Characteristic of East Asia climatic changes and its synchronization with global climatic changes

本文研究了全球、亚洲和东亚三个不同空间尺度的陆地气候变化特征。主要研究方向为：(1)气候变化重建不够充分的陆地区域气候重建；(2)海洋、陆地和极地气候变化记录的年代匹配。研究还发展了湖泊沉积物中硅藻化石的硅氧同位素分析、沉积物中硅藻化石的提取方法和湖泊沉积物纤维素的同位素等古环境研究所必需的方法，这些方法被认为是气候变化的有效代理。我们成功开发了测定硅藻化石硅和氧同位素变化的新方法（激光和批量法），湖泊沉积物纤维素碳和放射性碳同位素变化的新方法。这些方法将是研究陆地气候变化的有效方法。这些研究将提供三个不同空间尺度的陆地气候变化的详细信息。指出了大西洋和太平洋地区末次冰期至间冰期气候变化格局的差异。

The aim of this research is to characterize the terrestrial climatic changes for three different spatial-scales of global, Asia, and East Asia. Major research subjects are as follows: (1) climate reconstruction in land region where enough climate change reconstruction is not done, (2) chronological matching among the records of climatic changes obtained from ocean, land and poles. The research has also developed the methods necessary for paleoenvironmental studies such as silicon and oxygen isotope analyses of the diatom fossil in lake sediment, the extraction method of the diatom fossil from the sediments and the isotope of lake sediment cellulose, which are thought to be effective as a climate change proxy. We have successfully developed new methods for determining the silicon and oxygen isotope changes of fossil diatom (laser- and batch methods), the carbon and radiocarbon isotope changes of lake sediment cellulose. These methods will be effective for investigating the terrestrial climatic changes. These R＆D will give the detailed information on terrestrial climatic changes for three different spatial-scales. It is remarked that the difference of the climate change pattern from the last glacial period to interglacial in the Atlantic Ocean region and the Pacific Ocean region were identified.