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Migration of atmospheric aerozols into snow and ice Core, forming signals

大气气溶胶迁移到雪和冰核心中，形成信号

基本信息

批准号：
08458148
负责人：
WATANABE Okitsugu
金额：
$ 4.16万
依托单位：
NATIONAL INSTITUTE OF POLAR RESEARCH, JAPAN
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

Many substances are transported from the atmosphere into snow and ice layers on the earth surface. Some of them are preserved in the original state and others after receiving the digenetic processes. They show the unique signals in the snow and ice layers as the information on sedimentary environments and climate.The substances of aerosol origin in the layers have close relation with atmospheric conditions through the transportation and migration processes, and are considered to be the important signals for the environments.The research was concentrated the following 4 topics. 1). depositional process through the atmosphere onto the earth. 2). secondary migration and transportation processes through the snow layers. 3). fixing process from firm to ice. 4). formation process of signals recorded in the ice core.The aerosols of various origins are transported into polar regions through the atmospheric circulation and preserved into snow layers through sedimentation. Stable isotopic ratio and chemical features in snow layers are reflected by the atmospheric and sedimentation processes. The processes are not so simple by the various localities.Ice cores in the polar regions have various signals, having possibly fruitful information. The process for the signal formation is now not so clear.In the research, we made the field observation for the process of aerozol deposition onto snow surface, with the discussion on global transportation of radio nuclide of artificial origin. Through the research during two years, the origin and chemical reaction with seasonal distribution were discussed.

许多物质从大气中转移到地球表面的雪和冰层中。其中一些保留了原始状态，另一些则在经历了成岩过程后得以保存。它们将雪层和冰层中特有的信号展现为沉积环境和气候的信息。层中的气溶胶来源物质通过输送和迁移过程与大气条件有着密切的关系，被认为是环境的重要信号。研究集中在以下4个主题。 1）。穿过大气层到达地球的沉积过程。 2）。穿过雪层的二次迁移和运输过程。 3）。从坚固到冰的固定过程。 4).冰芯中记录的信号形成过程。各种来源的气溶胶通过大气环流输送到极地，并通过沉积保存到雪层中。雪层中的稳定同位素比和化学特征是由大气和沉积过程反映的。各地的过程并不那么简单。极地的冰芯有不同的信号，可能蕴藏着丰富的信息。其信号形成过程目前尚不十分清楚。在研究中，我们对气溶胶沉积在雪面上的过程进行了现场观测，并对人工放射性核素的全球传输进行了讨论。通过两年的研究，探讨了其起源和化学反应与季节分布。