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Cha, Dong-Hyun
High-impact Weather Prediction Lab (HWPL)
Research Interests
  • Typhoon Modeling, Regional Climate Modeling, High-impact Weather

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The Role of the Pacific‐Japan Pattern in Extreme Heatwaves Over Korea and Japan

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Title
The Role of the Pacific‐Japan Pattern in Extreme Heatwaves Over Korea and Japan
Author
Noh, ElKim, JoowanJun, Sang‐YoonCha, Dong-HyunPark, Myung‐SookKim, Joo‐HongKim, Hyeong‐Gyu
Issue Date
2021-09
Publisher
American Geophysical Union
Citation
GEOPHYSICAL RESEARCH LETTERS, v.48, no.18, pp.e2021GL093
Abstract
In the Northwestern Pacific, the meridionally propagating Rossby waves, known as the Pacific-Japan (PJ) pattern, is the dominant teleconnection pattern and is considered as a source of heatwaves in East Asia. In this study, the circulation and thermodynamic characteristics of these patterns were investigated based on daily timescale to evaluate their relationship with the likelihood of heatwaves in Korea and Japan. The investigations reveal that stations in Korea and Japan record approximately 90% increase in extremely hot days (Tmax > 35°C) during the positive PJ pattern events. According to thermodynamic budget, horizontal heat advection is a key factor for the observed near-surface warming during the positive PJ. The circulation pattern during the positive PJ largely explains the enhanced warm advection and physical heating due to the increased insolation and adiabatic heating are secondary factors for near-surface warming. This phenomenon is robustly observed regardless of the definition.
URI
https://scholarworks.unist.ac.kr/handle/201301/54066
URL
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL093990
DOI
10.1029/2021gl093990
ISSN
0094-8276
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