Ice core dating by the use of seasonal change of chemical elements concentration

利用化学元素浓度季节变化进行冰芯测年

• 批准号: 06453206
• 负责人: NAKAWO Masayoshi
• 金额: $ 2.94万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06453206/
• 关键词: ice core; dating; chemical elements; seasonal change; snow metamorphism; 年代推定; 化学物質濃度; 安定同位体; 結晶粒径

In 1995, the time evolution of the concentration of various chemical elements has beem observed with series of samples taken from a snow pack in a period of mid-winter to early spring at Saiho, Niigata Prefecture, Japan. In this observation, it was found that the concentration of the chemical elements such as ion concentration, particle concentration and isotope ratio has been preserved within the snow pack even with the wet metamorphism of snow after the snow melting season started.In 1996, Vartical profiles for these elements have been analyzed with ice cores retrieved at Antarctic, Arctic and Asian highland regions. The dating of the cores has been tried by counting the annual cycle of the concentration of these elements, and compared with the dating results made by the other methods. It was found that the counting method would provide reasonable age for both the polar cores which has experienced no melting and Asian highland cores which has been subjected to summer melting. It is concluded that counting annual layrs is a useful tool to date ice cores either from polar or non-polar regions.

1995年，通过从日本新泻县西保市仲冬至早春期间的积雪中采集的一系列样品，观察到了各种化学元素浓度随时间的变化。在这次观测中，发现即使在融雪季节开始后雪发生湿变质作用，离子浓度、颗粒浓度和同位素比等化学元素的浓度仍保留在积雪内。1996年，利用在南极、北极和亚洲高原地区取回的冰芯分析了这些元素的垂直剖面。通过计算这些元素浓度的年周期来尝试对岩心进行测年，并与其他方法得出的测年结果进行比较。研究发现，该计数方法可以为未经历过融化的极地核心和经历过夏季融化的亚洲高原核心提供合理的年龄。结论是，计算年层数是确定极地或非极地冰芯年代的有用工具。

项目成果

Yoshida, N., P.Vijarnsorn et al.: "Radiatively active gases in tropical forest II.Dynamics and frame-work with emphasis on swamp forest in Narathiwat, Thaliand." Proc.Intl.Symposium on Tropical Rain Forests in a Global Greenhouse.(in press). (1996)

Yoshida, N.、P.Vijarnsorn 等人：“热带森林中的辐射活性气体 II.动力学和框架，重点关注泰国那拉提瓦的沼泽森林。”

Azuma, N., K., Goto-Azuma and M.Nakawo: "Photometric analysis of a 100 m ice core from Asuka Camp, East Antarctica : Preliminary results." Bulletin of Glacier Research. 12. 69-76 (1994)

Azuma, N.、K.、Goto-Azuma 和 M.Nakawo：“对东南极洲明日香营地 100 m 冰芯进行光度分析：初步结果。”

Goto-Azuma, K., M.Nakawo, Han Jiankang, O,Watanabe and N.Azuma: "Melt-induced relocation of ions in glaciers and in a seasonal snow pack" IAHS Publication. 223. 287-297 (1994)

Goto-Azuma, K.、M.Nakawo、Hanjiankang、O、Watanabe 和 N.Azuma：“融化引起的冰川和季节性积雪中离子的迁移”IAHS 出版物。

Goto-Azuma, K., R.M.Koerner, J,Sekarka, M.Nakawo and A.Kudo: "Snow chemistry on the Agassiz Ice Cap in the Canadian high Arctic." Proc.Intl.Arctic Science Symposium. B50-B56 (1995)

Goto-Azuma, K.、R.M.Koerner、J、Sekarka、M.Nakawo 和 A.Kudo：“加拿大高北极阿加西冰盖上的雪化学。”

Nakawo, M.: "Asian ice core data for reconstructing past temperature change." Proc.IGBP-PAGES/PEP-2 Symposium on Plaeoclimate and Environmental Variability Austral-Asian Transect during the Past 2000 Years. (in press). (1996)

Nakawo, M.：“用于重建过去温度变化的亚洲冰芯数据。”