Climate simulations using an earth system model incorporating a high-resolution tropical ocean nesting model

Yukiko Imada; Goro Yamanaka; Hiroyuki Tsujino; Shogo Urakawa; Yasushi Takatsuki

Presentation information

[JJ] Oral

A (Atmospheric and Hydrospheric Sciences) » A-OS Ocean Sciences & Ocean Environment

[A-OS15] Dynamics of oceanic and atmospheric waves, vortices, and circulations

Sun. May 20, 2018 9:00 AM - 10:30 AM 105 (1F International Conference Hall, Makuhari Messe)

convener:Ryo Furue(APL/JAMSTEC), Yuki Tanaka(Graduate School of Science, The University of Tokyo), Yukiharu Hisaki(琉球大学, 共同), Norihiko Sugimoto(Keio University, Department of Physics), Chairperson:Sugimoto Norihiko, Furue Ryo

9:30 AM - 9:45 AM

[AOS15-03] Climate simulations using an earth system model incorporating a high-resolution tropical ocean nesting model

★Invited Papers

*Yukiko Imada¹, Goro Yamanaka¹, Hiroyuki Tsujino¹, Shogo Urakawa¹, Yasushi Takatsuki¹ (1.Meteorological Research Institute, Japan Meteorological Agency)

Keywords:Tropical Instability Waves, ENSO, Earth System Model, High-resolution tropical ocean nesting model

Climatic impacts of mesoscale eddies in the tropical oceans on the oceanic mean states, atmospheric circulation, ENSO, and other natural variabilities are investigated using an earth system model MRI-ESM1 where a high-resolution tropical ocean model is nested. Because of the realistic representation of tropical instability waves (TIWs), the simulated eddy heat flux improves not only tropical oceanic mean states but also spatial distributions of mean surface wind stress and precipitation in the nested version of MRI-ESM1. ENSO characteristics (amplitude, period, spatial pattern, teleconnection) are also modified through the changes of mean state. Interestingly, nonlinear eddy heat transports due to TIWs increase the ENSO skewness and improve the characteristics of ENSO nonlinearity.