glacials MIS 12 to 10. These latter intervals (VI to V) constitute a long climatic transitional period where Tsugaru Current and Oyashio Current influences are strengthened. In the time period from Interval IV to Interval I (0-337. ka), the warming intensity of interglacials (MIS 9, MIS 5) appears to be close to the modern one. However, several unusually warm glacials, associated with a relatively strong Tsugaru Current flow, were identified during this interval (e.g., MIS 8 and MIS 6). Radiolarian productivity data suggest that during Intervals VII to V, deep water masses are rich in nutrient content. However, a high vertical mixing event is recorded after Interval IV, when high nutrient concentrations appear to shift to the surface layer. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69456
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Geology and Paleontology, Graduate School of Science, Tohoku University, Aramaki Aza Aoba 6-3, Sendai 980-8578, Japan; The Center for Academic Resources and Archives, Tohoku University Museum, Tohoku University, Aramaki Aza Aoba 6-3, Sendai 980-8578, Japan; Department of Paleontology, GNS Science, 1 Fairway Drive, Lower Hutt 5040, New Zealand; UMR 5805 EPOC, OASU, Site de Talence, Université Bordeaux 1, Avenue des Facultes, Talence Cedex, France; Department of Geology, Faculty of Agriculture Utsunomiya, Utsunomiya, Tochigi 321-8505, Japan
Recommended Citation:
Matsuzaki K.M.,Nishi H.,Suzuki N.,et al. Paleoceanographic history of the Northwest Pacific Ocean over the past 740kyr, discerned from radiolarian fauna[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,396