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Analyzing Spatial and Temporal Variation of Ground Surface Temperature in Korea  

Koo Min-Ho (Department of Geoenvironmental Sciences, Kongju National University)
Song Yoon-Ho (Groundwater & Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resources)
Lee Jun-Hak (Intellegeo Co., Ltd.)
Publication Information
Economic and Environmental Geology / v.39, no.3, 2006 , pp. 255-268 More about this Journal
Abstract
Recent 22-year (1981-2002) meteorological data of 58 Korea Meteorological Adminstration (KMA) station were analyzed to investigate spatial and temporal variation of surface air temperature (SAT) and ground surface temperature (GST) in Korea. Based on the KMA data, multiple linear regression (MLR) models, having two regression variables of latitude and altitude, were presented to predict mean surface air temperature (MSAT) and mean ground surface temperature (MGST). Both models showed a high accuracy of prediction with $R^2$ values of 0.92 and 0.94, respectively. The prediction of MGST is particularly important in the areas of geothermal energy utilization, since it is a critical parameter of input for designing the ground source heat pump system. Thus, due to a good performance of the MGST regression model, it is expected that the model can be a useful tool for preliminary evaluation of MGST in the area of interest with no reliable data. By a simple linear regression, temporal variation of SAT was analyzed to examine long-term increase of SAT due to the global warming and the urbanization effect. All of the KMA stations except one showed an increasing trend of SAT with a range between 0.005 and $0.088^{\circ}C/yr$ and a mean of $0.043^{\circ}C/yr$. In terms of meteorological factors controlling variation of GST, the effects of solar radiation, terrestrial radiation, precipitation, and snow cover were also discussed based on quantitative and qualitative analysis of the meteorological data.
Keywords
GST; SAT; Multiple linear regression analysis; Ground source heat pump system;
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