前期～中期中新世の熱帯・赤道循環系の形成とインドネシア海峡の閉塞との相互関係

Material type: 文書・図像類

Author: 上栗, 伸一ほか

Publisher: 茨城大学教育学部

Publication date: 2018-06-14

Material Format: Digital

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Material Type: 文書・図像類
Title: 前期～中期中新世の熱帯・赤道循環系の形成とインドネシア海峡の閉塞との相互関係
Author/Editor: 上栗, 伸一
Kamikuri, Shin-ichi
Author Heading: 上栗, 伸一
Kamikuri, Shin-ichi
Publication, Distribution, etc.: 茨城大学教育学部
Publication Date: 2018-06-14
Publication Date (W3CDTF): 2018-06-14
Alternative Title: Reconstruction of oceanic circulation patterns in the tropical Pacific across the early/middle Miocene boundary
Text Language Code: jpn
Target Audience: 一般
Note (General): application/pdf
text/plain
研究報告書
研究成果の概要（和文）：本研究では,統合国際深海掘削計画(IODP)によって赤道太平洋で掘削された過去800万年間にわたる堆積物を使用し,前期中新世から中期中新世の放散虫化石群集に基づいて，海洋表層環境の復元を行った.その結果，前期中新世末(16.7Ma)以降,赤道太平洋におけるサーモクラインの東西勾配が発達したことが明らかになった.この時期にインドネシア海峡が部分的閉塞したことが原因である可能性がある.前期中新世末から中期中新世初期にかけてMCOと呼ばれる汎世界的な温暖化が起こったことが知られているが,東赤道太平洋ではサーモクラインの浅海化により顕著な温暖化は起こらなかった. 研究成果の概要（英文）：In this study, we reconstruct the changes in tropical oceanic circulation patterns in the Pacific across the early/middle Miocene boundary based on radiolarian assemblages obtained at Integrated Ocean Drilling Program Site U1335 in the eastern tropical Pacific. Beginning in the latest early Miocene (~17 Ma) radiolarian assemblages were dominated by different taxa in the eastern and western tropical Pacific. This pattern is interpreted as indicating a shallower thermocline in the east and a deeper thermocline in the west, based on the relative abundance of the upwelling taxa. There is an overall increasing trend in this difference since the latest early Miocene. We tie these events to the effective closure of the Indo-Pacific seaway and the development of a substantial western Pacific warm pool along with the development of a strong Equatorial Undercurrent.
Access Restrictions: 限定公開
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 茨城大学 : 茨城大学学術情報リポジトリ