WEKO3
Item
Early to Middle Pleistocene paleoceanographic history of the southern Japan based on radiolarian data from IODP Exp. 314/315 Sites C0001 and C0002
https://aist.repo.nii.ac.jp/records/2001999
https://aist.repo.nii.ac.jp/records/20019997e69ba87-50c6-4194-bee0-b9db99c0728d
| Item type | Research Data (v9)(1) | |||||||||||||||
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| PubDate | 2015-01-01 | |||||||||||||||
| Data name | ||||||||||||||||
| Title | Early to Middle Pleistocene paleoceanographic history of the southern Japan based on radiolarian data from IODP Exp. 314/315 Sites C0001 and C0002 | |||||||||||||||
| Language | en | |||||||||||||||
| Description of data | ||||||||||||||||
| Description Type | Abstract | |||||||||||||||
| Description | The impact of the MPT on the Kuroshio Current off southern Japan remains unknown, however, in the absence of a long core covering the period of the MPT. In this area, preservation of calcareous microfossils is poor, but polycystine radiolarians are abundant and well preserved. Therefore, they are an excellent alternative proxy for reconstructing past climate change. Indeed, because numerous studies have examined the geographic distribution of modern radiolarian species, the relationships between several radiolarian assemblage groups (e.g., equatorial to sub-arctic assemblage groups) and climatic conditions are well understood. We examined the impact of the MPT on the Kuroshio Current off the Kii Peninsula, southern Japan, by investigating radiolarian assemblages in deep-sea cores collected during Integrated Ocean Drilling Program Expedition 314/315. We studied the radiolarian assemblages in 293 samples from cores recovered at Site C0001 Holes E and F and Site C0002 Hole D. The age models for these cores, which are based on biostratigraphy and chemostratigraphy, showed that sediments from the period between Marine Isotope Stage (MIS) 15 and MIS 8, which includes the Mid-Brunhes Event, are missing from these cores. However, continuous data are available between MIS 63 (1.82 Ma) and MIS 15 (0.5 Ma). Therefore, by using the ecological properties of 10 key radiolarian species, we reconstructed regional paleoceanographic changes between 1.82 and 0.5 Ma. We found that the relative abundance of Kuroshio gyre taxa (e.g., Didymocyrtis tetrathalamus and the Polysolenia spinosa/lappacea group) increased drastically during the MPT, possibly indicating a northward shift of the Kuroshio at that time. The relative abundance of Rhizosphaera mediana, an Oyashio/Kuroshio mixed-water species, also increased during this interval. Thus, a southward shift of the Oyashio Current may have occurred synchronously with a northward shift of the Kuroshio during the MPT. | |||||||||||||||
| Language | en | |||||||||||||||
| Author (Creator) name |
Marc Raymond
× Marc Raymond
× 鈴木 紀毅
× 西 弘嗣
× 林 広樹
× Babu R. Gyawali
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| Access Rights | ||||||||||||||||
| Access Rights | open access | |||||||||||||||
| Access Rights URI | http://purl.org/coar/access_right/c_abf2 | |||||||||||||||
| APC | ||||||||||||||||
| APC | Not required | |||||||||||||||
| Rights Holder | ||||||||||||||||
| Right Holder Name | Marc Raymond | |||||||||||||||
| Language | en | |||||||||||||||
| Publisher | ||||||||||||||||
| Publisher | ELSEVIER SCIENCE BV | |||||||||||||||
| Language | en | |||||||||||||||
| Date | ||||||||||||||||
| Date | 2015-01-01 | |||||||||||||||
| Date Type | Issued | |||||||||||||||
| Language | ||||||||||||||||
| Language | eng | |||||||||||||||
| Resource Type | ||||||||||||||||
| Resource Type Identifier | http://purl.org/coar/resource_type/c_6501 | |||||||||||||||
| Resource Type | journal article | |||||||||||||||
| Identifier | ||||||||||||||||
| Identifier | 10.1016/j.marmicro.2015.05.001 | |||||||||||||||
| Identifier Type | DOI | |||||||||||||||
| Relation | ||||||||||||||||
| Relation Type | isVersionOf | |||||||||||||||
| Identifier Type | URI | |||||||||||||||
| Related Identifier | http://www.sciencedirect.com/science/article/pii/S0377839815000365 | |||||||||||||||
| Language | ja | |||||||||||||||
| Related Title | 関連 URI | |||||||||||||||
| Source Title | ||||||||||||||||
| Source Title | MARINE MICROPALEONTOLOGY | |||||||||||||||
| Language | en | |||||||||||||||
| Volume Number | ||||||||||||||||
| Volume | 118 | |||||||||||||||
| Page Start | ||||||||||||||||
| Start Page | 17 | |||||||||||||||
| Page End | ||||||||||||||||
| End Page | 33 | |||||||||||||||
