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Ice core analyses for 1000 year climatic and environmental records in Bi-polar Region.

两极地区 1000 年气候和环境记录的冰芯分析。

基本信息

批准号：
02452060
负责人：
WATANABE Okitsugu
金额：
$ 3.33万
依托单位：
National Institute of Polar Research (N.I.P.R.)
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

项目摘要

The ice sheets and glaciers were constructed under the various conditions depending upon the local climatic environments in the region. By identify the sedimentary environments in various regions, the ice core analyses possibly make clear the global environments as well as the local sedimentary environment. For the pursuit, it is necessary to treat the various ice cores with the same procedure and to give the cores the time scales not depending upon the local environments. We obtained various data from the ice cores in both polar regions, some of which were utilized for the estimations of core dating and of the past sedimentary environments. Recently with the progress of technology, the various kinds of data were newly obtained and used for the estimation. In the project, we consider the new methods now in progress, covering the classic methods, and try to find the standard core analytical methods for the cores in various regions at once. With the estimation of sedimentation rate, the … More first order dating for the whole ice core was carried out from the glacier flow models. Several time markers for the ice cores were determined from the information for the concentrations of the substances originating from the volcanic activities and of the artificial radio nuclides occurring in the ice layer. The final core dating was carried out by the mutual correlation with the flow models and the time markers. The vertical distributions of stable isotopes (deltaO^<18>) , the main components derived from the sea salts, micro particles and the artificial substances from human activities were obtained to estimate the fluctuations of the paleo temperature and precipitation rate as well as the sedimentary environments. The vertical fluctuations in the core were translated into periodical one by the core dating data to create the paleo global climate system in these hundred years including both polar regions. Recently the volcanic activities reflected in the ice core were considered to be the useful indicator to recognize the date of deposition, especially for the cores in Arctic region. Both of DC electric conductivity method and Dielectric profile method were utilized to the ice cores in both polar regions and some continuous data were obtained. Many signals of the volcanic activities were detected in the cores in Antarctica. Especially the signals from the activities of Tanbora(1815) and of Unknown(1601) were detected in both polar region with the recognized profiles and confirmed to be the marked layer for the dating in the Antarctic glaciers as well as the Arctic glaciers. As almost all signals have not been recognized yet, there remains much possibility for us to use as the time markers in the progress of the investigation. Though the sedimentary environments (hiatus periods, large fluctuation of the annual precipitation), which characterize the Antarctic glaciers, have made the core records more complicated, such an investigation will make the core data more us Less

冰盖和冰川是在各种条件下形成的，这取决于该地区当地的气候环境。冰芯分析通过对不同地区沉积环境的识别，不仅可以了解局部沉积环境，而且可以了解全球环境。为了追踪，有必要用相同的程序处理各种冰芯，并赋予冰芯不依赖于当地环境的时间尺度。我们从这两个极地地区的冰芯中获得了各种数据，其中一些数据被用于估计冰芯测年和过去的沉积环境。近年来，随着科学技术的进步，各种各样的数据被新获得并用于估计。在本项目中，我们考虑了目前正在发展的新方法，涵盖了经典方法，并试图同时找到适用于不同地区岩心的标准岩心分析方法。通过对沉积速率的估算， ...更多信息根据冰川流模型对整个冰芯进行了一级年龄测定。根据火山活动产生的物质和冰层中出现的人工放射性核素的浓度信息，确定了冰芯的几个时间标志。通过流动模型和时间标志物的相互关系，进行了最终的岩心定年。通过对稳定同位素（δ O_2）、<18>海盐、微量颗粒物和人为物质的垂向分布特征的分析，探讨了古温度、降水量的变化规律以及沉积环境。通过岩芯测年数据将岩芯中的垂直波动转化为周期波动，建立了近百年来包括两极地区在内的古全球气候系统。近年来，冰芯中反映的火山活动被认为是识别沉积年代的有用指标，特别是对于北极地区的冰芯。对两个极区的冰芯分别采用直流电导率法和介电剖面法，得到了一些连续的数据。在南极洲的岩芯中发现了许多火山活动的信号。特别是Tanbora（1815）和Unknown（1601）的活动信号在两个极区都被探测到，并被确认为南极冰川和北极冰川定年的标志层。由于几乎所有的信号都还没有被识别出来，我们仍然有很大的可能性作为时间标记在调查的进展。虽然南极冰川的沉积环境（间断期、年降水量的大幅度波动）使岩芯记录更加复杂，但这样的调查将使岩芯数据更加丰富。