[대기] [8.19] 특별세미나 안내 (박민규 박사, Princeton University & GFDL/NOAA)
일시 : 2025-08-19(화) 16:00 ~ 17:00
연사 : 박민규 박사
소속 : Princeton University & GFDL/NOAA
문의 :
장소 : 501동 504호 세미나실
Title: Mechanistic Understanding of Dynamic Processes in North American Heatwaves
[Abstract]
[Abstract]
The year 2024 was recorded as the warmest year in the 175-year observational record, marking a 1.5°C increase in global mean surface temperature compared to the pre-industrial level. While many studies have examined how a mean shift in the temperature distribution increases temperature extremes, fewer have focused on temperature anomalies after removing the mean warming effect, particularly at regional scales.
In this seminar, I present my recent studies on North American summer heatwaves and associated atmospheric processes simulated by the SPEAR model. In the first study, focusing on western North America (WNA), we find that the occurrences of WNA heatwaves exhibit the following common features: (1) a Rossby wave train originating from the western North Pacific, (2) poleward moisture transport toward the Gulf of Alaska, occasionally via atmospheric rivers, and (3) downstream ridge amplification over WNA. In the second study, we show that North American heatwaves exhibit three regional hotspots (western, central, and eastern) with distinct characteristics. Central NA heatwaves are primarily associated with circumglobal k=5 pattern, whereas western and eastern NA heatwaves are also strongly affected by planetary-scale waves. The SPEAR-MED large ensemble successfully reproduces the observed contributions of different zonal wavenumber circulation anomalies to the occurrence of North American heatwaves, suggesting that these relationships between circulation anomalies and heatwaves is generalizable.
첨부파일 (1개)
- 초록(박민규교수)_20250819.pdf (7 KB, download:15)
