• Title/Summary/Keyword: 도시승온화

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Analysis of Urban Warming Phenomenon using Degree days in Major Korean Cities (냉난방도일을 이용한 우리나라 주요도시의 도시승온화현상 특성분석)

  • Kim, Hae Dong;Park, Myeong Hui;Song, Gyeong Suk
    • Journal of Environmental Science International
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    • v.13 no.3
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    • pp.189-196
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    • 2004
  • Characteristics of urban wanning phenomenon were studied using degree days for three big cities(Seoul, Busan, Daegu) adjacent to airport. Time variation of the cooling and heating degree days was analyzed using the daily mean air temperature data measured at the six meteorological observatory for long-term periods(25~43years). The results for the big cities are as followings: 1) It was found that the heating degree days trended to decrease from year to year. 2) The cooling degree days were nearly unchanged during the same analysis periods. 3) The number of days calling for air-heating also tended to decrease as time passes. 4) Those of air-cooling were nearly unchanged during the same time. It suggests that the change of air-heating condition owing to urbanization came in evidence in the winter season, but that of air-cooling condition was slight in the summer season. On the other hand, the long-term trends of degree days were very small in airport areas except for Kimhae airport. Hence, the gaps of degree days between big cities and rural airport areas are increasing.

An Observational Study of Parked Cars' Effect in the Sunshine on the Increase of Air Temperature (자동차 양지주차가 기온상승에 미치는 영향에 관한 관측적 연구)

  • Ahn, Ji-Suk;Koo, Hyun-Suk;Park, Myung-Hee;Kim, Hae-Dong
    • Journal of the Korean earth science society
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    • v.28 no.1
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    • pp.45-53
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    • 2007
  • This study investigated the effect of parked cars in the sunshine on the increase of air temperature on a sunny day. Air temperatures were determined both from inside of the parked cars and the top surface of the vehicle at which one car was parked under the sunshine and the other in the shade for the duration of 27 hours. The surface temperatures of asphalt and bare soil were simultaneously measured in both locations, sunshine and shade areas, along with a couple of meteorological factors. The sensible heat fluxes from the surfaces of asphalt, bare soil and two vehicles were estimated by utilizing those observed data. The results are as follows; 1) The surface temperatures of bare soil, asphalt and two vehicles increased with $30{\sim}37^{\circ}C,\;37{\sim}46^{\circ}C\;and\;42{\sim}49^{\circ}C$ respectively during the day. 2) The sensible heat fluxes were noticeably higher from the top surface of the parked vehicle in the sunshine than from the asphalt or bare soil. The differences of sensible heat fluxes between the vehicle's roof and the other two surfaces of asphalt and bare soil were 60 (asphalt) and 85 (bare soil) $W/m^2$ during the daytime.