Atmospheric radiocarbon variation during the past 50 ka by the high-resolution analysis of heaven lake sediment

天湖沉积物高分辨率分析近50 ka大气放射性碳变化

• 批准号: 20310007
• 负责人: KITAGAWA Hiroyuki
• 金额: $ 12.06万
• 依托单位: Nagoya 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-20310007/
• 关键词: 炭素14; 天池; 湖沼堆積物; 炭素循環; 編年; 画像解析; 炭素14年代キャリブレーション; c中国東北部; 地球化学分析; 炭素14年代; UV観察; LA-ICPMS; 装置開発

To investigate the ^<14>C variations in atmospheric CO_2 (^<14>CO_2) during the past 50 ka, we had a high-resolution analyses of the heaven lake sediments from Heilongjiang and Inner Mongolia, northeastern China. We focused on three subjects in this research ; (1) development of analytical methods for reading out climatic signals form the heaven lake sediments with a high-temporal resolution, (2) establishment of high-precision AMS ^<14>C measurements for small-size sample and enhancement of sample preparation throughput and (3) numerical model experiments for reconsidering the atmospheric ^<14>CO_2 changes and marine response on atmospheric changes for ^<14>CO_2.We have developed the system of automatic UV-image analyze and laser-induced breakdown spectroscopy (LIBS) for sediment core analysis. Although we applied newly developed method to the heaven lake sediments, we need more experiments for detecting climatic signals. With a collaboration with UCI-KCCAMS (USA) and KIGAM (Korea), we developed an automatic preparation system for AMS ^<14>C measurement (for >0.3 mg C) and established a technique for extremely small samples (0.07～0.3 mg C). We are planning to apply these techniques developed to the other lake sediments. Finally we modified a global carbon cycle model, and discussed about the ^<14>C response of atmospheric ^<14>CO_2 changes on marine reservoir using the available data set.

为研究近50 ka来<14>大气CO_2（^ CO_2）中^ C的变化<14>，对黑龙江和内蒙古天湖沉积物进行了高分辨率分析。本研究主要围绕三个方面展开：（1）建立高时间分辨率阅读天池沉积物气候信号的分析方法;（2）建立小样本高精度AMS ^<14>C测量方法，提高样品制备能力;（3）开展数值模式实验，重新考虑大气^<14>CO_2变化和海洋对大气^CO_2变化的响应<14>。虽然我们将新发展的方法应用到天池沉积物中，但对气候信号的检测还需要更多的实验。我们与UCI-KCCAMS（美国）和KIGAM（韩国）合作，开发了用于AMS ^<14>C测量（&gt;0.3 mg C）的自动制备系统，并建立了用于极小样品（0.07~0.3 mg C）的技术。我们正计划将这些技术应用于其他湖泊沉积物。最后，本文对一个全球碳循环模型进行了修正，并<14><14>利用已有的数据讨论了大气CO_2变化对海洋储层碳的响应。

项目成果

Mg isotopes in chlorophyll-a and coccoliths of cultured coccolithophores (Emiliania huxleyi) by MC-ICP-MS

• DOI: 10.1016/j.marchem.2010.07.004
• 发表时间: 2010-10
• 期刊: Marine Chemistry
• 影响因子: 3
• 作者: K. Ra;H. Kitagawa;Y. Shiraiwa

Lacustrine varves as a dating technique : advantages and disadvantages(Edited by M. Francesco)

湖相水藻作为测年技术：优点和缺点（由 M. Francesco 编辑）

• 作者: 山口潤;鷹野敏明;高村民雄;中西裕治;河村洋平;阿部英二;堀江宏昭;大野裕一;角皆潤,小松大祐,代田里子,桑原潤,中川書子;北川浩之
• 通讯作者: 北川浩之

Late Holocene vegetation changes and human impact in the Changbai Mountains area, Northeast China

• DOI: 10.1016/j.quaint.2007.09.010
• 发表时间: 2008-06
• 期刊: Quaternary International
• 影响因子: 2.2
• 作者: M. Makohonienko;H. Kitagawa;T. Fujiki;Xin Liu;Y. Yasuda;H. Yin

土壌・堆積物(日本地球化学会(監修),田中剛・吉田尚弘(編集))(地球化学講座第8巻「地球化学実験法」)

土壤和沉积物（日本地球化学会（编）、田中刚和吉田直宏（编））（地球化学课程第 8 卷“地球化学实验方法”）

• 发表时间: 2010
• 作者: 佐藤千恵;黒木由貴子;陳剛;内田昌男;内海真生;加茂浩靖;北川浩之
• 通讯作者: 北川浩之

The Oxford Handbook of Wetland Archaeology(Chapter 39, Lacustrine varves as a dating technique : advantages and disadvantages)

牛津湿地考古学手册（第 39 章，湖底藻类作为年代测定技术：优点和缺点）

• 发表时间: 2011
• 作者: 佐藤千恵;黒木由貴子;陳剛;内田昌男;内海真生;北川浩之(分担執筆);久保倫子;埴淵知哉・花岡和聖・村中亮夫・中谷友樹;小松大祐;H.Kitagawa(分担執筆)
• 通讯作者: H.Kitagawa(分担執筆)