STUDIES ON EFFECTS OF THE ARCTIC CRYOSPHERE ON GLOBAL CHANGE

1. 在挪威和法国的合作下，在斯瓦尔巴群岛的Austfonna钻取了一个289米深的冰芯。对岩心进行了ECM、稳定氧同位素和离子分析。岩心记录了过去700年的气候和环境变化。稳定的同位素变化表明，1780年至1920年，斯瓦尔巴群岛经历了一个寒冷期，而快速变暖发生在1920年代。另一方面，ECM分析显示了Laki和hekla 2等全球规模火山喷发的信号。在加拿大地质调查局的合作下，对加拿大北极德文冰帽进行了钻孔试验和冰川观测。德文冰帽上多个雪坑的样本进行了离子分析。结果表明，海盐、甲酸和钙的浓度随海拔的升高而迅速下降，而MSA的浓度与海拔无关。在与中国湖南师范大学的合作下，在东昆仑山的一个冰川上收集了表面积雪样本。这些样品被带回日本进行化学分析。

1. A 289m deep ice core was drilled on Austfonna, Svalbard under the collaboration with Norway and France. The core was analyzed for ECM, stable oxygen isotope, and ions. The core records the climatic and environmental changes over the past 700 years. Stable isotope variations indicate that there was a cold period from 1780 to 1920 in Svalbard, and that rapid warming took place in 1920s. On the other hand, ECM analyses show the signals of global scale volcanic eruptions such as Laki and Hekla.2. Drill test and glaciological observations were carried out on Devon Ice Cap, Canadian Arctic under the collaboration with the Geological Survey of Canada. Samples from multiple snow pits on Devon Ice Cap were analyzed for ions. The results show that concentrations of sea salts, formic acid, and calcium decrease rapidly with altitude, and that concentration of MSA does not depend on altitude.3. Under the collaboration with Hunan Normal University, China, sruface snow samples were collected on a glacier in the East Kunlun Mountains. The samples were brought back to Japan and analyzed for chemistry.