琉球海溝斜面から得られたピストン・コアの解析に基づく,過去6万年間にわたる海洋表層の生物生産性の変化

• 岡 俊太郎

  北海道大学大学院地球環境科学研究科

書誌事項

タイトル別名

• Primary Production Changes for the Past 60,000 Years: Deduced by the Analyses on a Piston Core from the Ryukyu Trench Slope, Northwest Pacific Ocean.
• Deduced by the Analyses on a Piston Core from the Ryukyu Trench Slope, Northwest Pacific Ocean

抄録

A piston core (RN95-PC4) collected from the central Ryukyu Trench slope is investigated concerning the down-core fluctuations in planktic and benthic δ¹⁸O and δ¹³C values, total organic carbon contents (TOC), organic carbon/nitrogen (C/N) ratios, calcium carbonate contents, benthic foraminiferal crops, and planktic foraminiferal fauna. Based upon the oxygen isotope stratigraphy and three AMS¹⁴C dates, this core reveals a continued sedimentation for the past -60ka; from the early oxygen isotope Stage 3 to the present. The primary production in surface water increased during the last glacial period, particularly in Stage 2, judging from the significant signals in down-core changes of benthic δ¹³C values, TOC, C/N ratios, and so on. Analysis of planktic foraminiferal fauna suggests that the increased primary production in Stage 2 might be ascribed to relative development of upwelling with cold water invasion.

収録刊行物

• 第四紀研究

  第四紀研究 37 (5), 361-370, 1998

  日本第四紀学会

キーワード

• Ryukyu Trench slope
• primary production
• oxygen isotope ratio
• carbon isotope ratio
• total organic carbon contents

詳細情報

• CRID: 1390282681473560576
• NII論文ID: 10002510699
• NII書誌ID: AN0034136X
• DOI: 10.4116/jaqua.37.361
• ISSN: 18818129
• ISSN: 04182642
• NDL書誌ID: 105858
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I105858
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可