Asia-Pacific Journal of Atmospheric Sciences

Korean Meteorological Society (한국기상학회)
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Changes in Climate Classification and Extreme Climate Indices from a High-Resolution Future Projection in Korea

  • Yun, Kyung-Sook (Division of Earth Environmental System, College of Natural Science, Pusan National University) ;
  • Heo, Ki-Young (Division of Earth Environmental System, College of Natural Science, Pusan National University) ;
  • Chu, Jung-Eun (Division of Earth Environmental System, College of Natural Science, Pusan National University) ;
  • Ha, Kyung-Ja (Division of Earth Environmental System, College of Natural Science, Pusan National University) ;
  • Lee, Eun-Jeong (Division of Earth Environmental System, College of Natural Science, Pusan National University) ;
  • Choi, Yumi (Division of Earth Environmental System, College of Natural Science, Pusan National University) ;
  • Kitoh, Akio (Meteorological Research Institute)
  • Published : 2012.08.31
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Abstract

We investigate the future changes in the climate zone and six extreme temperature indices in Korea, using the 20-km highresolution atmospheric general circulation model (MRI-AGCM3.1S). The Trewartha and K$\ddot{o}$ppen climate classification schemes are applied, and four summer-based extreme temperature indices (i.e., summer days, tropical nights, growing degree days, and cooling degree days (CDD) and two winter-based indices (frost days and heating degree days (HDD) are analyzed. To represent significantly the change in threshold indices, the monthly mean bias is corrected in model. The model result reasonably captures the temporal and spatial distribution of the present-day extreme temperatures associated with topography. It was found that in the future climate, the area of the subtropical climate zone in Korea expands northward and increases by 21% under the Trewartha classification scheme and by 35% under the K$\ddot{o}$ppen classification scheme. The spatial change in extreme climate indices is significantly modulated by geographical characteristics in relation to land-ocean thermal inertia and topographical effects. The change is manifested more in coastal regions than in inland regions, except for that in summer days and HDD. Regions with higher indices in the present climate tend to reveal a larger increase in the future climate. The summer-based indices display an increasing trend, while the winter-based indices show a decreasing trend. The most significant increase is in tropical nights (+452%), whereas the most significant decrease is in HDD (-25%). As an important indicator of energy-saving applications, the changes in HDD and CDD are compared in terms of the frequency and intensity. The future changes in CDD reveal a higher frequency but a lower temperature than those in HDD. The more frequent changes in CDD may be due to a higher and less dispersed occurrence probability of extreme temperatures during the warm season. The greater increase in extreme temperature events during the summer season remains an important implication of projecting future changes in extreme climate events.

Keywords

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