연구논문 : 남극 세종과학기지에서 지표면 온도변화에 따른 동토의 온도 반응

Borehole temperature measurements at Sejong station were made by the geothermal datalogger which was designed by the investigator. During December 31, 1991-February 1,1992 six temperature data (at the depth of 28 ㎝, 8 ㎝, -12 ㎝, -32 ㎝, -52 ㎝, and - 70 ㎝) were obtained by resistive sensors of CR10 and SM716 every one minute. Fast Fourier Transformation was made on seven temperature data including surface air temperature of meteorological center at Sejong $ase every thirty minutes. Profiles of surface and subsurface temperature variations represent freezing, thawing, and heat transfer mechanism at the boundary between active layer and permafrost table. The thermal diffusivities are determined by the A¨ngstrom method using underground temperatures. The thermal conductivities of the drilled cores and outcrops are measured by the transient method. The thermal diffusivity and conductivity measurements of rock and soil samples give a significant signal on the inferred climatic temperature of the past millenium at Sejong Base by the inversion technique with well-documented meteorological data. The geothermal data in ice-bearing permafrost at Sejong scientific station are interpreted in terms of the temperature history on a time scale of 2,000 years. Two theories are developed: a $quot;forward$quot; theory to calculate the response of ice-bearing permafrost to the surface temperature disturbance, and an $quot;inverse$quot; theory to calculate parameters characterizing the surface temperature history from suitable measurements in the permafrost.