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Korean Meteorological Society (한국기상학회)
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Effects of Land Cover Change on Summer Urban Heat Island Intensity and Heat Index in Seoul Metropolitan Area, Korea

서울 수도권 지역의 토지 피복 변화가 여름철 도시열섬 강도와 체감온도에 미치는 영향

  • Hong, Seon-Ok (Innovative Meteorological Research Department, National Institute of Meteorological Sciences) ;
  • Byon, Jae-Young (Innovative Meteorological Research Department, National Institute of Meteorological Sciences) ;
  • Kim, Do-Hyeong (Innovative Meteorological Research Department, National Institute of Meteorological Sciences) ;
  • Lee, Sang-Sam (Innovative Meteorological Research Department, National Institute of Meteorological Sciences) ;
  • Kim, Yeon-Hee (Innovative Meteorological Research Department, National Institute of Meteorological Sciences)
  • 홍선옥 (국립기상과학원 미래기반연구부) ;
  • 변재영 (국립기상과학원 미래기반연구부) ;
  • 김도형 (국립기상과학원 미래기반연구부) ;
  • 이상삼 (국립기상과학원 미래기반연구부) ;
  • 김연희 (국립기상과학원 미래기반연구부)
  • Received : 2021.01.04
  • Accepted : 2021.03.20
  • Published : 2021.06.30
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Abstract

This study investigates the impacts of land cover change due to urbanization on the Urban Heat Island Intensity (UHII) and the Heat Index (HI) over the Seoul metropolitan area using the Unified Model (UM) with the Met Office Reading Urban Surface Exchange Scheme (MORUSES) during the heat wave from 16, July to 5, August 2018. Two simulations are performed with the late 1980s land-use (EXP1980) and the late 2000s land-use (EXP2000). EXP2000 is verified using Automatic Weather Station (AWS) data from 85 points in the study area, and observation sites are classified into two categories according to the urban fraction change over 20 years; Category A is 0.2 or less increase, and Category B is 0.2 or more increase. The 1.5-m temperature and relative humidity in Category B increase by up to 1.1℃ and decreased by 7% at 1900 LST and 2000 LST, respectively. This means that the effect of the urban fraction changes is higher at night. UHII increases by up to 0.3℃ in Category A and 1.3℃ in Category B at 1900 LST. Analysis of the surface energy balance shows that the heat store for a short time during the daytime and release at nighttime with upward sensible heat flux. As a result of the HI, there is no significant difference between the two experiments during the daytime, but it increases 1.6℃ in category B during the nighttime (2200 LST). The results indicate that the urbanization increase both UHII, and HI, but the times of maximum difference between EXP1980 and EXP2000 are different.

Keywords

Acknowledgement

이 연구는 기상청 국립기상과학원 「수요자 맞춤형 기상정보 산출기술개발 연구」(KMA2018-00622)의 지원으로 수행되었습니다.

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