11:30 〜 11:45
[AAS07-10] Microphysics dependency on the reproducibility of the MJO in the DYAMOND winter phase experiment on NICAM
★Invited Papers
キーワード：DYAMOND 、マッデン・ジュリアン振動、非静力学正20面体格子大気モデル
As part of participating in the DYAMOND (DYnamics of the Atmospheric general circulation Modeled On Non-hydrostatic Domains) winter phase model intercomparison project, we conducted a set of 40-days integrations on a convection-permitting model, NICAM (Nonhydrostatic ICosahedral Atmospheric Model) at 3.5 km horizontal resolution and 78 vertical layers using Fugaku. The simulations were done in two different microphysics settings, one optimized for the reproducibility of the MJO (MJO-tuned) in subseasonal integrations, and another optimized for high resolution model intercomparison project (High Res MIP)-type experiments.
In this study, we examined the microphysics dependency of the reproducibility of an MJO event from late January 2020 to mid February 2020, which was included in the integration period. The comparison of the two simulation results revealed that both settings successfully reproduce the eastward movement of convective system of the MJO to the dateline in the first 20 days of the integration. However, past 20 days of the integration, convective activities were maintained near the date-line, as in the observation, only for the MJO-tuned setting. The preliminary analyses on the simulation results indicate that the differences in the two settings arise from the contrasts in the type of convective systems that compose the simulated MJOs. A discussion on the physical interpretation of these differences will be given from the mean states that are achieved by the two model settings.
In this study, we examined the microphysics dependency of the reproducibility of an MJO event from late January 2020 to mid February 2020, which was included in the integration period. The comparison of the two simulation results revealed that both settings successfully reproduce the eastward movement of convective system of the MJO to the dateline in the first 20 days of the integration. However, past 20 days of the integration, convective activities were maintained near the date-line, as in the observation, only for the MJO-tuned setting. The preliminary analyses on the simulation results indicate that the differences in the two settings arise from the contrasts in the type of convective systems that compose the simulated MJOs. A discussion on the physical interpretation of these differences will be given from the mean states that are achieved by the two model settings.