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여름을 제외한 다른 계절의 온난화 혹은 일 최저기 온에 대한 온실효과와 도시열섬효과에 관한 연구가 활 발히 수행되었던 것에 비하면 여름철의 기온상승, 특 히 일 최고기온의 상승에 대한 연구는 미흡하다. 최근 25년간 전국 18개 지점에서 관측된 우리나라의 여름철 (6-8월) 일 최고기온 변화를 조사하고 그 변화에 미친 일사량의 영향을 분석한 결과, 평년(1971-2000)에 비 해 하루 평균 일사량은 0.61MJ m−2 증가하였으며 같 은 기간 일 최고기온은 0.1oC 상승한 것으로 확인된 다. 이 기간 중 일사량의 연차변이는 여름 최고기온 연차변이의 65%를 설명할 수 있었다. 일사량의 증가 는 대기투과율의 증가에 기인하며 대기투과율의 증가 는 에어로졸 농도 특히 아황산가스 농도 감소 때문인 것으로 판단된다. 1999년부터 2007년까지 여름철 아황산가스 농도가 계속 감소해왔는데 이와 같은 경향이 앞으로도 지속된다면 대기투과율 증가 및 이에 따른 일사량 증가와 증가된 일사량으로 인한 최고기온 상승 을 예상할 수 있다.


Few studies have attempted to analyze variations of daily maximum temperature in the summer whereas many studies have analyzed warming trends in other seasons with respect to greenhouse gases or urban heat islands. We analyzed daily maximum temperature data for the summer season (June to August) at 18 locations in South Korea from 1983 to 2007. Compared to the climatic normal (from 1971 to 2000), an average increase of 0.1oC was found for the summer daily maximum temperature along with an increase of 0.61MJ m−2 in daily solar radiation. Approximately 65% of the annual variations of the summer daily maximum temperature could be explained by the solar radiance alone. Higher atmospheric transmittance due to lower aerosol concentration (especially of sulfur dioxide) is believed to have caused the recent increase in solar irradiance. Daily maximum temperature of the summer is expected to keep rising if the clean air activities are maintained in the future.


Few studies have attempted to analyze variations of daily maximum temperature in the summer whereas many studies have analyzed warming trends in other seasons with respect to greenhouse gases or urban heat islands. We analyzed daily maximum temperature data for the summer season (June to August) at 18 locations in South Korea from 1983 to 2007. Compared to the climatic normal (from 1971 to 2000), an average increase of 0.1oC was found for the summer daily maximum temperature along with an increase of 0.61MJ m−2 in daily solar radiation. Approximately 65% of the annual variations of the summer daily maximum temperature could be explained by the solar radiance alone. Higher atmospheric transmittance due to lower aerosol concentration (especially of sulfur dioxide) is believed to have caused the recent increase in solar irradiance. Daily maximum temperature of the summer is expected to keep rising if the clean air activities are maintained in the future.