Did change of deep water source amplify or diminish the climate fluctuation?: oceanic event stratigraphy of sulfur isotopes

深水源的变化是放大还是减弱了气候波动？：硫同位素的海洋事件地层学

• 批准号: 20340144
• 负责人: HASEGAWA Takashi
• 金额: $ 11.56万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20340144/
• 关键词: 古環境; 海洋深層水; 白亜紀; 炭素同位体比; 硫黄; 硫黄同位体比; 海洋循環; 海洋無酸素事変; 安定同位体比; 炭酸カルシウム; 層序

Initial purpose of this project is to capture a rapid switch of oceanic deep water sources and to understand how the climate responds to it. After introduction of a mass spectrometer, preparation and analytical techniques for sulfur isotope analysis of carbonate associated sulfate were developed. However, we found that sulfur isotope data do not provide good data for the discussion of our purpose. We abandoned sulfur isotope method and switched our methods to that based on high resolution carbon isotope stratigraphy and theoretical analyses. Then we could estimated time scale of deep water circulation during mid-Cretaceous. A model for evaluating sensitivity of the oceanic environment against CO2 increase in the atmosphere was constructed.

该项目的最初目的是捕捉海洋深层水源的快速转换，并了解气候对其的响应。在引入质谱仪后，开发了碳酸盐相关硫酸盐硫同位素分析的制备和分析技术。然而，我们发现硫同位素数据并没有为我们的目的的讨论提供很好的数据。我们放弃了硫同位素方法，转而采用基于高分辨率碳同位素地层学和理论分析的方法。从而估算出白垩纪中期深水环流的时间尺度。建立了海洋环境对大气CO2浓度增加敏感性评价模型。

项目成果

白亜系層序と国際対比

白垩纪地层学及国际比较

• 发表时间: 2011
• 作者: T. Tsunogae;S.J. Liu;M. Santosh;H. Shimizu;J.H. Li;長谷川卓
• 通讯作者: 長谷川卓

南半球高緯度地域から得られた上部白亜系の有機炭素同位体比変動

南半球高纬度地区上白垩统有机碳同位素比值变化

• 发表时间: 2011
• 作者: 沖野遼,長谷川卓;James Crampton
• 通讯作者: James Crampton

Conditions required for oceanic anoxia/euxinia : Constraints from one-dimensional ocean biogeochemical cycle model

海洋缺氧/真氧所需的条件：一维海洋生物地球化学循环模型的约束

• 发表时间: 2011
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Ozaki;K.;Tajima;S. and Tajika;E
• 通讯作者: E

An indicator of paleosalinity : sedimentary sulfur and organic carbon in the Jurassic-Cretaceous Tetori Group

古盐度的指标：侏罗纪-白垩纪手取群的沉积硫和有机碳

• 发表时间: 2010
• 期刊: The Island Arc
• 作者: Hasegawa;T.;Hibino;T. and Hori;S.
• 通讯作者: S.

Numerical simulation of atmospheric and oceanic biogeochemical cycles to an episodic CO2 release event : implications for the cause of mid-Cretaceous Ocean Anoxic Event-la

大气和海洋生物地球化学循环对偶发性二氧化碳释放事件的数值模拟：对白垩纪中期海洋缺氧事件-la原因的影响

• 发表时间: 2009
• 期刊: Earth Planet.Sci.Lett. 286
• 作者: Misumi;K.;Yamanaka;Y.;Tajika;E.
• 通讯作者: E.