Development of a technology to continuously scan cluster strength of c-axis of ice crystals within ice cores with high spatial resolutions

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K12194
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis
• Research Institution: National Institute of Polar Research
• Principal Investigator: Fujita Shuji 国立極地研究所, 研究教育系, 准教授 (30250476)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 氷 / アイスコア / フィルン / 誘電率 / 誘電異方性 / 複屈折 / マイクロ波 / 結晶主軸方位

Outline of Final Research Achievements

Purpose of this study was to develop and to accomplish a new method to measure strength of birefringence of microwave within ice cores continuously. I developed a system of open resonator of microwave, and evaluated dielectric permittivity of ice and ice cores at frequency range of 15 -20 GHz. I challenged to measure dielectric permittivity tensor of ice specimen with 75-mm thickness. This attempt was successful; I was able to measure it with a spatial resolution of ~30mm. In the light of the purpose of this study, it was truly a breakthrough. Because of accomplishment of this technology, we are now able to innovate understanding for processes of metamorphism and deformation of snow, firn and ice in polar ice sheets.

Free Research Field

環境学　環境動態解析