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Korean Meteorological Society (한국기상학회)
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Characteristics and Comparison of 2016 and 2018 Heat Wave in Korea

2016년과 2018년 한반도 폭염의 특징 비교와 분석

  • Lee, Hee-Dong (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
  • Min, Ki-Hong (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
  • Bae, Jeong-Ho (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
  • Cha, Dong-Hyun (School of Urban and Environmental Engineering Ulsan National Institute of Science and Technology)
  • 이희동 (경북대학교 자연과학대학 천문대기과학과) ;
  • 민기홍 (경북대학교 자연과학대학 천문대기과학과) ;
  • 배정호 (경북대학교 자연과학대학 천문대기과학과) ;
  • 차동현 (울산과학기술원 도시환경공학부)
  • Received : 2019.09.05
  • Accepted : 2019.12.03
  • Published : 2020.03.31
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Abstract

This study analyzed and compared development mechanisms leading to heat waves of 2016 and 2018 in Korea. The European Centre for Medium-Range Weather Forecasts Reanalysis Interim (ERA Interim) dataset and Automated Surface Observing System data are used for synoptic scale analysis. The synoptic conditions are investigated using geopotential height, temperature, equivalent potential temperature, thickness, potential vorticity, omega, outgoing longwave radiation, and blocking index, etc. Heat waves in South Korea occur in relation to Western North Pacific Subtropical High (WNPSH) pressure system which moves northwestward to East Asia during summer season. Especially in 2018, WNPSH intensified due to strong large-scale circulation associated with convective activities in the Philippine Sea, and moved farther north to Korea when compared to 2016. In addition, the Tibetan high near the tropopause settled over Northern China on top of WNPSH creating a very strong anticyclonic structure in the upper-level over the Korean Peninsula. Unlike 2018, WNPSH was weaker and centered over the East China Sea in 2016. Analysis of blocking indices show wide blocking phenomena over the North Pacific and the Eurasian continent during heat wave event in both years. The strong upper-level ridge which was positioned zonally near 60°N, made the WNPSH over the South Korea stagnant in both years. Analysis of heat wave intensity (HWI) and duration (HWD) show that HWI and HWD in 2018 was both strong leading to extreme high temperatures. In 2016 however, HWI was relatively weak compared to HWD. The longevity of HWD is attributed to atmosphere blocking in the surrounding Eurasian continent.

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References

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