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The Role of the Pacific‐Japan Pattern in Extreme Heatwaves Over Korea and Japan
Author(s) -
Noh El,
Kim Joowan,
Jun SangYoon,
Cha DongHyun,
Park MyungSook,
Kim JooHong,
Kim HyeongGyu
Publication year - 2021
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2021gl093990
Subject(s) - teleconnection , climatology , advection , east asia , environmental science , heat wave , atmospheric sciences , geology , geography , oceanography , el niño southern oscillation , climate change , physics , archaeology , china , thermodynamics
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 ( T max > 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.