[P-EM16] Coupling Processes in the Atmosphere-Ionosphere System

9:15 〜 9:30

[PEM16-14] Intense Gravity Waves Observed by AWE Over the Korean Peninsula Associated With the 2024 Severe Winter Storm in Japan

*Masaru Kogure¹、In-Sun Song¹、Hosik Kam² (1.Yonsei University、2.Korea Astronomy and Space Science Institute)

キーワード：

Gravity wave、Heavy Snow、Atmospheric Waves Experiment、Japan Sea Polar air mass Convergence Zone (JPCZ)

Gravity waves (GWs) are generated by meteorological disturbances, propagate upward, transport momentum and energy, and drive the meridional circulation in the middle atmosphere. While many studies have emphasized GW generation by deep convection driven by strong solar heating in lower and summer middle latitudes, wintertime convection at mid and high latitudes has received less attention because convective available potential energy (CAPE) is typically low. Recently, Kogure et al. (2024) demonstrated, using SD-WACCM-X/SAMI3 simulations, that convection within extratropical cyclones can generate concentric gravity waves that reach the thermosphere and ionosphere and drive the medium-scale traveling ionospheric disturbances (MSTIDs) by using a numerical simulation SD WACCM-X/SAMI3. In addition, Kogure et al. (2025) statistically showed that concentric MSTIDs accompanied by concentric stratospheric GWs are frequently observed in regions of high extratropical cyclone activity during winter. This study investigates an intense mesospheric GW event over the Korean Peninsula on 24 January 2024, when a winter storm produced heavy snowfall in northwestern Japan. These GWs were observed by the Atmospheric Waves Experiment (AWE) onboard the International Space Station (ISS). Our ray tracing analysis shows that those mesospheric GWs likely originated over the Japan (East) Sea, where Himawari-9 and Japan’s meteorological radar network captured high cloud tops. We will present the observation results together with meteor-radar measurements and a Weather Research and Forecast (WRF) simulation. The talk will discuss a potential relation between the mesospheric GWs, the heavy snowfall, and the winter weather pattern, i.e., the Japan Sea Polar air mass Convergence Zone (JPCZ).
This research was supported by Global – Learning & Academic research institution for Master's PhD students, and Postdocs (LAMP) Program of the National Research Foundation of Korea (NRF) grant funded by the Ministry of Education (no. RS-2024-00442483).