우리나라 지중온도 변동의 기후학적 특성 = Climatological Characteristics in the Variation of Soil Temperature in Korea

다국어 초록 (Multilingual Abstract)

Climatological characteristics in the variation of soil temperatures in Korea were investigated using Korea Meterological Administration’s observation data. And the impacts of soil moisture on the variation of soil temperature were examined using observed precipitation data. The climatological averages of soil temperatures are ranged from 14.4 to 15.0oC regardless of depths. And they showed an latitudinal gradient with a warm temperature at the southern region and“U” shape as in the air temperature with a high value along the coastal region. The relatively higher heat capacity and low conductivity of soil compared to those of the air resulted in the significant delay of the maximum and minimum date with depth. As a results, soil acts as a heat source during winter while a heat sink during summer. Global warming and urban heat island have increased the soil temperatures with an average rate 0.3~0.5oC/10-year as in the air temperature during last 30 years (1973~2002). However, the warming rate is maximized during spring contrary to the winter in the air temperature. The temporal variation of soil temperatures is strongly affected by that of soil moisture through an modification of the heat capacity and heat convection. In general, the increased soil moisture clearly decreased the temporal variations and increased the deep layer soil temperatures during cold season.

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