Japan Geoscience Union Meeting 2022

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[E] Poster

A (Atmospheric and Hydrospheric Sciences ) » A-CG Complex & General

[A-CG35] Multi-scale ocean-atmosphere interaction in the tropics

Thu. Jun 2, 2022 11:00 AM - 1:00 PM Online Poster Zoom Room (12) (Ch.12)

convener:Tomoki Tozuka(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), convener:Ingo Richter(JAMSTEC Japan Agency for Marine-Earth Science and Technology), Yukiko Imada(Meteorological Research Institute, Japan Meteorological Agency), convener:Masamichi Ohba(Central Research Institute of Electric Power Industry), Chairperson:Tomoki Tozuka(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo)

11:00 AM - 1:00 PM

[ACG35-P04] Impact of tropical instability waves on large-scale atmospheric circulation

*Yukiko Imada1, Hiroyuki Tsujino1, Goro Yamanaka1, Shogo Urakawa1 (1.Meteorological Research Institute, Japan Meteorological Agency)

Keywords:Earth system model, eddy resolving ocean general circulation model, tropical instability waves

Climatic impacts of tropical instability waves (TIWs) on the large-scale atmosphere circulation are investigated using an earth system model MRI-ESM1 where a high-resolution tropical ocean model is nested. It is known that, due to the realistic representation of tropical instability waves (TIWs), the simulated eddy heat flux in the ocean improves tropical oceanic mean states. On the other hand, the impacts of eddy-scale atmospheric responses on atmospheric mean states have not been understood so far. In this study, by conducting two kinds of sensitive experiments based on the nested version MRI-ESM1, it is revealed that atmospheric eddy fluxes converge into the northern off-equator and shift the intertropical convergence zone (ITCZ) northward.