Atmospheric tidal variabilities during ENSO

2023 Fiscal Year Final Research Report

• Project/Area Number: 17KK0095
• Research Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research)
• Allocation Type: Multi-year Fund
• Research Field: Space and upper atmospheric physics
• Research Institution: Kyushu University
• Principal Investigator: Liu Huixin 九州大学, 理学研究院, 教授 (70589639)
• Project Period (FY): 2018 – 2023
• Keywords: 大気圏・電離圏結合 / エルニーニョ / 大気潮汐 / オゾン / 大気波動

Outline of Final Research Achievements

The El Nino-Southern Oscillation (ENSO), an interaction phenomenon between the troposphere and the ocean, has been found to affect the upper atmospheric region from 100 km to 1000 km altitude through long-term satellite observations and is a research topic of significant interest. In this study, we investigate the mechanism of the terrestrial connection by quantifying the radiative and latent heat variations associated with changes in water vapor due to rainfall during ENSO using numerical simulations, and clarify the causes of atmospheric tidal wave fluctuations. The coupling process from sea level to the upper atmosphere in El Nino climate change is clarified, which is expected to improve space weather prediction in the ionosphere and to lead to new developments in the overall atmospheric vertical coupling study.

Free Research Field

超高層大気物理

Academic Significance and Societal Importance of the Research Achievements

本国際共同研究では、世界に先駆けて、ENSOによる超高層大気変動の生成機構の解明を目指している。最先端大気モデルを駆使した数値シミュレーションによって、まだ研究が行われてないENSOに伴う電離圏熱圏変動観測のギャップを埋め、上下大気結合力学過程が明らかになるものと期待される。本研究により大気中の結合過程の全球描像を得ることで、この地球環境研究における新しい分野の構築と発展を促し、その成果は宇宙天気予測の向上に繋がればと考えている。