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East Asian heatwaves driven by Arctic-Siberian warming
Jeong-Hun Kim1,2, Seong-Joong Kim3, Joo-Hong Kim2
1Department of Atmospheric Sciences, Kongju National University, Gongju, 32588, Republic of Korea.
Scientific Reports
|October 27, 2022
Summary
East Asian heatwaves are influenced by global warming and Arctic-Siberian Plain (ASP) teleconnections. Understanding ASP
Area of Science:
- Atmospheric Science
- Climate Science
- Meteorology
Background:
- East Asian heatwaves (EAHWs) exhibit variability influenced by long-term trends and interannual patterns.
- Global warming contributes to externally forced EAHWs.
- Interannual variability is linked to circumglobal teleconnection (CGT) and Arctic-Siberian Plain (ASP) teleconnection patterns.
Purpose of the Study:
- To investigate the contributing factors of East Asian heatwaves (EAHWs) linked to the Arctic-Siberian Plain (ASP).
- To analyze the influence of Rossby wave energy propagation from the ASP on EAHWs.
- To explore the role of land-atmosphere interactions in the ASP on heatwave amplification.
Main Methods:
- Analysis of EAHWs over 42 years (1979-2020).
- Investigation of teleconnection patterns, including CGT and ASP.
- Examination of Rossby wave energy propagation and upper troposphere dynamics.
- Assessment of land-atmosphere interactions, including surface radiative heating, evaporation, and water vapor feedback.
Main Results:
- Rossby wave energy from the ASP propagates to East Asia, amplifying EAHWs.
- Stationary high pressure in the ASP is generated by upper troposphere vorticity advection.
- Enhanced surface radiative heating and evaporation on the ASP amplify thermal high pressure via water vapor feedback.
- Land-atmosphere interactions in the ASP during summer lead to EAHWs through Rossby wave energy propagation.
Conclusions:
- Enhanced understanding of ASP teleconnection improves EAHW forecasting on sub-seasonal timescales.
- Findings contribute to better future projections of EAHWs in global climate models.
- The study highlights the significant role of the ASP in modulating East Asian climate.
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