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Since the rapid urbanization period coincides with the start of global warming, climate data might becontaminated with urbanization efect in Korea. Monthly normals of daily minimum, maximum, andmean temperature of 14 stations were calculated for 1951-1980 and 1971-2000 periods. Differences intwo temperature normals were regressed to the natural logarithms of population increase atcorresponding 14 cities from 1966 to 1990. The regression models were used to remove potentialeffects of urbanization from the apparent warming, and to determine the net contribution of globalwarming to the temperature change in Korea during the recent half century. Acording to the modelcalculation, there was little evidence of global warming in the warm season (May through November),while urbanization effect was common in all season except April. Up to 0.5oC warming of nighttimetemperature was found to be induced by urbanization. Col season temperature was increased by upto 0.6oC due mainly to the global warming of daytime temperature.