대기 (Atmosphere)

  • 제21권3호
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  • Pages.229-241
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  • 2011
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  • 1598-3560(pISSN)
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  • 2288-3266(eISSN)
한국기상학회 (Korean Meteorological Society)
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한반도 중부지역에서 약한 강수에 미치는 도시화 효과

Effect of urbanization on the light precipitation in the mid-Korean peninsula

  • 은승희 (강릉원주대학교 대기환경과학과) ;
  • 채상희 (강릉원주대학교 대기환경과학과) ;
  • 김병곤 (강릉원주대학교 대기환경과학과) ;
  • 장기호 (국립기상연구소 응용기상연구과)
  • Eun, Seung-Hee (Department of Atmospheric Environmental Sciences, Gangneung-Wonju National University) ;
  • Chae, Sang-Hee (Department of Atmospheric Environmental Sciences, Gangneung-Wonju National University) ;
  • Kim, Byung-Gon (Department of Atmospheric Environmental Sciences, Gangneung-Wonju National University) ;
  • Chang, Ki-Ho (Applied Meteorology Research Laboratory, National Institute of Meteorological Research)
  • 투고 : 2011.03.18
  • 심사 : 2011.07.07
  • 발행 : 2011.09.30
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초록

The continuous urbanizations by a rapid economic growth and a steady increase in population are expected to have a possible impact on meteorology in the downwind region. Long-term (1972~2007) trends of precipitation have been examined in the mid-Korean peninsula for the westerly condition only, along with the sensitivity simulations for a golden day (11 February 2009). During the long-term period, both precipitation amount (PA) and frequency (PF) in the downwind region (Chuncheon, Wonju, Hongcheon) of urban area significantly increased for the westerly and light precipitation ($PA{\leq}1mm\;d^{-1}$) cases, whereas PA and PF in the mountainous region (Daegwallyeong) decreased. The enhancement ratio of PA and PF for the downwind region vs. urban region remarkably increased, which implies a possible urbanization effect on downwind precipitation. In addition, the WRF simulation applied for one golden day demonstrates enhanced updraft and its associated convergence in the downwind area (about 60 km), leading to an increase in the cloud mixing ratio. The sensitivity experiments with the change in surface roughness demonstrates a slight increase in cloud water mixing ratio but a negligible effect on precipitation in the upwind region, whereas those with the change in heat source represents the distinctive convergence and its associated updraft in the downwind region but a decrease in liquid water, which may be attributable to the evaporation of cloud droplet by atmospheric heating induced by an increase in an anthropogenic heat. In spite of limitations in the observation-based analysis and one-day simulation, the current result could provide an evidence of the effect of urbanization on the light precipitation in the downwind region.

키워드

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